;`hj! !0 @@@ @@@@J,Dyc!!@ EN DB !P4 ',B[ AkChoueiry1996$Floriani1999D1 Gorls1999x Kibala1991`7 Lemenovskii1987-3 Negishi1984. Pindado1999& Rousset199187 Thewalt1988e @Љ|6D Thewalt19937 Thewalt1995? Thewalt1996 Thewalt1996; Thewalt1997 Thewalt1997 Thewalt1997 Thewalt19979 Thewalt1998 Thewalt1998 Thewalt1998 Thewalt19985 Thewalt19996 Thewalt1999 Thewalt1999 Thewalt1999 Thewalt2000 Thewalt2000 Thiele2000g Thiele2000 Thomas1997 Thomas19979 Thomas1998 Thomas2000=Thompson19866Thompson1992n Thorman2000f Thornton-Pett1998 Thornton-Pett1998 Thornton-Pett2000 Thorntonpett1984 Thorntonpett1985 ThorntonPett1997 ThorntonPett1997 ThorntonPett1997 Tian19999! Tian20000$Tikkanen1999r^Tikkanen1999 Tillack1994 Tillack1995 Tillack1995 Tillack1995 Tillack1996 Tillack1996 Tillack1996 Tillack1996 Tillack1997( Tilley19899* Tilley19966Q Tinkham1988R Tinkham1988B Tio1999B Tiripicchio1991+ Tiripicchio1995 Tislerova2000  Tomaszewski2000e Toraman1999v Toupet19911 Tour19858. Trakarnpruk1995HTraverso19977Traverso19999| Treschanke1982V$ Triller1999Tripathi2000$ Tripepi1996 Tritto2000 Trobajo2000 Troll2000Troyanov1981Troyanov19868Troyanov19868Troyanov1986Troyanov1986\Troyanov19879Troyanov1988Troyanov1989aTroyanov1989Troyanov1990Troyanov1990fTroyanov1992Troyanov19949Troyanov1994Troyanov1996Troyanov1998Troyanov1998Troyanov19999Troyanov1999Troyanov2000Troyanov2000 Trubitsin2000#Trzeciak1996 Tsai2000 Tsirelnikov1986 Tsirelnikov1986 Tsirelnikov1987 Tsubaki2000! Tsvetkova2000 Tsyrelnikov1981m Tudoret1996 Tunge2000*Turculet19988 Turner20000w Twyman19919Z Ueyama20000Umakoshi2000 Unger2001 Uozumi2000 Ura2000 Ura2000{ Ura2001g Urazovskii1987` Urazowski1989M Ushioda19964 Ushioda1998o Uson1995 Valente1980z van den Hende2001van der Linden2000Vvan der Zeijden1993van der Zeijden19939van der Zeijden1997Evan der Zeijden1997ivan der Zeijden1997[van der Zeijden2000p Vanbeek1995  Vanbolhuis1988 Vanhorn1981 Vanhorn19832 Vanlenthe1991E Varga1992? Varga1996# Varga1996 Varga1996  Varga1997! Varga19979 Varga1998: Varret19922Vathauer2000 Vedel1985' Veksler19983 Vernooijs1993 Vicart1999 Vidal2000$Villalta1999r^Villalta1999 Villasenor20010z Visser2001 Vlassov2000 Vogel1982 Voigt2000  Vollmerhaus2000E Vondrak1992 Voskoboynikov2001 Wailes1965e Wailes1971. Waldman19950 Waldmuller1989 Walker1989 Walker19899} Walker19909t Walker19911x Walker1991k Walker19922l Walker19929o Walker19929 Wallstein1923 Walters2000> Walther1996@ Walther1996= Walther19974 Walther19997 Walther19993 Walther2000m Wang1996D Wang1997c Wang19988 Wang2000 Wang20000 Wang20000 Wang20000 Wang2000Warnecke1997S Warren19969 Warren1998 Warren20000 Wass19999ZWatanabe2000Watanabe2000c Watt1970T Waugh1996M Waugh1997N Waugh1997Waymouth2000Waymouth2000Waymouth2001Y Webb19933 Wee2000 Weeber2001H Weidenbruch1998e Weigold1971> Weiss1996 Wells1981} Wells1981 Wengrovius1981 Wengrovius1981 Werner200006 Wessel19958 Wessel1995 Whang1997 Whitby1999 White1984# White1984' White1987 White1997 Wibbeling2000 Wibbeling2000 Wibbeling2001 Wicher1980w Wicher1982 Wielstra1988Wielstra1988Wielstra1989Wielstra1989Wielstra1989Wielstra1989Wielstra1989Wielstra1989Wielstra1990Wielstra1990Wielstra1990Wielstra1990Wielstra1991 Wigum20006 Wilcock1993 Wilen2001 Wilkinson1953 Wilkinson1984 Wilkinson1985@ Wilkinson1995* Willey1967+ Willey1968_Williams19999Williams2000  Wingbermuhle1993 Winter1989  Winter1991 Winter1991 Winter19949 Winter19979l Winterborn1984' Winterborn1987 Winterborn1989 Wipf2000w Wiseman1991# Witte1996 Witte1998 Wloka1998 Wloka1999 Wloka2000@ Wocadlo1989$ Wocadlo1999 Wocadlo1999Wojcicki2000Wojtczak1990Wojtczak1991Wojtczak1991Wojtczak1991Wojtczak1992Wojtczak1993Wojtczak1994Wojtczak1994Wojtczak1994Wojtczak1994Wojtczak1995Wojtczak1996Wojtczak1996Wojtczak1997 Wolczanski1982 Wolf2000 Wolmershauser1994j Wong199215 Wong19965 Wong19966 Woo2000 Woo2000Y Wrackmeyer1993 Wu1995C Wurst1991 Xi1995 Xi1997h Xi1998h Xi1998h Xiao2000 Xie2001e Xin1998 Xin2000d Xu200005 Xue1996 Yamada2000?Yamazaki1998IYamazaki19988Yamazaki1999M Yan1996B Yan19974 Yan1998 Yan2000 Yang20000 Yano2000/ Yarrow198110 Yarrow19811 Yasin2000 Yasuda2000  Yin1993Yonemoto2000 Yoon2000 Yoshida1981 Yoshida1981 Yoshida1983 Yoshida2000I Yoshimura1998 Young1997[ Young1997 Young2000 Ystenes2000 Yu1997 Yuchi2000 Yuen19966 Yun20009 Zaegel19947 Zaegel199593 Zaegel19989= Zahn19977 Zaima2000 Zak1994Zambelli19949Zambelli20011wZanotti-Gerosa19980 Zaworotko19812 Zaworotko1993_ Zaworotko1993\ Zaworotko1996] Zaworotko1996V Zaworotko1999X Zaworotko1999 Zemanek2000 Zhai20000 Zhai20000 Zhang19895 Zhang1996Y Zhang2000 Zhang2000 Zhang2000 Zhang2000 Zhang2000 Zhang2000 Zhang2000 Zhang2000 Zhang2000 Zhao2000 Zhao20000 Zhou19898 Zhou19911 Zhou19919 Zhou19941 Zhu1992 Zhu1993 Zhu1995 Zhu2000 Zhu2000 Zhu2000. Ziegler1995; Ziller1992< Ziller1992 Ziller20000# Ziotkowski19969 Zippel19979: Zsolnai1992 Zucchi200092 Zucchi2000 Yoshida1983 Yuen19966 Yuen19966 Yuen19966! Yuen19966A Yuen19966 Yuen19966 Yuen19966I Yuen19966= Zahn19977~ Zahn19977 Zahn19977> Zahn19977wZanotti-Gerosa1998Zanotti-Gerosa19987Zanotti-Gerosa19980 Zaworotko1981_ Zaworotko1981 Zaworotko1981 Zaworotko1981 Zaworotko1981rotko1981eFR@k6#cI9WPb+4ja:tN C"&S!H3O_qJ]5^|f;ro)>\}XhgT0K%EzeM~lVs1 (GLu= ?xQ Authorsy Journals U Keywords/Yl                               *p! x :XY, Zr 1 A, X. Y.A. Tiripicchio4.A.A.H.van der Zeijden, C. Mattheis R. Frohlich<8A.A.H.van der Zeijden, C. Mattheis R. Frohlich F. Zippel A.H.WhiteTOA.Herzog, Feng-Quan Liu H. W. Roesky A. Demsar K. Keller M. Noltemeyer F. Pauer0*A.Herzog, H. W. Roesky F. Jager A. Steiner0+A.Herzog, H. W. Roesky Z. Zak M. Noltemeyer A.Martin, M. Mena F. Palacios Abboud, K. A. Abel, E. W.Agarkov, A. Y. Agreda, T. C. Ahn, C. H. Aida, T. Aitola, E. T. Aizenberg, M. Akimoto, A. Al-Ahmad, S. Al-Juaid, S.Aladyshev, A. M. AlAhmad, S. Albers, T. Albinati, A. Albrecht, M.Albright, T. A. Alcock, N. W. Ali, M. A. Alt, H. Alt, H. G.Amendola, A. G. Amor, F. Amor, J. I. Anastasia, L.Andersen, R. A.Anderson, H. U. Angermund, K. Ansari, M. A. Anson, C. E. Antinolo, A.Antipin, M. Y.Antonelli, D. M.Antropiusova, H. Aoyagi, K. Arevalo, S. Arif, A. M. Armes, S. P.Armstrong, D. R. Arndt, P. Arnold, F. P. Arnold, J. Arnold, P. Asao, N. Ashe, A. J.Ashworth, T. V. Astruc, D.Atovmayn, L. O. Atwood, J. L. Avent, A. G. Azahari, K.Babaiankibala, E. Babel, A. I.Babkina, O. N. Babock, J. R.Baerends, E. J. Bagrov, V. V. Bai, G. C. Baird, M. C. Baker, R. W. Balboni, D. Bandy, J. A.Bandyopadhyay, S. K. Barat, P. Barlow, S. Baruzzi, G. Basch, H. Bashkin, J. Basile, F. Basset, J. M. Bastug, T. Bates, G. S. Baum, E. Baumann, R. Baumann, W. Bayard, F. Bazan, G. Bazan, G. C.Bazhenova, T. A. Beckhaus, B. Beckman, O. Behrens, U.Beletskaya, I. P.Bellabarba, R. M.Beltran-Porter, D. Benard, M. Benech, J. M. Benetollo, F. Benito, J. M. Benn, R.Benning, M. M. Bensch, W. Bensimon, C. Bercaw, J. E.Berdonosov, S. S.Berestetskaya, I. V.Berezovskii, G. A. Berg, K. Bergander, K.Bergman, R. G.Bergstrom, C. H. Berhalter, K. Berke, H.Berlitz, T. F. Berrondo, M. Bigorne, M.Billodeaux, D. R. Binet, C.Birmingham, J. M.Birmingham, J.M.  UCD?15-Crown-5 diaqua-trichloro-(eta$5!-cyclopentadienyl)-zirconiumYTOAbstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc.441Accounts of Chemical Research Accounts Chem. Res.xrActa Crystallographica Section C-Crystal Structure Communications Acta Crystallogr. Sect. C-Cryst. Struct. Commun.@Adv. Organomet. Chem.<9Advanced Organometallic Chemistry Adv. Organomet. Chem. $ Analytical Chemistry Anal. Chem.Angew.Chem.,Int.Ed.Engl.HBAngewandte Chemie-International Edition Angew. Chem., Int. Edit. XSAngewandte Chemie-International Edition in English Angew. Chem., Int. Edit. Engl. 4/Applied Catalysis a-General Appl. Catal. A-Gen.<7Applied Organometallic Chemistry Appl. Organomet. Chem.+PLBulletin of the Academy of Sciences of the Ussr Division of Chemical ScienceD?Bulletin of the Chemical Society of Japan Bull. Chem. Soc. Jpn.D?Bulletin of the Korean Chemical Society Bull. Korean Chem. Soc.LHCanadian Journal of Chemistry-Revue Canadienne De Chimie Can. J. Chem. R0+Catalyst Design for Tailor-Made Polyolefins Chem.Commun.(%Chemical Communications Chem. Commun.0*Chemical Physics Letters Chem. Phys. Lett.1D@Chemical Research in Chinese Universities Chem. Res. Chin. Univ. Chemical Reviews Chem. Rev.g,(Chemical Society Reviews Chem. Soc. Rev.$!Chemische Berichte Chem. Berichte0+Chemische Berichte-Recueil Chem. Ber.-Recl. Chemistry Letters Chem. Lett.$!Chemistry of Materials Chem. Mat.0*Chemistry-a European Journal Chem.-Eur. J.)0*Chinese Chemical Letters Chin. Chem. Lett.<8Chinese Journal of Organic Chemistry Chin. J. Org. Chem.Chirality ChiralityTPCollection of Czechoslovak Chemical Communications Collect. Czech. Chem. Commun.Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule B- Mecanique Physique Chimie Astronomie Comptes Rendus Acad. Sci. Ser. II-B83Computational Materials Science Comput. Mater. Sci.40Coordination Chemistry Reviews Coord. Chem. Rev.0*Current Organic Chemistry Curr. Org. Chem.1@>;5G 9z#6"OjC E%%C)CH0MQQo 2 8897-899 "Gambarotta, S. Chiang, M. Y.Synthesis of a Diamagnetic Fulvalene Zirconium(Iii) Derivative - the Crystal-Structure of (Eta-5-Eta-5-C10h8)[(Eta-5- C5h5)Zr(Mu-Cl)]2Organometallics Organometallics 19876 4RAPR ORGANOMETALLICSISI:A1987G901100040U"Gambarotta, S. Chiang, M. Y. 1987The Synthesis and X-ray Structure of Chloro-(eta$5!-cyclopentadienyl)-bis(bis(dimethylphosphino)ethane-P,P')-zirconium via the Reduction of CpZrCl3iChemical Communicationsz 698a FERZEH86-INOR."Gambarotta, S. Chiang, M. Y.RLMetal Metal Bond Formation in the Chemistry of Zr(Iii) - a Chemical Approach:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1988 195c&JUN 5 1 ABSTR PAP AMER CHEM SOCISI:A1988P599102691r j T`.~ 5030-5040voHylakryspin, I. Waldman, T. E. Melendez, E. Trakarnpruk, W. Arif, A. M. Ziegler, M. L. Ernst, R. D. Gleiter, R.1Pentadienyl as a Stronger Binding but More Reactive Ligand Than Cyclopentadienyl - Syntheses, Reactions, and Molecular-Orbital Studies of Half-Open Titanocenes OrganometallicsEMETAL PHOSPHINE CHEMISTRY; EFFECTIVE CORE POTENTIALS; CARBON- MONOXIDE; SUBSTITUTION-REACTIONS; OPEN METALLOCENES; DIENYL COMPLEXES; OPEN VANADOCENES; ADDUCTS; MOLYBDENUM; ISOMERIZATIONRThe reactions of Ti(C5H5)Cl-2(PR(3)) complexes (R = Me, Et) with 2 equiv of a potassium pentadienide such as KC5H7 or K(2,4-C7H11) (C7H11 = dimethylpentadienyl) lead to the formation of diamagnetic 16 electron half-open titanocenes as monophosphine adducts. A single-crystal X-ray diffraction study of Ti(C5H5)(2,4-C7H11)(PEt(3)) revealed that the Ti-C bond lengths for the open dienyl ligand were much shorter than those for the C5H5 ligand, 2.240(3) vs 2.346(4) Angstrom, indicative of stronger Ti-C7H11 bonding. Reaction of this complex with CH3CN leads to loss of the PEt(3) ligand and coupling to the 2,4-C7H11 ligand. Thus, the C7H11 ligand is not only more strongly bound than C5H5, it is also more reactive. A structural determination of this complex confirmed the mode of coupling and revealed that a dimeric species was formed. The phosphine ligands in the various complexes may readily be replaced by P(OMe)(3) or P(OEt)(3). The Ti(C5H5)(2,4- C7H11)(PEt(3)) complex also reacts with CO, leading to a thermally unstable monocarbonyl and a thermally unstable dicarbonyl. While spectroscopic data revealed a symmetric structure for the monocarbonyl, the dicarbonyl complex is clearly unsymmetric. Molecular orbital calculations provide confirmation of stronger titanium-pentadienyl bonding and also the fact that the pentadienyl ligands serve as much better electron accepters than cyclopentadienyl. To a large extent these may both be attributed to significant delta bonding interactions between titanium d(xy) and pentadienyl pi(4)* orbitals.Organometallics 19951411NOV ORGANOMETALLICSISI:A1995TE43400023825-830L"Isobe, T. Murai, T. Mae, Y.Electrochemical roles of precipitates on uniform corrosion and hydrogen pickup of zirconium alloys, (II) - Roles on hydrogen pickupa4-Journal of the Atomic Energy Society of JapanJ. At. Energy Soc. Jpn.p 2000428AUG J ATOM ENERG SOC JPNISI:000089652000011Issleib, K., Hackert, H. 1966Z. Naturforsch. B21 519 1423-1428D=Jacobsen, H. Brackemeyer, T. Berke, H. Erker, G. Frohlich, R.<5Coordination chemistry of {[Zr]-Cl-[Zr]}(+) complexes.'European Journal of Inorganic ChemistryEur. J. Inorg. Chem. 20007 JUL EUR J INORG CHEMISI:000088112600005925-930C^XJamieson, J. Y. Schrock, R. R. Davis, W. M. Bonitatebus, P. J. Zhu, S. S. Hoveyda, A. H.ySynthesis of molybdenum imido alkylidene complexes containing N,N '-disubstituted 2,2 '-bisamido-1,1 '-binaphthyl ligands-OrganometallicsOrganometallicst 2000195HMAR 6 ORGANOMETALLICSRISI:0000858112000280316-324M2+Janiak, C. Lange, K. C. H. Scharmann, T. G.,Zirconium-chelate and mons-eta-cyclopentadienyl zirconium- chelate/methylalumoxane systems as soluble Ziegler-Natta olefin polymerization catalysts& Applied Organometallic ChemistryAppl. Organomet. Chem. 20001467 JUN APPL ORGANOMETAL CHEM3ISI:000087530800003IcesZ.Naturforsch.(B)n 19833811Z NATURFORSCH SECT BISI:A1983RT07200030303-313R*#Thewalt, U. Klima, S. Berhalter, K.UCyclic Trinuclear Zirconium Complex with Penta-Coordinated Central Atoms - Preparation and Structure of Tris[(Di-Pi- Cyclopentadienyl)(Mu-Terephthalato)Zirconium(Iv)]- Dichloromethane(1/1)*#Journal of Organometallic ChemistrytJ. Organomet. Chem.u 1988 342t3a MAR 22 J ORGANOMETAL CHEMeISI:A1988M684300004l>j 1583-1585o(!Eisch, J. J. Owuor, F. A. Shi, X. Organic chemistry of subvalent transition metal complexes part 17 - Novel synthesis of unbridged, sterically substituted zirconocene dichlorides from fulvenes and dialkylzirconium dichlorides via zirconium(IV) hydride transferOrganometallicsOrganometallics 1999189APR 26 ORGANOMETALLICSISI:000080072500005127-133.LFEkholm, P. Lehmus, P. Kokko, E. Haukka, M. Seppala, J. V. Wilen, C. E.Synthesis and characterization of a silyl substituted bis(Indenyl) zirconium dichloride and comparison of its olefin polymerization behavior to a siloxy substituted analogue :3Journal of Polymer Science Part a-Polymer ChemistryRmetallocene; ansa-zirconocene; idenyl; heteroatom; siloxy; silyl; alpha-olefin polymerization PROPYLENE POLYMERIZATION; METALLOCENE CATALYSTS; ETHYLENE; ZIRCONOCENE; TERMINATIONzThe synthesis and characterization of rac-[ethylenebis(1-(tert- butyldimethylsilyl)-3-indenyl)] zirconium dichloride (3) is reported. The silyl substituted 3/MAO was compared to its siloxy substituted analogue (4) in ethylene homo- and in ethylene-1-hexene copolymerizations to elucidate the effect of the heteroatom on polymerization performance. The influence of monomer and cocatalyst concentration and the polymerization temperature was investigated. The oxygen between the indenyl ligand and the bulky tert-butyldimethylsilyl group in the siloxy substituted 4/MAO was found to have a positive influence on polymerization activity and copolymerization performance. (C) 2000 John Wiley & Sons, Inc. J. Polym. Sci. Pol. Chem. 2001391$JAN 1 J POLYM SCI A-POLYM CHEMISI:000165868900014 1048-1057D0)Ellis, J. E. Frerichs, S. R. Stein, B. K.THighly Reduced Organometallics .32. Cyclopentadienyl- Substituted and Pentamethylcyclopentadienyl-Substituted Heptacarbonyls of Zerovalent Titanium, Zirconium, and Hafnium, [(C5r5)M(Co)4]-, and Derivatives ThereofOrganometallicsOrganometallics 1993124APR ORGANOMETALLICSISI:A1993KX23300020283-286$Ellis, J. E. Yuen, P. Jang, M.New classes of zerovalent zirconium carbonyls and related species. Structural characterizations of [Zr(CO)(5)(SnMe(3))(2)](2-) and [Zr(CO)(4)(dppe) SnMe(3)](-), dppe=Ph(2)PCH(2)CH(2)PPh(2)*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1996 507 1-2 JAN 25 J ORGANOMETAL CHEMISI:A1996TR92000035 bVTjNFQ488L 3203-3209 .'Corey, J. Y. Huhmann, J. L. Rath, N. P.oIsolation and Structural Characterization of Cis-Forms and Trans-Forms of [(Eta(5)-C(5)Me(5))Ticl2](2)[Mu-Eta(5)-Eta(5)- (C5h3)(2)(Sime(2))(2)]PInorganic Chemistrym Inorg. Chem. 19953412JUN 7 INORG CHEMISI:A1995RC42400011E565-567V6/Corey, J. Y. Zhu, X. H. Brammer, L. Rath, N. P.Zirconocene DichlorideHAActa Crystallographica Section C-Crystal Structure Communications)60Acta Crystallogr. Sect. C-Cryst. Struct. Commun. 199551,%APR 15 4 ACTA CRYSTALLOGR C-CRYST STRISI:A1995QZ66200009 75-91D Corey, J. Y. Rooney, S. M.nhReactions of symmetrical and unsymmetrical disilanes in the presence of Cp(2)MCl(2)/(n)BuLi (M=Ti,Zr,Hf)*#Journal of Organometallic ChemistryaJ. Organomet. Chem.l 1996 5219 1-26 AUG 23 J ORGANOMETAL CHEMCISI:A1996VG42500011V 2323-2324RKCorradi, M. M. Frankland, A. D. Hitchcock, P. Lappert, M. F. Lawless, G. A.ZSSynthesis, structure and reactivity of [Yb(eta- C(5)Me(5)){Si(SiMe(3))(3)}(thf)(2)]Chemical Communicationsr Chem. Commun.a 199620OCT 21 CHEM COMMUNISI:A1996VP46700009Corradi, M. M. 1997 University of Sussex D.Phil203-204 @9Corradi, M. M. Duncalf, D. J. Lawless, G. A. Waugh, M. P.RKThe synthesis and structure of [Zr(eta-C5H5)(2)(eta(2)- C(5)H(3)Bu(2)(t))X]Chemical Communicationsy Chem. Commun.7 19972MJAN 21 CHEM COMMUNISI:A1997WG497000306 1150-1159eTMCorradi, M. M. Pindado, G. J. Sarsfield, M. J. Thornton-Pett, M. Bochmann, M.Synthesis, fluxionality, and propene insertion reactions of zirconium boryldiene complexes with sterically undemanding Cp ligands0OrganometallicsTOrganometallics7 2000196:MAR 20 ORGANOMETALLICSISI:000086082900028369-INOR"Cotton, F. A. Kibala, P. A.WSynthesis and Structural Characterization of a New Type of Metal-Olefin Complex - Reactions of M-M Bonded Dinuclear Zirconium(Iii) Complexes with Vicinal Dihaloalkanes and Olefinst:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1987 1944$AUG 30 ABSTR PAP AMER CHEM SOCISI:A1987J291202358E799-804.0*Cotton, F. A. Diebold, M. P. Kibala, P. A.Synthesis and Structural Characterization of 3 Compounds with Zr(Iii)-Zr(Iii) Bonds - Zr2cl6(Dppe)2.2c2h4cl2.1.5c6h5ch3,Zr2cl6(Pme2ph)4, and Zr2cl6(Pet3)4Inorganic Chemistry Inorg. Chem. 19882751MAR 9 INORG CHEMISI:A1988M4922000129 1-3.2+Cotton, F. A. Kibala, P. A. Wojtczak, W. A. LFA Simple Compound Containing the 1st Hafnium(Iii) to Hafnium(Iii) BondInorganica Chimica ActaInorg. Chim. Actau 1990 1771NOV 1 INORG CHIM ACTAHISI:A1990EQ453000013 3670-36750*Cotton, F. A. Shang, M. Y. Wojtczak, W. A.Synthesis and Characterization of Edge-Sharing Bioctahedral Complexes of Zirconium(Iii) and Hafnium(Iii) That Contain Long Metal Metal Single Bonds - Zr2i6(Pme3)4, Hf2i6(Pme2ph)4, and Zr2i6(Pme2ph)4Inorganic Chemistry Inorg. Chem. 19913019SEP 18 INORG CHEMISI:A1991GF76200020 2626-2630S>8Cotton, F. A. Kibala, P. A. Shang, M. Y. Wojtczak, W. A.New Compounds of Zirconium(Ii) and Hafnium(Ii) - Synthesis and X-Ray Crystal-Structures of Novel Dimers of Formula M2x4(Eta-6- C6h5pme2)2(Pme2ph)2OrganometallicsOrganometallicsc 1991108dAUG ORGANOMETALLICSfISI:A1991GA27500023u 1462-1463c2+Cotton, F. A. Kibala, P. A. Wojtczak, W. A.A<5Arenes with Hafnium(Ii) Moieties Bonded to Both Faces-.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.u 1991 113h4FEB 13 J AMER CHEM SOCISI:A1991EX60300084R\P 83-90 .'Kleinschmidt, R. Griebenow, Y. Fink, G. pjStereospecific propylene polymerization using half-sandwich metallocene/MAO systems: a mechanistic insight0)Journal of Molecular Catalysis a-ChemicalJ. Mol. Catal. A-Chem. 2000 157 1-2 JUN 20 J MOL CATAL A-CHEMISI:000087952600011 69-80 &Kloppenburg, L. Petersen, J. L.TStereochemical Influence of the Pentamethylcyclopentadienyl Ligand on the Isocyanide Insertion Reactions of the 1-Sila-3- Hafnacyclobutane Complex, (C(5)Me(5))(C5h5)Hf(Ch(2)Sime(2)Ch(2)) Polyhedron Polyhedron 1995141AJAN POLYHEDRONISI:A1995QC754000063 3548-3556 &Kloppenburg, L. Petersen, J. L.tDouble isocyanide insertion and C,C-coupling reaction of [(C5Me4)SiMe2(N-t-Bu)]ZrMe2. Structural characterization of the two 1,4-diaza-5-zirconacyclopentene ring conformations for [(C5Me4)SiMe2(N-t-Bu)]Zr[N(R)C(Me)=C(Me)N(R)] complexesOrganometallicsOrganometallics 19971615JUL 22 ORGANOMETALLICSISI:A1997XM38800041 68-71 @:Kluwe, K. Thiele, K. H. Sorkau, A. Sisak, A. Neumuller, B.nhSynthesis and properties of heterobimetallic complexes - Crystal structure of [(acac)(3)Zr-OCCo3(CO)(9)]*#Journal of Organometallic ChemistryhJ. Organomet. Chem.r 2000 6041 JUN 5 J ORGANOMET CHEMISI:0000883395000100@Ll~~Q~~ &SxLjj|55VsJ5JJJNG\|qqqqH x T JC~5666!555WtN~HbTWvX&<426-ORGN"Kondakov, D. Y. Negishi, E.\VNovel zirconium-catalyzed enantioselective alkylalumination of monosubstituted alkenes:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1996 212 & AUG 25 2 ABSTR PAP AMER CHEM SOCISI:A1996VB009004250 1577-1578"Kondakov, D. Y. Negishi, E.zsZirconium-catalyzed enantioselective alkylalumination of monosubstituted alkenes proceeding via noncyclic mechanism.(Journal of the American Chemical SocietyJCALKYL ALKENE; DERIVATIVES; STRATEGIES; COMPLEXES; REAGENTS; METHANEJ. Am. Chem. Soc.8 1996 118e6,FEB 14 J AMER CHEM SOCISI:A1996TV70600052 2465-2468PJKool, L. B. Rausch, M. D. Herberhold, M. Alt, H. G. Thewalt, U. Honold, B.JDDiamagnetic Isocyanide Complexes of Titanium, Zirconium, and HafniumOrganometallicsaOrganometallicsP 19865n12DEC ORGANOMETALLICSISI:A1986F451600010 37-45.PJKool, L. B. Rausch, M. D. Alt, H. G. Herberhold, M. Honold, B. Thewalt, U.yPreparation, Characterization and Reactivity of Cp2m(Pme3)2 Complexes (M=Ti,Zr) - the Molecular-Structure of Cp2zr(Pme3)2a*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1987 320i1,FEB 3 J ORGANOMETAL CHEMISI:A1987F931000005f109-119.(!Koppl, A. Babel, A. I. Alt, H. G.-Homopolymerization of ethylene and copolymerization of ethylene and 1-hexene with bridged metallocene/methylaluminoxane catalysts: the influence of the bridging moiety0)Journal of Molecular Catalysis a-Chemicalcopolymerization; metallocene catalysts; supported PHT NUCLEAR MAGNETIC-RESONANCE; METHYLALUMOXANE CATALYST; PROPENE POLYMERIZATION; POLYETHYLENES; DICHLORIDE; BLENDSEthylene and 1-hexene have been copolymerized with the catalyst system 9-fluorenylidene-1-cyclopentadienylidene-2-hex-5- enylidene zirconium dichloride/PHT (PHT = partially hydrolyzed trimethylaluminum). The resultant polymer has been characterized. The product of the copolymerization parameters r(1) . r(2) indicates a statistical distribution of the monomers in the produced poly(ethylene-co-1-hexene). Various ansa-bis(fluorenylidene) and ansa-fluorenylidene cyclopentadienylidene zirconium dichloride complexes have also been used as catalyst precursors to homopolymerize ethylene and copolymerize ethylene and l-hexene heterogeneously. For these reactions, the relationships between "bite-angle", polymerization activity, and comonomer incorporation have been investigated using PHT/silica gel and MAO/silica gel as aluminoxane type cocatalysts. The effect of comonomer on the catalytic activity is generally positive for MAO/silica gel catalysts and negative for PHT/silica gel catalysts. (C) 2000 Elsevier Science B.V. All rights reserved.J. Mol. Catal. A-Chem. 2000 153R 1-2L MAR 10 J MOL CATAL A-CHEMISI:000085905200013 /0 (C5ME5)2SMEST (FTIR)r t11-TAL 1-hexener 1-OCTENEE 18-crown-623 3-BUTADIYNESD5-FIC6 6-TETRAMETHYLPIPERIDIDE LITMP 7-COORDINATE MOLYBDENUM(II)Z$8-C10H6(NR)(2)>TICL2-COCATALYST 91 NMR po<1LYM<1>FERROCENOPHANESӐ(+) CATIONS= 0-4 COMPLEXES = SIME3MEab initio calculationsABINITIO CALCULATIONS ABSTRACTIONOM ACETYLENEacetylene complexesocacids$ACTIVATED METALLOCENE CATALYSTS ACTIVATIONSUC active site p activityeACYCLIC COMPOUNDSADDITIONAL LIGANDSܐ ADDUCTSNA AGGREGATIONIS($AGOSTIC ALKENYLZIRCONOCENE COMPLEXESALIPHATIC-ALDEHYDESTS ALKALIENEALKALI METAL COMPOUNDSnY ALKALI-METALS alkalimetalieALKANE ELIMINATIONSTS ALKENECOMALKENE COMPLEXESOALKENE POLYMERIZATION ALKENESST alkenylumALKENYL COMPLEXYN ALKENYLZIRCONIUM DERIVATIVES ALKOXIDESALKYL ALKYL ALKENEAalkyl anion abstractionYALKYL COMPLEXESCA ALKYL-ALKENEAALKYL-DERIVATIVES0,ALKYLBIS(CYCLOPENTADIENYL)TITANIUM COMPLEXES ALKYLIDENEE CalkylzirconacyclesiYALKYLZIRCONIUM COMPLEXESS ALKYNEZalkyne complexess ALKYNESSC alkynylumALLYLZINCATIONONTALPHA ALPHA-VINALPHA-DIIMINE CATALYSTSDS ALPHA-HYDROGEN ABSTRACTIONIZAALPHA-HYDROXY ESTERSR ALPHA-OLEFINTALPHA-OLEFIN COPOLYMERSES ALPHA-OLEFIN POLYMERIZATIONer ALPHA-OLEFINS ALPHA-SUBUNIT ALTERNATING COPOLYMERIZATIONI ALUMINOXANEXA aluminoxaneso ALUMINUMU ALUMOXANESEXAamideAMIDOAMIDO CATALYSTSDAAMINEAMINE ELIMINATIONANCILLARY LIGANDC ANIONICHY ANIONSC-T ANNULATED CYCLOPENTADIENESZ$ ansa-Bis(tetrahydroindenyl)metalANSA-METALLOCENER ANSA-METALLOCENE CATALYSTS ANSA-METALLOCENE DERIVATIVESansa-metallocenesansa-titanocenessansa-zirconocenecansa-zirconocenesAPICOPHILICITYYIOARENEARENE COMPLEXESZAAROMATIC HALIDESc("ARSENIC-BRIDGED <1>FERROCENOPHANESARYLNARYL COMPOUNDSXES ARYLSILANES CASYMMETRIC CATALYSISLASYMMETRIC EPOXIDATIONDEASYMMETRIC HYDROGENATIONNATOMLATOMSAXIAL CHIRALITYL AZOLIDESAZOTOBACTER-VINELANDIIOR BARIUM3MEBASEF BEHAVIORMBENT METALLOCENEPBENZENE-DERIVATIVESIZ BENZYLORIBENZYL COMPLEXESAbeta-BETA-DIKETINIMATO LIGANDSBETA-UNSATURATED CARBONYLbetaine complextobiaxial orientations. BICYCLIZATIONBINUCLEAR METALLOCENESBIS(CYCLOPENTADIENYL)TIN BIS(INDENYL)O<6BIS(PENTAMETHYLCYCLOPENTADIENYL)(ETHYLENE)TITANIUM(II),'Bis(tetrahydroindenyl)lutetium chloride,&Bis(tetrahydroindenyl)yttrium chloride BLENDSRIDBONDNBOND FORMATION REACTIONSTBOND METATHESIS MECHANISMBONDSBORABENZENE DERIVATIVESAL boratesroboronBORON TRIHALIDESL BORYLATIONS C BRIDGEDBO$!BRIDGED TETRAHYDROINDENYL LIGANDS BRIDGED ZIRCONOCENE CATALYSTS bronstedo BUFFERED PROTIC CONDITIONSLIGBUILDING-BLOCKSDS butadiynesple C BONDEAR C SINGLEO C SINGLE BOND C-C and Si-H bond activationsC-C bond activations. C-C couplingC-HF-C-H activation C-O BOND calciumum calculationsl CARBANIONSSLICARBOALUMINATIONTCARBOMETALATIONMA CARBON BONDLECARBON BOND FORMATION CARBON-VECARBON-CARBON BONDactCARBON-DIOXIDELEXCARBON-MONOXIDECA CARBONYLY CARBONYLATIONCARBORANE LIGANDSCASCADE CARBOALUMINATIONS catalysis CATALYSTECATALYST PRECURSORSYMCATALYST SYSTEMSE CATALYSTS CATIONNDUcation-forming reagentnCATIONIC ALKYLSSOCATIONIC ALKYLZIRCONIUMAT CENTER-UM ceriumZcesium compounds CH activationCHAINCHAIN TERMINATIONchain-transfer mechanism n8Ix0~TJ 1965-19660)Kerton, F. M. Lawless, G. A. Armes, S. P.wPIFirst example of a conducting polymer synthesised in supercritical fluids$Journal of Materials ChemistryJ. Mater. Chem.  19977310OCT J MATER CHEMISI:A1997YA163000025 Kerton, F.M 1998 Univerity of Sussex4 D.Phil Titanocene 69-78 $Khrushch, N. E. Bravaya, N. M.ZTInteraction of zirconocenes with polymethylalumoxane. Kinetics of methane liberation0)Journal of Molecular Catalysis a-ChemicalJ. Mol. Catal. A-Chem. 2000 156c 1-2y MAY 20 J MOL CATAL A-CHEMeISI:0000875265000044 2201-2202y81Kim, H. J. Jung, S. Jeon, Y. M. Whang, D. Kim, K.Novel low-valent zirconium porphyrin complexes: syntheses, characterization and x-ray crystal structures of (eta(5)- cyclopentadienyl)zirconium tetraphenylporphyrin and (eta(2)- diphenylacetylene)zirconium octaethylporphyrinChemical Communications Chem. Commun. 199722NOV 21 CHEM COMMUNISI:A1997YG75800035177-180.& Kim, Y. S. Ko, H. C. Park, H. S.F@Electronic structure and chemical bonding of zirconium disulfide Metals and Materials-KoreaMet. Mater.-Korea 200063JUN MET MATER-KOREAMISI:000088012000001S211-214.>8Kim, B. H. Woo, H. G. Kim, W. G. Yun, S. S. Hwang, T. S.RLDehalogenation of monohalopyridines catalyzed by group 4 metallocene reagent.'Bulletin of the Korean Chemical SocietyrkAROMATIC HALIDES; DERIVATIVES; BONDS; DEFLUORINATION; ACTIVATION; PYRIDINES; COMPLEXES; ZIRCONIUM; TITANIUMThe Cp'2MCl2/hydride (Cp' = Cp or Cp*: Cp = eta(5)-C5H5, CP* = eta(5)-C5Me5; M = Ti, Zr, Hf) reagent catalyzes the dehalogenation of monohalopyridines at room temperature to give pyridine. The catalytic activity decreases in the order of M = Ti > Zr > Hf: M-F approximate to M -Cl approximate to M-Br approximate to M-I; Cp2M > CpCp*M > Cp*M-2; Red-Al > N- Selectride > K-Selectride > L-Selectride >> DIBAL-H, MeLi, n- BuLi; 2-fluoropyridine > 3-fluoropyridine; C-F > C-Cl > C-Br. The rate of dehalogenation is boosted by adding 4 Angstrom molecular sieve. The catalyst combinations are all ineffective on the defluorination of fluorobenzenes and perfluorodecalin at the reaction condition. The possible mechanisms are suggested.Bull. Korean Chem. Soc. 2000212FEB 20 BULL KOR CHEM SOCISI:000085527600014571-572F@Kimura, K. Takaishi, K. Matsukawa, T. Yoshimura, T. Yamazaki, H.F?Polymerization of propylene by nonbridged zirconocene complexesChemistry Letters*#ELASTOMERIC POLYPROPYLENE; CATALYSTHANonbridged zirconocene dichlorides, (1,2-Me-2-4-RC5H2)(2) ZrCl2 (R = Me (3), Ph (4), p-FC6H4 (5), 2-furyl (6), 2-thienyl (7), and Fc (8)), and meso- and rac-(1-Me-3-PhC5H3)(2)ZrCl2 (9 and 10), in the presence of MAO show a high catalytic activity (8.1 similar to 17.4 x 10(6) gPP/molZr.h) in the polymerization of propylene and produce almost an atactic elastomeric polymer of high molecular weight (Mw = 10.5 similar to 23.2 x 10(4)). In contrast, rac-(1-Me-3-t-BuC5H3)(2)ZrCl2 (12) shows very low activity and produces a rather high isotactic polymer of low molecular weight. Chem. Lett. 19987 JUL CHEM LETTISI:000075153700003343-354 King, W. A. Marks, T. J.|Metal-Silicon Bonding Energetics in Organo-Group-4 and Organo- F-Element Complexes - Implications for Bonding and ReactivityInorganica Chimica ActaMInorg. Chim. Acta9 1995 229R 1-2NFEB INORG CHIM ACTASISI:A1995QN47500046627-635YleKing, W. A. DiBella, S. Lanza, G. Khan, K. Duncalf, D. J. Cloke, F. G. N. Fragala, I. L. Marks, T. J.Metal-ligand bonding and bonding energetics in zerovalent lanthanide, group 3, group 4, and group 6 bis(arene) sandwich complexes. A combined solution thermochemical and ab initio quantum chemical investigation.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1996 1183JAN 24 J AMER CHEM SOCISI:A1996TR63300013355-366A\VKing, W. A. Di Bella, S. Gulino, A. Lanza, G. Fragala, I. L. Stern, C. L. Marks, T. J.Absolute metal-ligand sigma bond enthalpies in group 4 metallocenes. A thermochemical, structural, photoelectron spectroscopic, and ab initio quantum chemical investigation.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.t 1999 121S2,JAN 20 J AMER CHEM SOCISI:0000790417000130\/<vzw|Td540-544.@9Kupfer, V. Thewalt, U. Horacek, M. Petrusova, L. Mach, K.{Formation of a binuclear titanocene hydride-magnesium hydride carbyl-bridged complex in the (C5Me4Ph)(2)TiCl2/Mg/THF system-("Inorganic Chemistry CommunicationsInorg. Chem. Commun. 19992C11NOV INORG CHEM COMMUNiISI:000083773600008192-202.&Kupfer, V. Mach, K. Thewalt, U.SjdSynthesis and structure of (pi-arene)titanium(II) haloaluminate complesex with diarylmethane ligands82Collection of Czechoslovak Chemical Communications$Collect. Czech. Chem. Commun. 2000652 $FEB COLLECT CZECH CHEM COMMUNeISI:000086481400005r 4139-4146f.'Kuroda, S. Dekura, F. Sato, Y. Mori, M.vlfFormation of silazirconacyclopentenes from zirconium-silene complex and alkynes and their reactivities.(Journal of the American Chemical Society CARBON BOND FORMATION; LOW-TEMPERATURE PHOTOCHEMISTRY; METAL- PROMOTED CYCLIZATION; SILYL HYDRIDE COMPLEXES; RAY CRYSTAL- STRUCTURE; X = CL; TRIS(TRIMETHYLSILYL)SILYL DERIVATIVES; HYDROZIRCONATION-TRANSMETALATION; ETA-2-SILANIMINE COMPLEXES; PHOSPHINE COMPLEXES.(During the course of our study on the formation of a complex having a zirconium-silicon bond, we found that zirconium-silene complex 7 was formed from Cp2ZrCl2 and Me2PhSiLi. In the presence of alkyne, diarylalkyne reacted with silene coordinated with zirconium to give silazirconacyclopentene 8. On the other hand, dialkylalkyne inserted into a zirconium- silene complex gave silazirconacyclopentene 9. Hydrolysis of 8 or 9 afforded vinylsilane 13 or allylsilane 16. Transmetalation of zirconacycle 8 into copper in the presence of allyl halide gave a bis-allylated compound in high yield, indicating that alkylation occurred on the alkyne carbon and the methyl group of silicon. From bis-allylated compounds, eight-membered ring compounds having silicon were obtained in high yield using olefin metathesis.J. Am. Chem. Soc. 2001 12318MAY 9 J AM CHEM SOCISI:000168495800004 1869-+<6Lamouroux, C. Moulin, C. Tabet, J. C. Jankowski, C. K.Characterization of zirconium complexes of interest in spent nuclear fuel reprocessing by electrospray ionization mass spectrometryo0)Rapid Communications in Mass Spectrometry "Rapid Commun. Mass Spectrom. 20001419 RAPID COMMUN MASS SPECTROMISI:0000895844000209 3829-3831CD=Lancaster, S. J. Thornton-Pett, M. Dawson, D. M. Bochmann, M. Borato-cyclopentadienyl half-sandwich complexes. Crystal structures of [NEt4][C5H5B(C6F5)(3)]center dot CH2Cl2 and [NEt4](2)[{C5H4B(C6F5)(3)}Zr(mu-Cl)Cl-2](2)OrganometallicsNOrganometallics 19981718AUG 31 ORGANOMETALLICSISI:000075791000001 12764-12777e,%Lanza, G. Fragala, I. L. Marks, T. J.nLigand substituent, anion, and solvation effects on ion pair structure, thermodynamic stability, and structural mobility in "constrained geometry" olefin polymerization catalysts: An ab initio quantum chemical investigationi.(Journal of the American Chemical SocietyZIEGLER-NATTA CATALYSIS; ETHYLENE POLYMERIZATION; GROUP-4 METALLOCENE; MOLECULAR-DYNAMICS; ANCILLARY LIGAND; (+) CATIONS; PROPYLENE POLYMERIZATION; AMIDO CATALYSTS; COMPLEXES; ZIRCONIUMAb initio quantum chemical calculations at the MP2 level were performed on the elementary reactions and structural reorganizations involved in activation and ligand binding by the "constrained geometry" olefin polymerization catalyst series R2Si(eta (5)-R'C-4(5))(R "N)Ti(CH3)R "' (R = H, CH3; R' = H, CH3; R " = CH3, t-Bu; R "' = H, CH3, CH2CH2CH3, CH(CH3)(2)) in the presence of the organo-Lewis acid cocatalyst B(C6F5)(3) and various solvation media. Calculated structures of the neutral precursors and resulting ion pairs are in good agreement with the experiment. Analysis of the R2Si(R'C-4(5))(R "N)TiR "'(+) naked cations reveals the importance of alpha, beta, and gamma C-H/C-C agostic interactions in selectively stabilizing various conformations of the TiR "' group as well as the diminished charge on Ti with the introduction of electron-donatings ligand substituents. The calculated ion pair formation enthalpies for the process R2Si(eta (5)-R'C-4(5))(R "N)Ti(CH3)R "' + B(C6F5)(3) -> R2Si(eta (5)-R'C-4(5))(R "N)TiR "'.H3CB(C6F5)(3) are in good agreement with experiment, the magnitudes reflecting a close interplay of ligand electronic and steric characteristics which weaken the precursor Ti-CH3 bond and stabilize the cationic product. The ion pair Ti . . .H3CB interaction is predominantly electrostatic in character and describable by a rather flat potential energy surface for elongation, and the energetics of heterolysis are strongly influenced by the capacity of the other Ti ligands and solvation to stabilize the separated charges.J. Am. Chem. Soc. 2000 12251DEC 27 J AM CHEM SOCISI:000166045000019805-813AB;Lappert, M. F. Pickett, C. J. Riley, P. I. Yarrow, P. I. W. D>Metallocene Derivatives of Early Transition-Metals .2. Substituted Cyclopentadienyl Group-4a Dichloro-Metallocene Complexes [M(Eta-C5h4r)2cl2] (M=Zr or Hf.R=Me, Et, Pri, but, or Sime3), Their Mono-Alkyl and Di-Alkyl Derivatives [M(Eta- C5h4r)2r'x] (X=Cl or R'-R'=Ch2sime3 or Ch2cme3), and Their D1 Reduction Productsm=:3Journal of the Chemical Society-Dalton Transactionsx"J. Chem. Soc.-Dalton Trans. 19813J CHEM SOC DALTON TRANSISI:A1981LG31400023814-821C`YLappert, M. F. Riley, P. I. Yarrow, P. I. W. Atwood, J. L. Hunter, W. E. Zaworotko, M. J.F?Metallocene Derivatives of Early Transition-Elements .3. Synthesis, Characterization, Conformation, and Rotational Barriers [for the Zr-C(Sp3) Bond] of the Zirconium(Iv) Complexes [Zr(Eta-C5h4r)2(Ch(Sime3)2)Cl] and the Crystal and Molecular-Structures of the Tetra-Butyl and Trimethylsilyl Complexes (R = Cme3 or Sime3)o:3Journal of the Chemical Society-Dalton Transactionss"J. Chem. Soc.-Dalton Trans.S 19813J CHEM SOC DALTON TRANSISI:A1981LG31400024bX1|_11_e1#_FMQs=H1@xeut=:_t::::k:jjP=P?Ma:5}:}5]RbC} 9sD7 Gorls19993 Gorls2000( Graf1998  Graf1999 Greci2000o Green1979 Green1981 Green1981 Green1989 Green1989} Green1990s Green1991t Green1991w Green1991x Green1991x Green1991j Green1992k Green1992l Green1992m Green1992o Green1992 Green1993f Green1993g Green1993_ Green1994` Green1994a Green1994c Green1994Y Green1995[ Green1995^ Green1995M Green1996N Green1996O Green1996> Green1997@ Green1997B Green1997H Green19973 Green19984 Green1998: Green1998 Green1999 Green1999 Green1999$ Green1999% Green1999 Green2000  Green2000 Green2000b Green2000$ Greene1999\^ Greene1999Gribakin1995 Griebenow2000 Grimes20000 Grimmer2000$ Guarini1996Guastini19839 Guery1985 Guidi1984Guidotti2000N Gulino19899n Gulino19999 Gun'ko19999 Gun'ko19999 Gun'ko2000 Guzei1997 Guzei2000 Guzei2000 Gyepes1997 Gyepes1998 Gyepes19999 Gyepes19999 Gyepes20000 Hackert1966b Haddad1989a Haddad1990 Hafner20000 Hagenau2000_ Haggitt1994M Haggitt1996O Haggitt1996Hagihara2000 Hakala2000 Halterman2000 Halterman2000r Halterman2001 Hamaide20003 Hampel19877D Han1993 Hanawa2000 Hanus1997 Hanus1998( Hanusa1997: Hanusa2001x Hao2001 Hara1995 Hara19991 Hara2000 Hara2000Z Harada200002 Harder19911 Harder19930 Harder1994/ Harder1995, Harder1996- Harder1996? Harder1996) Harder1997& Harder1998% Harder1999 Harder2000" Harder2000 Harder2001Hardesty2000 Harlan2000 Harris1981 Hart20000: Harvey2001Hasegawa19911Hasegawa2000 Haukka2001 Haussinger1999Haussuhl2000/Hayakawa2000 Heck20000 Heeg19911 Heeg19941 Heerdmann2000 Helaja2000 Heller19977 Heller19989 Henderson2000( Henein1997, Henzler1974X Herberhold1986W Herberhold1987 Herdtweck1986 Herdtweck1987  Herdtweck1991 Hernandez2000Herrmann19866Herrmann1986Herrmann1987 Herrmann1991Herrmann1994tHerrmann2001b Herzig2000 Herzog1994\ Herzog1994\r Herzog1996{ Herzog1996\ Herzog1996{ Hessen20000z Hessen20011 Hey-Hawkins2000 Hey-Hawkins2000h HeyHawkins1997( Heyn19898 Hickey200002 Hielscher19867 Hiller1995? Hiller1996 Hiller19966 Hiller1997 Hiller19977 Hiller19979 Hiller1998 Hiller20000  Hiltbrand2000 Hirata2000 Hirata2000m Hirva2001 Hitchcock1989_ Hitchcock1990] Hitchcock1991^ Hitchcock1991 Hitchcock1992Y Hitchcock1993Z Hitchcock1993 Hitchcock1994X Hitchcock1994 Hitchcock1995 Hitchcock1996P Hitchcock1996Q Hitchcock1996R Hitchcock1996S Hitchcock1996U Hitchcock1996V Hitchcock1996W Hitchcock1996L Hitchcock1997O Hitchcock1997 Hitchcock1998/ Hitchcock1998I Hitchcock1998 Hitchcock1999 Hitchcock1999 Hitchcock1999 Hitchcock1999 Hitchcock2000F Hitchcock2000! Hitchcock2000 Hjorth-Jensen2000H Ho1991 Ho1992 Ho1993A Ho1993E Ho19951F Ho1995G Ho19958 Hoffman1992< Hoffman1992 Hoffman1997`Hoffmann19769Z Hofmann1985 Holmes19855 Holst2001 Holt2000 Hong20000X Honold19866W Honold19871 Horacek1997 Horacek1998 Horacek1998 Horacek19985 Horacek19996 Horacek1999 Horacek1999 Horacek1999 Horacek1999 Horacek19992 Horacek2000 Horacek2000 Horacek2000 Hoskin2000& Hou1993 Hou1993b Housley1999 Hoveyda2000k Howard19922o Howard19929' Howard19989 Howard20010= Howie1986 Hu1998c Hu20000  Huang2000 Huffman1981} Huffman1981j Hughes1992m Hughes1992Y Hughes1995 Huhmann1993 Huhmann1994 Huhmann1995 Huhmann1996 Huhmann1996 Huhmann19970 Hunter19811z Hunter1983 Hunter19891m Hunter19966 Huo1997d Huo2000 Hursthouse19848 Hursthouse19858: Huttner1992 Hwang2000 Hylakryspin1994. Hylakryspin1995 Igau20000` Ikeda1999 Ikeda1999 Ikeda2000Ilinskii1990Imanishi2000 Immirzi1994a Incarvito1999 Ing20007 Inoue1992 Ishida2000}Ishihara1990aIshihara1994Ishitani20000 Isobe2000 Issleib1966%Ivchenko1998rC Ivleva19959 Iyer19979 Izmer2001Jacobsen19977Jacobsen2000 Jafarpour1999. Jafarpour2000 Jager1996 Jamieson2000 Jang19966 Janiak2000 Jankowski2000 Jayaratne2000 Jenny2000 Jeon1997` Jeong1999m Jeremic1996|Jezequel2001 Jin2000{ Jin2001Y Johnson1998 Johnston2000Johrendt20000 Joliat20000 Jomard2000 Jonas1983 Jones1981 Jones1993 Jordan1995> Jordan1996 Jordan2000 Joslin1992 Jung1997 Jung2000 Jung2000, Junge1996 Junk200002 Jutzi19863 Jutzi1987E Jutzi1997 Jutzi1997 Jutzi19984 Jutzi20005 Jutzi20006 Jutzi20007 Jutzi2001s Jutzi2001 Kaagman2000Kageyama19911Kageyama19988 Kahlal20000 Kamarudin1986 Kamarudin1989Kaminsky2000Kaminsky2000 Kampf1997 Kampf1999` Kang1999 Kang2000^ Kantardijeff1999$ Kantardjieff1999\2 Kanters1991 Kappesser2000] Karamallakis1991 Karim2000 Karim2000 Karim2000 Kasai1994 Kasai1996 Kasai1997 Kasani1997 Kaspar20000 Kato2000t Kaul20010P Keates19969R Keates19969T Keates1996K Keates1997L Keates19979H Keates19988I Keates19989 Kehr20000 Kehr20000 Kehr2000 Kehr20017 Keitemeyer2001U Keller1994{Y Kelsey1986 Kemnitz1998 Kemnitz1999 Kemnitz2000 Kempe1995 Kempe1995 Kempe1995 Kempe1996 Kempe1996 Kempe1996 Kempe1996 Kempe1997 Kempe1998 Kennedy2000J Kerton1997~ Kerton1998n/ Kerton19989. Kerton20000 Khainakov2000 Khan1990a Khan19966 Khan20000r Khan20010Kharisov19949Khrushch2000T Kibala1987 Kibala19888 Kibala1990 Kibala1991 Kibala1991 Kibala1991\ Kibala1990 Kibala1990 Kibala1991 Kibala1991% Kibala1991& Kibala1991G Kibala1991I Kibala1991kbJS~849-855A Gelmini, L. Stephan, D. W.Preparation, Reactivity, Hydroformylation Catalysis, and Structural Studies of the Early Transition-Metal Late Transition-Metal Heterobimetallic Complexes Cp2m(Mu- Pr2)2m'h(Co)Pph3 (M = Zr, Hf, M' = Rh, Ir)OrganometallicsbOrganometallicse 19887 4 APR ORGANOMETALLICSISI:A1988M971900010n 4169-4172IVOGentil, S. Pirio, N. Meunier, P. Gallucci, J. C. Schloss, J. D. Paquette, L. A.f`Stereoselective access to new half-sandwich complexes containing an isodicyclopentadienyl ligandOrganometallicsOrganometallics 20001920OCT 2 ORGANOMETALLICSISI:000089761500022807-810 RLGiannini, L. Dovesi, S. Solari, E. Floriani, C. Chiesi-Villa, A. Rizzoli, C.hbNeutral, cationic, and anionic alkyl derivatives of tungsten bonded to a calix[4]arene oxo surface.'Angewandte Chemie-International EditionAngew. Chem.-Int. Edit.s 1999386 ANGEW CHEM INT EDeISI:000079232700014 <Z2 Neumann, B. Neumuller, B. Neuner, B. Nguyen, T.Niccolai, G. P.Nicholas, K. M.Nielsen-Marsh, S.Nifant'ev, I.E.Nifantev, I. E.Nikitin, K. N.Nikitin, O. T. Nishihara, Y. Nissinen, M. Nitto, Y. Noda, Y. Noe, R. Noh, S. K. Nolt, M. Nolte, M.Noltemeyer, M. Nomura, K. Norton, J. R. Norton, R. J.O'Donoghue, M. B. Obert, S. J. Oh, J. K. Ohare, D. Ohff, A. Ohiff, A. Oishi, T. Okuda, J. Olbrich, F. Olivier, H. Ono, K. Optov, V. A. Orive, I. Oro-Sole, J. Osnes, E.Ostanin, S. A. Otani, S. Otero, A. Ott, M. Overby, J. S. Owuor, F. A. Oya, K. Ozarowski, A. Ozawa, K.0-P.Jutzi, T. Redeker B. Neumann H. G. Stammler Padilla, A.Pagenkopf, B. L.Pakkanen, T. A.Palacin, M. R. Palacios, F.Pallavicini, P. Pampaloni, G. Pandey, O. P. Panin, A. N.Papasergio, R. I.Papasergio, R.I.Pappalardo, D.Paquette, L. A. Park, D. K. Park, E. S. Park, H. S. Park, S. K. Parrahake, M. Parvez, M. Pasturel, A.Patrick, B. O. Patterson, W. Pauer, F. Paukov, I. E. Pauson, P. L. Pauson, P.L.Pellecchia, C.Pellinghelli, M. A. Pellny, P. M. Peng, S. M. Penlidis, A. Perrichon, V. Petersen, J.Petersen, J. L.Peterson, M. A. Petit, T.Petrukhina, M. A. Petrusova, L. Peulecke, N. Pez, G.P. Pflug, J.Phillips, R. A.Philson, S. B. Pichon, R.Pickett, C. J. Piers, W. E.Pindado, G. J. Pink, M. Pirio, N. Plat, D. Plenio, H. Poblet, J. M. Podlaha, J. Pohl, S. Polasek, M. Poli, R. Pollet, E. Polo, E.Pombrik, S. I.Ponomarev, V. I.Ponomaryev, V. I. Popham, N. A. Popham, N. H. Popowski, Y.Portela, M. F.Poumbga, C. N. Powell, A. K. Prashar, S. Prassides, K. Priego, J. L. Prini, G.Prokopenko, I. V.Prosenc, M. H. Protas, J. Proto, A. Prout, K. Puchta, G. T. Pulst, S. Pupi, R. M. Putnik, C.F. Qian, Y. L. Qin, Q. Z. Quan, R. W. Quijada, R. Quyoum, R. R. SerranoR.I.Papasergio Raabe, E. Rabe, G. Rahim, M. Ramos, J.Ramsier, R. D. Rand, C. L. Raoult, Y.Rasika Dias, H.V. Raston, C. L. Raston, C.L. Rath, N. P.Raudaschl-Sieber, G. Rausch, M. D. Re, N. Reddy, K. P. Redeker, T. Rees, L. H. Reid, A. F. Reid, S. M. Reiff, W. M.Reingold, A. L. Renault, P. Rep, M. Resconi, L. Rettig, S. J. Reumann, G. Reutov, O. A.Reynolds, L. E. L.Rheingold, A. L. Riabov, A. N.Ribeiro, M. R. Ridland, J. Rief, U. Rieger, B. Riley, P. I. Ritter, B. Rittinger, S.Rivas-Silva, J. F. Rizzoli, C. Rodriguez, A.Rodriguez, A. M. Rodriguez, G.Rodriguez, G. M.Roedelof, J. B. Roesky, H. W. Roesky, H.W. Roesmann, R. Rogers, J. S. Rogers, R. D. Rohmer, M. M. Rojas, R. Rooney, S. M.Rosenfeldt, F. Rosenthal, U. Rousseau, R.Rousset, C. J. Rouzaud, M. Royo, B. Royo, E. Royo, P. Ruchatz, D. Ruff, O. Rufin, A. Ruiz, M. J.Ruiz-Garcia, M. J. Rumpf, C.Ruotoistenmaki, J. Rush, G. E. Russ, B.J.Russell, J. M. Rust, J. Ryan, E. J.Rybakov, V. B. Rytter, E.,&S.I.Troyanov, G. N. Mazo M. A. Simonov Saak, W.Saarenketo, P. Sabat, M. Saburi, M. Sacchi, M. C. Saggio, G. Saito, J. Saito, K.Salamatov, E. I. Salaun, J. Y. Sammis, G. Samuel, E.Sanders, C. J. Sanders, J. Sanner, R. D. Sano, T. Santos, J. V. Sarjudeen, N.Sarsfield, M. J. Sarter, C.Sassmannshausen, J. Sato, M. Sato, Y. Saunders, J.Savinov, D. V. Z, 6` 1662-1664.$Cotton, F. A. Wojtczak, W. A.zTM2 Zirconium(Iv) Complexes, [Zr2cl8(Pme(3))(4)] and Trans- [Zri4(Pme(2)Ph)(2)] HAActa Crystallographica Section C-Crystal Structure Communications.60Acta Crystallogr. Sect. C-Cryst. Struct. Commun. 199450,&NOV 15 11 ACTA CRYSTALLOGR C-CRYST STRISI:A1994PT88100009 4364-4369u81Cotton, F. A. Lu, J. Shang, M. Y. Wojtczak, W. A.oTMPentanuclear Zirconium Clusters with Chloride, Hydride, and Phosphine-Ligands.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1994 116m10MAY 18 J AMER CHEM SOCISI:A1994NM98800026L187-190.$Cotton, F. A. Wojtczak, W. A.d^Synthesis and Structure of Zr2cl4(Eta-6-C6h5pme2)2(Pme2ph)2, an Arene Complex of Zirconium(Ii)Inorganica Chimica ActaCInorg. Chim. Acta 1994 2179 1-2AMAR INORG CHIM ACTAISI:A1994NA90200027 9-11$Cotton, F. A. Wojtczak, W. A..tnA Tris-(Mu-2-I) Face-Sharing Dizirconium(Iii) Complex, [1,4- Zr2i7(Pet3)2]- - the 1st Such Dizirconium SpeciesInorganica Chimica Acta.Inorg. Chim. Acta 1994 216  1-2AFEB INORG CHIM ACTA1ISI:A1994NA71500003N539-544..(Cotton, F. A. Chen, L. F. Schultz, A. J.voCombined single-crystal X-ray and neutron diffraction analysis of the structure of the [Zr6Cl18H5](3-)polyanionjdComptes Rendus De L Academie Des Sciences Serie Ii Fascicule B- Mecanique Physique Chimie Astronomie*#Comptes Rendus Acad. Sci. Ser. II-BD 1996 323380"OCT 17 C R ACAD SCI SER II BISI:A1996VP48300005 78-86O4.Cotton, F. A. Murillo, C. A. Petrukhina, M. A.|vReactions of TiCl4 with phosphines and alkylating reagents: an organometallic route to a titanium(II) cluster compound*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1999 573 1-2 JAN 31 J ORGANOMETAL CHEMISI:000078655000011\#D=Engelhardt,L.M. Papasergio, R. I. Raston, C. L. White,A. H.l 1984F@bis(mu!2$-Chloro)-chloro-(eta$5!-cvclopentadienyl)-zirconium(iv)Organometallics03U18 CEHPOUPJErker, G., Wicher, J., Engel, K., Rosenfeldt, F., Dietrich, W., Kruger, C. 1980*$Journal of American Chemical Society 102r 6344782-782C$Erker, G. Engel, K. Vogel, P.z(2,9-6,12-Eta-2,3,5,6-Tetrakis(Methylene)- Bicyclo[2.2.2]Octane)Zirconocene, an Isolable Bis(Olefin)Zirconium(Ii) Compound82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl. 19822110ANGEW CHEM INT ED8ISI:A1982PQ46300019RN:270-272."Cotton, F. A. Kibala, P. A.N2,Structural Characterization of Zr2cl8(Pph3)2HAActa Crystallographica Section C-Crystal Structure Communications60Acta Crystallogr. Sect. C-Cryst. Struct. Commun. 199147,%FEB 15 2 ACTA CRYSTALLOGR C-CRYST STRGISI:A1991FA122000131 1050-1053B<6Cotton, F. A. Feng, X. J. Shang, M. Y. Wojtczak, W. A.TNEmpty Octahedral Hexazirconium Clusters with Only 10 Electrons, [Zr6x14(Pr3)4]82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.1 1992318NAUG ANGEW CHEM INT ED2ISI:A1992JP34000025S499-507 $Cotton, F. A. Wojtczak, W. A.b[Dinuclear Compounds of Titanium(Iii) and Zirconium(Iii), with and without Metal-Metal Bonds Gazzetta Chimica ItalianaGazz. Chim. Ital.  1993 123C9(SEP GAZZ CHIM ITALISI:A1993MG16800006s330\IWuuSS#S\&_#9F9;pHNc ܐiYoOrganometallics103-105NPJDiamond, G. M. Green, M. L. H. Mountford, P. Popham, N. A. Chernega, A. N.New Metallocene Compounds of Zirconium and Hafnium Showing Unusual Ansa-Ligand Coordination - X-Ray Crystal-Structures of [((Ch2)(5)C(Eta(5)-C5h4)(Eta(2)-C9h6))Zr(Eta(5)-C5h5)Cl] and [(Me(2)C(Eta(5)-C5h4)(Eta(3)-C13h8))Zr(Eta(5)-C5h5)Cl]>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 19941"JAN 7 J CHEM SOC CHEM COMMUNISI:A1994MT19700051921-938 B8Canadian Journal of Chemistry-Revue Canadienne De Chimie$Can. J. Chem.-Rev. Can. Chim.  19916925FEB CAN J CHEMISI:A1991FA87600027l192-POLYDing, Y. W. Corey, J. Y.The Generation of High Mw Poly(Di-N-Butylstannane) from Dehydrogenative Condensation of Bu2snh2 in the Presence of Cp2mcl2 (M = Zr, Hf)/N-Buli:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1995 2101& AUG 20 2 ABSTR PAP AMER CHEM SOCISI:A1995RP25901458 2915-2918D:4Dinnebier, R. E. Neander, S. Behrens, U. Olbrich, F.LFSolid-state structures of base-free indenyllithium and fluorenylsodiumOrganometallicsOrganometallics 19991815JUL 19 ORGANOMETALLICSISI:000081625500030 Shur, V. B. SI, Troyanov Silveira, A. Sim, G. A.Simonov, G. N. Mazo M. A.Simonov, M. A.Simpson, S. J.Skelton, B. W. Skibbe, V.Smeets, W. J. J. Solari, E. Solari, G. Song, X. J. Sostero, S. Souter, J.Spannenberg, A. Spek, A. L. Spek, A.L.S Pindado2000: Pink20010 Pirio2000 Plat2000n Plenio1997 Poblet1995 Podlaha19973 Pohl19878? Polasek1996# Polasek1996 Polasek1996 Polasek1997 Polasek19979 Polasek19985 Polasek19996 Polasek1999 Polasek1999 Polasek1999q Poli1991 Poli1996 Pollet2000tH Polo1997 Polo1999 Polo2000 Pombrik1994g Ponomarev1987` Ponomaryev1989j Popham1992g Popham19933` Popham19944c Popham19949 Popham1999 Popowski2000X Portela2000 Poumbga1994$ Powell19999 Powell1999u Prashar2001M Prassides1997b Priego2000H Prini1997 Prini1999 Prokopenko1986 Prokopenko19866 Prokopenko19870 Prosenc1994% Prosenc1996- Prosenc1996? Prosenc1996= Protas19787 Proto2000 Prout1981s Prout1991t Puchta20010 Pulst1996 Pupi1995V Putnik1979 Qian2001 Qin2000 Quan1994~ Quijada2001m Quyoum1996 Raabe1989p Raabe1990S Raabe1990D Rabe1991e Rahim1998 Rahim2000 Ramos2000 Ramsier2000 Rand1981 Rand19839L Raoult198999 Raoult1992D Rasika Dias19971 Raston19811 Raston19844# Raston19841( Raston19866' Raston19871 Raston19977 Rath19959 Rath19959 Rath19966 Rath19966 Rath19977tRaudaschl-Sieber2001d Rausch1974m Rausch1979k Rausch1984> Rausch19855X Rausch1986W Rausch1987M Rausch19888 Rausch1993 Rausch2000 Re1997iw Re1998il Re1999io Re1999ic Re2000i Reddy1992E Redeker1997 Redeker1997 Redeker1998b Rees20000 Reid1965. Reid1998 Reid19999& Reiff1999aReingold19999= Renault1978 Rep2000 Resconi2000b Rettig1989a Rettig1990` Rettig1992 Rettig1995{ Rettig19977[ Rettig1997Z Rettig19981 Rettig19999X Rettig1999. Rettig20000y Rettig20011S Rettig20016 Reumann20003 Reutov19983Reynolds1993 Rheingold1994* Rheingold1996 Rheingold1997 Rheingold2000 Riabov20011X Ribeiro2000b Ridland1999% Rief19969- Rief19969 Rieger2000/ Riley19810 Riley1981= Ritter19977: Rittinger1992 Rivas-Silva2000t Rizzoli1998u Rizzoli1998w Rizzoli1998k Rizzoli1999l Rizzoli1999o Rizzoli1999c Rizzoli2000; Rodriguez19926 Rodriguez1993 Rodriguez1994( Rodriguez1995 Rodriguez1996 Rodriguez1997g Rodriguez1997] Rodriguez1999 Rodriguez2000 Rodriguez2001 Roedelof19888D Roesky1991 Roesky1994{ Roesky1994{o Roesky1995r Roesky1996{ Roesky1996{ Roesky1996{ Roesky1997& Roesky1999\x Roesky2001Roesmann2001R Rogers1981> Rogers1985P Rogers1989 Rogers1999 Rogers2000 Rohmer1991 Rohmer1992 Rohmer1995~ Rojas2001 Rooney1996 Rosenfeldt1980{ Rosenfeldt1982V  Rosenthal1993  Rosenthal1993  Rosenthal1993 Rosenthal1994 Rosenthal1995 Rosenthal1995 Rosenthal1995 Rosenthal1996 Rosenthal1996 Rosenthal1996 Rosenthal1996 Rosenthal1996 Rosenthal1997 Rosenthal1997 Rosenthal1998 Rosenthal1999 Rosenthal1999 Rosenthal19992 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000HRousseau1991FRousseau1995 Rousset1991 Rousset1991 Rousset1991 Rousset1991 Rousset1991 Rousset1991 Rousset1991sek1999 Polasek1999q Poli1991 Poli1996 Pollet2000tH Polo1997 Polo1999 Polo2000 Pombrik1994g Ponomarev1987` Ponomaryev1989j Popham1992g Popham19933` Popham19944c Popham19949 Popham1999 Popowski2000X Portela2000 Poumbga1994$ Powell19999 Powell1999u Prashar2001M Prassides1997b Priego2000H Prini1997 Prini1999 Prokopenko1986 Prokopenko19866 Prokopenko19870 Prosenc1994% Prosenc1996- Prosenc1996= Protas19787 Proto2000 Prout1981s Prout1991t Puchta20010 Pulst1996 Pupi1995V Putnik1979 Qian2001 Qin2000 Quan1994~ Quijada2001m Quyoum1996 Raabe1989p Raabe1990S Raabe1990D Rabe1991e Rahim1998  Rahim2000 Ramos2000 Ramsier2000 Rand1981 Rand19839L Raoult198999 Raoult1992D Rasika Dias19971 Raston19811 Raston19844# Raston19841( Raston19866' Raston19871 Raston19977 Rath19959 Rath19959 Rath19966 Rath19966 Rath19977tRaudaschl-Sieber2001d Rausch1974m Rausch1979k Rausch1984X Rausch1986W Rausch1987M Rausch19888  Rausch1993 Rausch2000 Re1997iw Re1998il Re1999io Re1999ic Re2000i  Reddy1992E Redeker1997 Redeker1997 Redeker1998b Rees20000 Reid1965. Reid1998 Reid19999& Reiff1999aReingold19999 Rep2000 Resconi2000 Rettig1995{ Rettig19977 Rettig19999. Rettig20000y Rettig200116 Reumann20003 Reutov19983Reynolds1993 Rheingold1994* Rheingold1996 Rheingold1997 Rheingold2000 Riabov20011X Ribeiro2000b Ridland1999% Rief19969- Rief19969 Rieger2000/ Riley19810 Riley1981= Ritter19977: Rittinger1992 Rivas-Silva2000t Rizzoli1998u Rizzoli1998w Rizzoli1998k Rizzoli1999l Rizzoli1999o Rizzoli1999c Rizzoli2000; Rodriguez19926 Rodriguez1993 Rodriguez1994( Rodriguez1995 Rodriguez1996 Rodriguez1997g Rodriguez1997] Rodriguez1999 Rodriguez2000 Rodriguez2001 Roedelof19888D Roesky1991 Roesky1994{ Roesky1994{o Roesky1995r Roesky1996{ Roesky1996{ Roesky1996{ Roesky1997& Roesky1999\x Roesky2001Roesmann2001P Rogers1989 Rogers1999 Rogers2000 Rohmer1991 Rohmer1992 Rohmer1995~ Rojas2001 Rooney1996 Rosenfeldt1980{ Rosenfeldt1982V  Rosenthal1993  Rosenthal1993  Rosenthal1993 Rosenthal1994 Rosenthal1995 Rosenthal1995 Rosenthal1995 Rosenthal1996 Rosenthal1996 Rosenthal1996 Rosenthal1996 Rosenthal1996 Rosenthal1997 Rosenthal1997 Rosenthal1998 Rosenthal1999 Rosenthal1999 Rosenthal19992 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000 Rosenthal2000HRousseau1991 Rousset1991 Rousset199191 p`tvz|{zx w 3300-33100)Erker, G. Wicher, J. Engel, K. Kruger, C.0*(S-Trans-Eta-4-Diene)Zirconocene Complexes Chemische Berichte-RecueilChem. Ber.-Recl. 1982 11510 CHEM BER-RECLISI:A1982PL76000007 3311-33232,Erker, G. Engel, K. Kruger, C. Chiang, A. P.HBReactivity and Structure of (S-Cis-1,3-Diene)Zirconocene Complexes Chemische Berichte-RecueilChem. Ber.-Recl. 1982 115C10 CHEM BER-RECLISI:A1982PL76000008i 2437-2446rErker, G. Kropp, K.lNGDyotropic Rearrangements of Dinuclear Mu-Aldehyde-Zirconocene Complexesr Chemische Berichte-RecueilChem. Ber.-Recl. 1982 115I7C CHEM BER-RECLnISI:A1982NY46100005a 1285-1292Erker, G. Rosenfeldt, F.VPRadical Reaction Paths in Thermically-Induced Reactions of Zirconocene Complexes Tetrahedrone Tetrahedron. 1982389I TETRAHEDRONMISI:A1982NV85600019N 1277-12782+Erker, G. Berg, K. Treschanke, L. Engel, K.F?Convenient Route to Monocyclopentadienylzirconium(Iv) ComplexestInorganic Chemistry Inorg. Chem. 1982213H INORG CHEMISI:A1982NE35000085a 1555-1561R6/Erker, G. Kropp, K. Atwood, J. L. Hunter, W. E.AReactions of Vinylzirconocene Complexes with a Zirconium Hydride - the Unexpected Formation of [Mu-(Beta-Eta-1- Alpha,Beta-Eta-2-Styryl] (Mu-Chloro)Bis[Bis(Eta-5- Cyclopentadienyl)-Zirconium], a Binuclear (Olefin)Zirconocene ComplexOrganometallicsaOrganometallicsh 1983211ORGANOMETALLICSBISI:A1983RR26300013e455-456TRKErker, G. Berg, K. Kruger, C. Muller, G. Angermund, K. Benn, R. Schroth, G.(Eta-3-Allyl)(Eta-4-Butadiene)(Eta-5-Cyclopentadienyl)- Zirconium, a System of Isomeric Monocyclopentadienylzirconium(Ii) Compounds82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.  1984236ANGEW CHEM INT EDIISI:A1984TE12000022 1383-1397S.'Erker, G. Berg, K. Benn, R. Schroth, G.iNGFormation of Chiral Mono(Eta-5-Cyclopentadienyl)Zirconium(Ii) Complexes Chemische Berichte-RecueilChem. Ber.-Recl. 1985 118C4c CHEM BER-RECL0ISI:A1985AGG2700008E(!Erker, G., Kruger, C., Muller, G.r 1988Adv. Organomet. Chem.241ngErker,G. Sarter,C. Albrecht, M. Dehnicke, S. Kruger, C. Raabe, E. Schlund, R. Benn, R. Rufin, A.  1989F?15-Crown-5 diaqua-trichloro-(eta$5!-cyclopentadienyl)-zirconiumg*#Journal of Organometallic Chemistry0 377 C55n VEBWUU VEHLEZMf`Erker,G. Sarter,C. Albrecht,M. Dehnicke, S. Kruger, C. Raabe, E. Schlund,R. Benn,R. Rufin,A. 1990LFTrichloro-(eta$5!-cyclopentadienyl)-bis(dimethylformamide-O)-zirconiumJ.Organomet.Chem.f 382 89 VEHLOJYtK>Tv 5217-5222.(Kato, S. Ozawa, K. Edamoto, K. Otani, S.D=Photoelectron spectroscopy study of the oxidation of ZrC(100)\UJapanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review PapersD>Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. 2000399ASEP JPN J APPL PHYS PT 1ISI:0000895423000419 1627-16280)Keates, J. M. Lawless, G. A. Waugh, M. P.$Yb-171 CP MAS NMR spectroscopyChemical Communications Chem. Commun.d 199614JUL 21 CHEM COMMUNISI:A1996UZ34200014 2842-2846"Keates, J. M. Lawless, G. A.Yb-171 cross-polarization magic angle spinning NMR spectroscopic studies of organometallic compounds: Bis(cyclopentadienyl) derivativestOrganometallicsOrganometallicsC 19971613JUN 24 ORGANOMETALLICSISI:A1997XG56200014s258-266.4-Kehr, G. Frohlich, R. Wibbeling, B. Erker, G.hzs(N-pyrrolyl)B(C6F5)(2) - A new organometallic Lewis acid for the generation of group 4 metallocene cation complexesh"Chemistry-a European Journal4-alkyl anion abstraction; boron; ion pairs; Lewis acids; metallocenes; Ziegler catalysts OLEFIN POLYMERIZATION CATALYSTS; HALF-SANDWICH COMPLEXES; C-H ACTIVATION; ZIEGLER CATALYST; X-RAY; MOLECULAR-STRUCTURES; CRYSTAL-STRUCTURE; ALPHA;BETA-UNSATURATED CARBONYL; DEACTIVATION PATHWAYS; NITRILE COMPOUNDSTreatment of the (C6F5)(2)BF . OEt2 (3) complex with N-pyrrolyl lithium gives bis(pentafluorophenyl)(N-pyrrolyl)borane (2). a strong organometallic Lewis acid. which was characterized by X- ray diffraction (B-N bond length: 1.401(5) Angstrom). It exhibits a columnar superstructure in the crystal and contains pi-stacks of pyrrolyl units. Compound 2 readily abstracts alkyl anions from a variety of alkyl Group 4 metallocene-type complexes and leads to the clean formation of the respective metallocene ions or ion pairs. For example. the treatment of Cp3ZrCH3 (9) with 2 transfers a methyl anion to yield the ion pair [Cp3Zr](+)[(C4H4N)B(CH3)(C6F5)(2)](-) (12). The X-ray crystal structure analysis of 12 shows a close contact between zirconium and the pyrrolyl-beta-carbon (2.641(2)Angstrom). The borane 2 adds to (butadiene)zirconocene (13) to yield the betaine system [Cp2Zr](+)[(C4H6)B-(NC4H4)(C6F5)(2)](-) (15). Complex 15 contains a distorted eta(3)-allyl moiety inside the metallacyclic framework and it features an internal Zr+...(pyrrolyl)B- ion pair interaction with a Zr-... pyrrolyl- alpha-carbon separation of 2.723(3) Angstrom (determined by X- ray diffraction). From the dynamic NMR spectra of 15 the bond strength of the internal ion pair interaction was estimated to be Delta G(diss)(+) (223 K) approximate to 15 kcal mol(-1). Treatment of dimethylzirconocene (16 with 2 yields the metallocene berate salt [Cp2ZrCH3](-)[(C4H4N)B(CH3)(C6F5)(2)](- ) (17), which is an active catalyst for the polymerization of ethene.  Chem.-Eur. J.n 20006A2CJAN CHEM-EUR JISI:000084931200006e535-538<6Kehr, G. Roesmann, R. Frohlich, R. Holst, C. Erker, G.Protonation of the heterocyclic Cp-anion equivalent [pyrrolyl- B(C6F5)(3)]Li - Formation of a useful neutral Bronsted acid for the generation of homogeneous metallocene Ziegler catalysts.'European Journal of Inorganic Chemistrynprotonations; heterocycles; homogeneous catalysis; bronsted acids; zirconium OLEFIN POLYMERIZATION; COORDINATION CHEMISTRY; TRIS(PENTAFLUOROPHENYL)BORANE; COMPLEXES; CYCLOPENTADIENYL; FLUOROCARBONS; ZIRCONIUM; TITANIUM$N-pyrrolyllithium (1) adds to B(C6F5)(3) to yield [(C4H4N)B(C6F5)(3)]Li (3) The corresponding monoetherate (3 . OEt2) was characterized by X-ray diffraction and shows an eta (5) coordination of the pyrrolyl moiety to the Lithium cation. Treatment of 3 with HCl in ether leads to H+ addition at a pyrrolyl a-position to yield the neutral dipolar Bronsted acid system [(C4H5N)B(C6F5)(3)] (4) The reagent 4 can be used to protonate Cp2Zr(CH3)(3) to yield [Cp2Zr(CH3)(+)(C4H4N)B(C6F5)(3)(-)] (6) and methane. H+ transfer from 4 to (butadiene)-zirconocene results in the formation of the (pi -allyl)metallocene salt [(C4H7)ZrCp2+(C4H4N)B(C6F5)(3)(-)] (8). In analogous reactions. the neutral Bronsted acid was employed as a protonating activator component for the generation of homogeneous Ziegler catalysts derived from a variety of (butadiene)or (dimethyl)ansa-metallocenes. The systems generated by treatment with 4 show comparable activities in ethene or propene polymerization reactions as conventionally generated Group 4 metallocene Ziegler catalysts.Eur. J. Inorg. Chem. 20012FEB EUR J INORG CHEMISI:000166654500029331-332R Kelsey, B. A. Ellis, J. E.Synthesis, Characterization, and Properties of the Pentamethylcyclopentadienyltetra-Carbonylmetallates(0) of Titanium and Zirconium - Anionic and Carbocyclic Derivatives of Zerovalent Group-4 Carbonyls, (C5me5)M(Co)4>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 19864e$FEB 15 J CHEM SOC CHEM COMMUNISI:A1986A37200003420012FEB EUR J INORG CHEMISI:000166654500029331-332R Kelsey, B. A. Ellis, J. E.Synthesis, Characterization, and Properties of the Pentamethylcyclopentadienyltetra-Carbonylmetallates(0) of Titanium and Zirconium - Anionic and Carbocyclic Derivatives of Zerovalent Group-4 Carbonyls, (C5me5)M(Co)4>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 19864e$FEB 15 J CHEM SOC CHEM COMMUNISI:A1986A372000034Choueiry1998Choueiry19988 Choukroun1984L Choukroun1989D Choukroun19919 Choukroun1992# Choukroun1996  Choukroun1997 Choukroun2000 Choukroun2000 Chu2000 Chu2000PChurakov1995JChurakov19966Churakov199663Churakov1998'Churakov1998rN Ciliberto1989g Ciruelo1997q Ciruelo2001Ciruelos1996dCiruelos1998WCiruelos2000Cisarova1998Cisarova19999Cisarova19999Cisarova20000 Clase2000 Clauss20002 Cleary19949b Clegg1999o Cloke1979 Cloke1981 Cloke1981 Cloke1987] Cloke1991^ Cloke1991 Cloke1996 Coalter1995 Cochran2000Z Cohen1998 Cole20002 Cole20011e Collins1998 Collins2000 Colomb2000tP Constantine1996R Constantine1996S Constantine1996V Constantine19961 Constantine1997L Constantine1997F Constantine2000\ Convery1991( Convery1995 Cook20000 Corey1992 Corey1992 Corey1993 Corey1994 Corey1995 Corey1995 Corey1995 Corey1995 Corey1996 Corey1996 Corey1996 Corey1996 Corey1997 Corey2000| Corker20010Q Corradi1996 Corradi1997N Corradi1997 Corradi2000] Corrochano1999iX Corrochano2000iE Cotter19939 Cotter2000 Cotton19531T Cotton1987 Cotton1988 Cotton1990 Cotton1991 Cotton1991 Cotton1991 Cotton1991l Cotton1991 Cotton1992 Cotton1993 Cotton1994 Cotton1994 Cotton1994 Cotton1994 Cotton1995 Cotton1996 Cotton1996 Cotton1996 Cotton1996 Cotton1997 Cotton1997 Cotton1997 Cotton1998  Cotton1999 Courtot1989v Courtot1991 Coville2000 Cox1981F Cox2000l Crescenzi1999M Cristofolini1997 Crouse20000j Crowte1992s Cruz20000 Cuenca1985 Cuenca1986 Cuenca19878B Cuenca1991; Cuenca19926 Cuenca1993( Cuenca1995+ Cuenca1995 Cuenca1996j Cuenca1996 Cuenca19969g Cuenca19977h Cuenca1997d Cuenca19989W Cuenca20000 Cuenca20000 Cuenca2000q Cuenca20011 Curtis2000D'Attoma19999D Dahan1991Dahlmann19988Dahlmann2000Dahlmann2000Dahlmann2000Dahlmann2000] Dalby1991 Dall'Occo2000 Damo20000 Daniele1999 Daturi2000S Davis1996E Davis1997( Davis1998* Davis1998. Davis19987 Davis19989 Davis1998< Davis1998 Davis1999 Davis1999 Davis1999 Davis1999 Davis1999 Davis1999 Davis1999& Davis1999 Davis2000 Davis2000 Davis2000 Davis2000 Dawson1998t Day1981 Day1993J Day1999 de Boer1989\de Jesus1999 de Koning2000\ de la Mata1999V Deboer19899 Deboer19899 Deck2000 Deck2000k Deckers2000 Deelman1996 Deelman1999Dehnicke1989rpDehnicke1990rSDehnicke1990rDehnicke1993eDehnicke1993e3 Dekock1993w Dekura2001P DeLima1996R DeLima1996V DeLima19966L DeLima1997H Della Bona1998 Della Sala2000:Delvilledesbois1992p Demerseman1976n Demerseman1977 Demsar1994{r Demsar1996{ Demsar1996{ Denisov1993 Denisov1997M Denner1988 Destro2000\Devereux1991nDi Bella1999t Diamond1991k Diamond1992l Diamond1992o Diamond1992g Diamond1993` Diamond1994c Diamond1994 Diamond1994N Diamond1996 DiBella1996H Dick1991L Dick1991M Dick1991 Diebold1988Dietrich19808 Ding1995' Dinnebier1997; Dinnebier1999 Dobbs1989 Dobbs1991 Dobbs1991r Dockter2001 Dodge2000 Doerrer1999 Doerrer2000b Doerrer2000b Doherty19994 Dohler199994Dohmeier1996 Donnadieu2000 Donnadieu2000u dos Santos2001k Dovesi19999 Drake1993A Drake1993 Dreier2000 Dreier20019 Drewitt1997cDrummond1970 Dubner20000! Dubnikova2000 Dubnikova2000 Duchateau1991[ Duchateau1995^ Duchateau1995 Duchateau1997| Dufaud20010 Duff1983 Duff1986 Duff19891i Duggan19762 Duisenberg1991 Duncalf1996U Duncalf1996W Duncalf1996N Duncalf1997 Duncalf1998 Duncalf2000 Dunlap20000Durand-Niconoff2000=Dusausoy1978 Duval1995V Duval1999X Duval1999y Duval2001S Duval2001 Dzuba1995Y Eaborn1993 Eadie20004 Ecker1996W Eckert19999 Edamoto2000[Edelmann19955^Edelmann19955j Edwards1992 Efimov19861 Efimov1987C Egan19831 Eilertsen2000 Eisch1994r Eisch1998j Eisch1999 Eisen2000 Ekholm2000 Ekholm2001` Elian1976Elizarov19988Y Ellis1986Q Ellis1988R Ellis1988 Ellis1993 Ellis1996bElsegood19999Elsevier2000( Elsner19899 Engel1980 Engel1982w Engel1982x Engel1982| Engel1982Engeland2000( Engeler1989# Engelhardt1984E' Engelhardt1987$ Englert1996 Erker1980 Erker1982w Erker1982x Erker1982y Erker1982z Erker1982{ Erker1982| Erker1982z Erker1983} Erker1983v Erker1984w Erker1984t Erker1985 Erker1988 Erker1989p Erker1990S Erker1990 Erker1993  Erker1993 Erker1993 Erker1998 Erker1999 Erker2000 Erker2000 Erker2000 Erker2000 Erker2000 Erker2000 Erker2000 Erker2000 Erker2000 Erker2000} Erker2001 Erker2001 Erker2001 Erkoc2000. Ernst1995b Errington1999 Espina20000 Etienne1984; Evans1992< Evans1992  Evans2000| Evans2001_ Ewart1999r Fahey2001 Fally2000 Fan2000] Fandos19991 Fandos2000 Fanwick1991 Faure2000 Feifel2000  Feil2000 Feil20010 Feng19929 Feng20000 Feng20000 Feng2001E Fermin1995 Fernandez1997 Fernandez2000]Fernandez-Baeza1999XFernandez-Baeza2000| Fiddy2001 Fink19989 Fink2000 Fink20000 Finn20000 Finocchio2000 Fiori2000> Fischer1996@ Fischer1996 Fischer19983 Fischer2000Flambaum1995 Flores1999\ Flores19991Floriani19838Floriani1984Floriani1997tFloriani1998uFloriani19988wFloriani1998aeFloriani19999hFloriani19999kFloriani1999lFloriani19999oFloriani19999qFloriani1999Floriani1999hFloriani19999kFloriani1999lFloriani19999oFloriani19999qFloriani1999Floriani19999Floriani19999Floriani1999Floriani19999Floriani199998 3824-3829sXQHalterman, R. L. Zhu, C. J. Chen, Z. L. Dunlap, M. S. Khan, M. A. Nicholas, K. M.nPreparation of [2,5-diisopropylcyclohexane-1,4- bis(indenyl)]titanium dichloride and [2,5- diisopropylcyclohexane-1,4-bis(tetrahydroindenyl)]- titanium dichloride and their comparison as catalysts for the enantioselective pinacol coupling of benzaldehydeOrganometallicsANSA-METALLOCENE DERIVATIVES; CHIRAL TITANOCENE CATALYST; BRIDGED TETRAHYDROINDENYL LIGANDS; BUFFERED PROTIC CONDITIONS; ASYMMETRIC HYDROGENATION; PROPENE POLYMERIZATION; ZIRCONIUM DICHLORIDES; ZIRCONOCENE CATALYSTS; ALIPHATIC-ALDEHYDES; COMPLEXES The nonracemic bis(indene) (+)-(1R,2R,4R,5R)-1,4-bis(3'- indenyl)-2,5-diisopropylcyclohexane, (10) was synthesized in 60% yield from the addition of indenyllithium to the corresponding bis(methanesulfonate) ester of 2,4-diisopropyl- 1,4-cyclohexanediol. Deprotonation of bis(indene) 10 with n- BuLi followed by metalation with TiCl3 and oxidative workup (HCl, air, chloroform) gave the single stereoisomeric 2, 5- diisopropylcyclohexane-1,4-diyl-bridged bis(indenyl)titanium dichloride 3 in 80% yield. Attempts to form the corresponding bis(indenyl)zirconium dichloride were unsuccessful. Catalytic hydrogenation of bis(indenyl)titanium dichloride 3 gave the 2,5-diisopropylcyclohexane-1,4-diyl-bridged bis(tetrahydroindenyl)titanium dichloride 4 in 76% yield. The solid-state structure of 4 was determined by X-ray crystallographic methods. Nonracemic mixtures of chiral bis(indenyl)titanium dichloride 3 and bis(tetrahydroindenyl)titanium dichloride 4 were examined as catalysts for the pinacol coupling of benzaldehyde in the presence of manganese metal. The enantioselectivities for dihydrobenzoin were 0% with bis(indenyl) 3 and 32% with bis(tetrahydroindenyl) 4 to give the first comparison of enantioselectivities with corresponding bis(indenyl) and bis(tetrahydroindenyl) complexes.Organometallics 20001919SEP 18 ORGANOMETALLICSISI:000089393600013 12-19..(Halterman, R. L. Schumann, H. Dubner, F.Synthesis and structure of ansa-metallocene complexes (M = ZrCl2, TiCl2, YCl, and LuCl) containing the bis(2-methyl- 4,5,6,7-tetrahydroinden-yl)dimethylsilane ligando*#Journal of Organometallic ChemistryiPItetrahydroindenyl ligand; ansa-Bis(tetrahydroindenyl)metal; chiral metallocenes; zirconocene dichloride; titanocene dichloride; Bis(tetrahydroindenyl)yttrium chloride; Bis(tetrahydroindenyl)lutetium chloride BRIDGED TETRAHYDROINDENYL LIGANDS; CRYSTAL-STRUCTURES; AMINE ELIMINATION; DICHLORIDES; DERIVATIVES; TITANOCENE; ZIRCONIUMjdThe three step synthesis of 2-methyl-4,5,6,7-tetrahydro-1H- indene from cyclohexyl methacrylate is described [(a) PPA cyclization: (b) LiAlH4 reduction. (c) HCl dehydration]. This annelated trisubstituted cyclopentadiene was bridged selectively to form ethylene- or dimethylsilyl-bridged bis(2- methyl-4,5,6,7-tetrahydro-1H-inden-1-yl) ligands. Metal complexes (M = ZrCl2, TiCl2 YCl, and LuCl) of the bis(2-methyl- 4,5,6,7-tetrahydroinden-1-yl)dimethylsilane ligand were formed as meso/dl stereoisomeric mixtures in ratios from 1:1 to 2:1 dl:meso. (C) 2000 Published by Elsevier Science S.A. All rights reserved.J. Organomet. Chem. 2000 6041JUN 5 J ORGANOMET CHEMISI:000088339500003 /d chelatesiCHELATING DIAMIDE CHELATING DIAMIDE COMPLEXESCHEMICAL CHARACTERISTICSSCHEMICAL VAPOR-DEPOSITION chemistrychiral metallocenetadchiral metallocenesin$CHIRAL ORGANOMETALLIC REAGENTSchiral phosphanesCHIRAL TITANOCENE CHIRAL TITANOCENE CATALYSTES CHLORIDESchlorodimethylsilyl-chromatography (GPC)oCLNTA CLEAVAGEI COBALTDES cocatalystsec COMONOMERcomonomer response th COMPLEXEM COMPLEXES COMPOUNDU COMPOUNDS CONSTRUCTIONN CONTROLIO CONTROLLEDD F CONTROLLED CARBOMETALATIONTS CONVENIENTTEDCONVENIENT METHODCONVENIENT PROCEDURENCOOPERATIVE ACTIVATION COCOORDINATED DINITROGENTUR COORDINATIONCCOORDINATION CHEMISTRYCOORDINATION CONDITIONSSNCOORDINATION GAP APERTURECOPOLYMERIZATIONL COPOLYMERSTIOCORETCORRELATION-ENERGY TH couplinge CP2ZR(H)CL SCHWARTZ REAGENTS CP2ZRCL2S CRYSTALMTcrystal structurecrystal structuresܐ CRYSTAL-RCRYSTAL-STRUCTURECRYSTAL-STRUCTURESܐ CRYSTALLIZABLE HYDROCARBONIONCRYSTALLIZATIONNE CRYSTALLOGRAPHIC STRUCTUREZ CUMULENER CYCLICLARCYCLIC ALLYLIC ETHERSCYCLIC CUMULENEEN CYCLIC HYDROBORATE COMPLEXEScyclic olefin copolymers CYCLIZATIONEXcyclization reactions CYCLOALKYNESE CYCLODEXTRINAcyclopenadienylscyclopentadienesCYCLOPENTADIENIDEcyclopentadienyln cyclopentadienyl carbanionsZ CYCLOPENTADIENYL COMPOUNDSZCYCLOPENTADIENYL LIGANDS cyclopentadienyl phosphineZCYCLOPENTADIENYL RINGCYCLOPENTADIENYLLITHIUMTI D(0)F(N) TRANSITION-METALSNALDEACTIVATION PATHWAYSDEFLUORINATIONEScdehydrocouplingDEHYDROPOLYMERIZATION DENDRIMERSONNdensity functional theoryDENSITY-FUNCTIONAL THEORY DERIVATIVESUCDIALKYLZIRCONOCENESIZDIAMIDO LIGANDLEXdiastereoselectioniYDIAZODIAZOALKANE COMPLEXES DICHLORIDEELYDICHLORIDE COMPLEXESN DICHLORIDESYMDIENE COMPLEXESN dienesnju DIENYLETA,'differential scanning calorimetry (DSC) dimerization dimethylc DINITROGENDLYDINITROGEN REDUCTIONI$dinuclear metallocene complexes$disiloxane-bridged metallocene DISPLACEMENTTDISUBSTITUTED 1MA diyenesle DIYNESATI DOPED INPDOT-F DOUBLE-BONDdoubly bridgedmpl dynamic NMR. EARLY TRANSITION METALSYEARLY TRANSITION-effect of substituentstioEFFECTIVE CORE POTENTIALS EFFICIENTEFFICIENT SYNTHESISON ELASTOMERICTR ELASTOMERIC POLY(PROPYLENE)elastomeric polypropyleneELECTROCHEMISTRYVelectron deficiencyELECTRON OXIDATIONCTIELECTRON-SPIN-RESONANCEY ELECTRONIC-ELELECTRONIC-STRUCTURE electrophilic substitutionane elementsu ELIMINATIONUC EMISSIONY end-group END-ONEN- ENYNESALK epoxidationleepsilon-caprolactampr EQUILIBRIAPOL ETA-2-SILANIMINE COMPLEXESLAT ethenemerETHENE POLYMERIZATION$ETHENE/PROPENE COPOLYMERIZATIONETHER DERIVATIVES ETHYLENEOETHYLENE COMPLEXYethylene copolymeryolethylene insertioniYETHYLENE POLYMERIZATIONAT("ethylene-1-hexene copolymerization0*ETHYLENEBIS(1-INDENYL)ZIRCONIUM DICHLORIDEETHYLMAGNESATIONT EXCHANGESEXCHANGE-REACTIONSSID FEMO-COFACTOR FIXATION fluorenylFLUORENYL COMPLEXESIV FLUOROCARBONS FLUXIONAL Fourier transform infrared$ FULLY SYNDIOTACTIC POLYPROPYLENEFULVALENE COMPLEXESYA fulvenemefunctionalized polyolefin GAS-PHASEgel permeationic GENERAL-SYNTHESIS GENERATIONYNT GEOMETRYTGLYOXYLATE ENERIC GRIGNARD-GRIGNARD-REAGENTSGROUND-STATE PROPERTIES L group 4ntGROUP-1 ORGANOMETALLICALC GROUP-14Y GROUP-4CE GROUP-4 METALLOCENE COMPLEXESGROUP-4 METALLOCENESVGROUP-IV METALLOCENESGROUP-IVB CATALYSTSTAne in the Cp(*)(2)TiCl2-Mg systemzChemical Communicationst Chem. Commun.H 199924 CHEM COMMUNeISI:000083995100029m 2816-2819UpjPellny, P. M. Burlakov, V. V. Baumann, W. Spannenberg, A. Horacek, M. Stepnicka, P. Mach, K. Rosenthal, U.piFacile functionalizations of permethyltitanocene dichloride to chiral persubstituted titanocene complexesOrganometallicsCOrganometallics: 20001914JUL 10 ORGANOMETALLICSISI:000088133600027is $AZ@X.t339-344.HBLongo, P. Amendola, A. G. Fortunato, E. Boccia, A. C. Zambelli, A.TNGroup 4 metallocene catalysts with hapto-flexible cyclopentadienyl-aryl ligand*#Macromolecular Rapid Communications haSYNDIOSPECIFIC STYRENE POLYMERIZATION; SYNDIOTACTIC-SPECIFIC POLYMERIZATION; COMPLEXES; ZIRCONIUMnCatalytic precursors Ti(IV) and Zr(IV) complexes bearing cyclopentadienyl and substituted cyclopentadienyl and substituted cyclopentadienyl anionic ligands, bonded to phenyl or substituted phenyl through an isopropylidene bridge have been utilized in the polymerization fo propene and styrene and in ethylene-styrene copolymerization and substituted cyclopentadienyl anionic ligands, bonded to phenyl or substituted phenyl through an isopropylidene bridge have been utilized in the polymerization of propene and styrene and in ethylene-styrene copolymerization. In the presence of trichloro [(1,2,3,4,5-eta)-1-(1-methyl-1-phenylethyl)-2,4-cyclopentadien- 1-yl] titanium (LTiCl3) we have obtained either partially isotactic (chain-end type) or atactic poly-(propylene), and either atactic or syndiotactic polystyrene depending on the reaction temperature. [1-Methyl-1-naphthylethyl-2-inden-1- yl]titanium(IV) behaves like (LTiCl3) in styrene polymerization, while it affords metal-controlled partially isotactic poly(propylene), as well as the corresponding zirconium compounds. The experimental data are tentatively explained by the temperature dependence of coordination of the bridged aryl group of the ligand.Macromol. Rapid Commun. 2001225"MAR 26 MACROMOL RAPID COMMUNISI:000167922800009 1963-1966.,&Lorber, C. Donnadieu, B. Choukroun, R.tnSynthesis and structure of group 4 and 5 metal complexes with an ancillary sterically demanding diamido ligandOrganometallicsrOrganometallicst 20001910MAY 15 ORGANOMETALLICSISI:000087021000022735-736.4.Lorberth, J. Shin, S. H. Wocadlo, S. Massa, W.haPentabenzylcyclopentadienylpotassium-3 Thf, an Organopotassium Compound with Piano Stool Geometry82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl. 1989286EJUN ANGEW CHEM INT EDLISI:A1989AF334000056611-613.,%Lorberth, J. Berlitz, T. F. Massa, W.orlPentamethylcyclopentadienylmercury Chloride - an Organomercury Compound with Novel Battlement-Like Structure82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl. 1989285NMAY ANGEW CHEM INT EDISI:A1989AB088000170437-442$Loukova, G. V. Smirnov, V. A.pf`Phosphorescent ligand-to-metal charge-transfer excited states in the group IVB metallocene triadChemical Physics LettersChem. Phys. Lett.  2000 329C 5-6OCT 27 CHEM PHYS LETTISI:000165164000017  2426-2427"Lund, E. C. Livinghouse, T.NrkRapid and Efficient Procedures for the Synthesis of Monocyclopentadienyl Complexes of Hafnium and ZirconiumOrganometallicsOrganometallics 199099SEP ORGANOMETALLICSpISI:A1990DX82200007du7.|uBurlakov, V. V. Troyanov, S. I. Letov, A. V. Strunkina, L. I. Minacheva, M. K. 6355-6361.D>Britto, M. L. Galland, G. B. dos Santos, J. H. Z. Forte, M. C.NHCopolymerization of ethylene and 1-hexene with Et(Ind)(2)ZrCl2 in hexanePolymermetallocene; MAO; ethylene-1-hexene copolymerization HOMOGENEOUS OLEFIN POLYMERIZATION; ZIEGLER-NATTA CATALYSTS; METALLOCENE; PROPYLENE; COMPLEXES; COMONOMERCopolymerizations of ethylene and 1-hexene were carried out in hexane at 60 degreesC by using ethylenebis(indenyl)zirconium dichloride as catalyst and methylaluminoxane (MAO) as cocatalyst in presence of triisobutylaluminum (TIBA). The influence of the alkylaluminum concentration and Al-TOTAL/Zr molar ratio on the catalyst activity and comonomer incorporation are evaluated. Increasing the TIBA concentration, the MAO solubility augments in the polymerization milieu, as well as the catalyst activity and the comonomer incorporation. Increasing the Al-TOTAL/Zr molar ratio, catalyst activity becomes higher, while comonomer incorporation remained constant at around 8 wt% for molar ratios between 0 and 5000. For Al- TOTAL/Zr molar ratios higher than 5,000 comonomer incorporation increased gradually. Under the same experimental conditions dimethylsilylbis(indenyl)zirconium dichloride showed higher thermal stability and led to higher comonomer incorporation. (C) 2001 Published by Elsevier Science Ltd.Polymer 20014215 JUL POLYMERISI:000168491000004243-247|uBurlakov, V. V. Troyanov, S. I. Letov, A. V. Strunkina, L. I. Minacheva, M. K. Furin, G. G. Rosenthal, U. Shur, V. B. Interaction of bis(trimethylsilyl)acetylene complex of titanocene with tris(pentafluorophenyl)borane. Synthesis and structure of a new type of zwitterionic metallocene (eta(5)- C5H5){eta(5)-[C5H4B(C6F5)(3)]}Ti*#Journal of Organometallic ChemistryJ. Organomet. Chem. 2000 5982APR 2 J ORGANOMETAL CHEMISI:0000863356000082000 28118SEP J NUCL MATERISI:0000893218000060 1494-1499n,&Kasani, A. Gambarotta, S. Bensimon, C.Zirconium alkyl and borohydride complexes stabilized by a sterically demanding anionic organic amide. The crystal structures of ZrMeL3 (2) and Zr(BH4)L-3 (3) (L = (3,5- Me2Ph)N(Ad); Ad equals adamantyl)>8Canadian Journal of Chemistry-Revue Canadienne De Chimie$Can. J. Chem.-Rev. Can. Chim. 19977511NOV CAN J CHEMISI:0000715181000081173-175 "Lappert, M. F. Raston, C. L.A Zirconocene(Iv) Chloro-Alkyl and Dialkyl Containing Chiral Alpha-Carbon Atoms, [Zr(Eta- C5h5)2(Rstar)(X)][Rstar=Ch(Sime3)C6h4me-Omicron,X=Clorrstar] - Synthesis, Stereoisomerism, and D1 Reduction Products>7Journal of the Chemical Society-Chemical CommunicationsA"J. Chem. Soc.-Chem. Commun.t 19814eJ CHEM SOC CHEM COMMUNISI:A1981LD16900019.Un 2687-2695RGell, K. I. Schwartz, J.Preparation of Zirconium(Ii) Complexes by Ligand-Induced Reductive Elimination - Bis(Eta-5- Cyclopentadienyl)Bis(Phosphine)Zirconium(Ii)Complexes and Their Reactionsn.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.. 1981 10310J AMER CHEM SOCEISI:A1981LR073000336481-488 ,&Gell, K. I. Harris, T. V. Schwartz, J.d]Synthesis and Characterization of Dimeric Zirconium(Iii) Complexes - Structure of ZirconocenewInorganic Chemistryl Inorg. Chem. 1981202 INORG CHEMISI:A1981KZ63500033a 1515-1522A Gelmini, L. Stephan, D. W.Synthesis, Characterization, and Chemistry of Titanium(Iv), Titanium(Iii), Zirconium(Iv), and Hafnium(Iv) Complexes of Phosphine Sulfides and Selenides - the Crystal and Molecular- Structures of Cp2ti(Spcy2)2, Cp2ti(S2pcy2), and Cp2ti(Se2pph2)OrganometallicsOrganometallics 198767JUL ORGANOMETALLICSISI:A1987J158900025U$bYJ[ 1445-1447i:4Fryzuk, M. D. Love, J. B. Rettig, S. J. Young, V. G.^XTransformation of coordinated dinitrogen by reaction with dihydrogen and primary silanesScienceMOLECULAR NITROGEN; HAFNIUM POLYHYDRIDES; HYDRIDE DERIVATIVES; COMPLEXES; MOLYBDENUM; ACTIVATION; CHEMISTRY; FIXATION; TUNGSTEN; HYDROGEN(!The reaction of dihydrogen with a side-on bound dinitrogen complex of zirconium was investigated, Instead of a displacement of the dinitrogen moiety, which is the common mode of reactivity, a complex containing both a bridging hydride and a bridging hydrazido unit with a nitrogen-hydrogen bond was observed. This reaction was extended to primary silanes to produce a species that contained a nitrogen-silicon bond. In addition, an intermediate in the dihydrogen addition has been structurally characterized as having a bridging dihydrogen unit.Science 1997 275 5305 MAR 7 SCIENCEISI:A1997WM08100034947-952nPIFryzuk, M. D. Giesbrecht, G. R. Johnson, S. A. Kickham, J. E. Love, J. B.nRLChelating amides of lithium. Synthesis, structure and coordination chemistry Polyhedronamide; phosphine; amine; tridentate; macrocycle; lithium COMPLEXES; DERIVATIVES; HEXAMETHYLDISILAZIDE; AGGREGATION; REACTIVITY; SOLVATION; ZIRCONIUM; HAFNIUMA limited review of the use of mixed-donor ligands that contain amides is presented. By combining amides with phosphines and amines in a chelating array, a variety of tridentate and macrocyclic ligands have been prepared. The synthesis and structures of a variety of lithium derivatives are presented since these are the typical starting materials in the preparation of transition metal? main group and lanthanide complexes that incorporate these ligand systems. It is found that the structures of these lithium derivatives depend on the nature of the other donors present in the chelating array. (C) 1998 Elsevier Science Ltd. All rights reserved. Polyhedron 199817 5-6 POLYHEDRONISI:000073069500033 4050-4058S0)Fryzuk, M. D. Jafarpour, L. Rettig, S. J.Preparation and reactivity of zirconium(III), niobium(III), and molybdenum(III) complexes stabilized by a cyclopentadienyl unit with pendant phosphine donorsnOrganometallics9Organometallics 19991820SEP 27 ORGANOMETALLICSISI:0000830335000181 4050-4058o0)Fryzuk, M. D. Jafarpour, L. Rettig, S. J.Preparation and reactivity of zirconium(III), niobium(III), and molybdenum(III) complexes stabilized by a cyclopentadienyl unit with pendant phosphine donorssOrganometallicsRvoRAY CRYSTAL-STRUCTURE; R =; DERIVATIVES; CHEMISTRY; CARBONYL; ZIRCONOCENE; CONVENIENT; HALOGENO; LINKAGE; BONDSeLFThis paper deals with the organometallic chemistry of the trivalent second-row transition metals of groups 4-6, namely, Zr, Nb, and Mo, with the cyclopentadienyldiphosphine ligand [eta(5)-C5H3-1,3-(SiMe2CH2PR2)(2)], abbreviated as [(P2Cp)-P-R] (where R = i-Pr and Ph). The Zr(IV) complex [i-PrP2Cp]ZrCl3 undergoes reduction with Na/Hg to form the trivalent Zr derivative, [i-PrP2Cp]ZrCl2, which undergoes a metathetical reaction with MeMgBr to yield the monomethyl derivative [i- PrP2Cp]Zr(CH3)Cl. The reaction of the Zr(III) complex [i- PrP2Cp]ZrCl2 with excess carbon monoxide results in disproportionation to the Zr(IV) complex, [i-PrP2Cp]ZrCl3, and the Zr(II) compound [i-PrP2Cp]Zr(CO)(2)Cl. This reaction is reversible, and upon removal of CO the starting material, [i- PrP2Cp]ZrCl2 is formed. The preparation of the diamagnetic Nb(III) complex [(P2Cp)-P-R]NbCl2 is achieved by the reaction of NbCl3(DME) with [(P2Cp)-P-R]Li. [(P2Cp)-P-R]NbCl2 complexes react with excess CO to form the CO adducts whose solid-state structures have been determined. The Nb(IV) derivatives [(P2Cp)-P-R]NbCl3 are formed via the reaction of [(P2Cp)-P- R]NbCl2 with PbCl2. These complexes can also be produced when Nb(O)Cl-3(THF)(2) is allowed to react with excess [(P2Cp)-P- R]Li. These Nb(IV) derivatives are ESR active, and their solid- state molecular structures show distorted octahedral geometries around the Nb center. MoCl3(THF)(3) reacts with [(P2Cp)-P-R]Li to generate the corresponding Mo(III) complexes [(P2Cp)-P- R]MoCl2. These compounds are low-spin, paramagnetic complexes as evidenced by their ESR spectra.Organometallics 19991820SEP 27 ORGANOMETALLICSISI:0000830335000188` Lemenovskii1989P Lemenovskii1995J Lemenovskii1996 Lemenovskii19963 Lemenovskii1998! Lemenovskii2000 Leonov2000y Letov2000 Leung1996c Leung1998 Leung1999 Lewkebandara1994 Li20000* LiableSands1996 LiableSands1997 Liang1999 Liang1999 Liang1999 Liang2000 Licht2000 Licht2000 Licht2000 Licht2000Y Lickiss1993: Linares1992 Lindner2000 Linnolahti2001 Liopis19818d Liou20000 Little20000p Liu1991 Liu1994 Liu1994 Liu1995 Liu1995o Liu1995 Liu2000s Livinghouse1990* Livinghouse1995 Llinas1988  Llinas1993= Lock19861Z Loehr1998 Lofgren2000 Lofgren2000 Longo2001 Lopez-Solera2001 Lorber20000 Lorber2000@Lorberth1989ALorberth19896 Lork199598 Lork19959 Louey2000 Loukova2000[ Love19979Y Love19989W Love19999. Love20000 Lu19941r Lubben1996{ Lubben1996{ Lubini1997s Lund1990* Lund1995 Luttikhedde2000/ Lutz19959) Lutz19979% Lutz19999C Lysenko1995BLyssenko19955 Ma19972 Macgillivray1993_ Macgillivray1993\ MacGillivray1996] MacGillivray1996V MacGillivray1999X MacGillivray1999E Mach19929f Mach1992o7 Mach1995? Mach19969# Mach19966 Mach19966 Mach19977 Mach19979 Mach19979! Mach199779 Mach19989 Mach19989 Mach19988 Mach19981 Mach199895 Mach199996 Mach19999 Mach1999r Mach19999 Mach1999 Mach19999 Mach199992 Mach2000 Mach20000 Mach20000 Mach20000$ Macias19999^ Macias19999 Mae2000 Magaud2000 Majoral20005 Mak1996c Mak1998 Mak1999 Makarov1986B Makhaev1995 Mala2000| Malinge2001Y Mallien1993Malmberg2000u Maltese1998g Manriquez1974h Manriquez1976% Mansel1996 Mansel1997 Manzanero1996 Manzanero1996h Manzanero1997 Manzanero1997d Manzanero1998W Manzanero2000 Manzoni1999_ Mao1993 Mao1995V Mao1999X Mao1999$ Marchetti1996 Marchetti1999 Marchi2000r Marin2001 Marks1995 Marks1996n Marks1999 Marks2000h Marsh1976i Marsh19768 Martin1994\g Martin19979q Martin20010 Martinez2000rMartinez-Salazar2000> Martins1997@ Martins19973 Martins1998 Maruoka2000LMarziano19977OMarziano19977 Mascellani2000Tk Mason1992W Mason1999@ Massa1989A Massa1989 Matsubayashi2000 Matsui2000I Matsukawa1998 Matsukawa20009Mattheis1997rEMattheis1997eiMattheis1997[Mattheis2000~ Mauler20011: Maxted19981 Maye1993 Maye1993 Maye19959 Maye199810 Mayer1989 Mazo19861 Mazo19881 Mazo1990McCamley2000 McConville1999 McCormack2000m McGowan1992iMcKenzie1976 McKeown2000! McNeill1997 McNeill1999 McPartlin1995= McQuillan1986Medvedev19868Medvedev19879 Meetsma1989 Meetsma1989 Meetsma1989 Meetsma1989 Meetsma1989 Meetsma1990^ Meetsma1995 Meetsma1998 Meetsma2000z Meetsma2001Mehrkhodavandi2000 Meikap20002.Melendez19959Melikhov19949 Mena198888 Mena1994 Menjon19878 Menjon19919 Mercandelli2000B Metzler1997D Meunier19919 Meunier19947 Meunier1995 Meunier19983 Meunier1998 Meunier2000 Mewis20006 Mews199598 Mews19959 Meyer2000Y Michaelidou1995 Michalik19933 Michalik19933tMihalios2001b Milius19989 Miller1984 Miller19855 Miller19899Millward2000Millward2000 Milovancev2000T Minacheva2000 Miola-Delaite2000 Mitani2000 Mitra2000 Mizuno2000 Montchamp1998j Montejano1996 Moore1981 Morawietz1994w Mori20010> Moriaty1985 Morise1993WMorokuma1999Morozova2000 Morton2000 Moulin20000 Mountford1989l Mountford1992m Mountford1992o Mountford1992c Mountford1994 Mountford1994Y Mountford1995J Mountford1996N Mountford1996 Mountford1996> Mountford1997@ Mountford1997 Mu20000 Mu20000 Mu20000 Mukherjee2000v Muller1984 Muller1988 Muller19966h Muller19971: Muller19981 Muller19988 Muller19988 Muller20002 Muller2000s Muller2001 Mulvey20000Munoz-Escalona2000. Murai2000 Murata1999 Murillo1999 Murphy1994r Murphy1996\ Murphy1996\ Murphy1997& Murphy1999{W Musaev19992 Mylvaganam1993\ Mylvaganam1996] Mylvaganam1996Z Mylvaganam1998 Naga1999Nakajima19944Nakajima19988Nakajima19999Nakajima2000{Nakajima2001ZNakamura2000? Nakano1998 Nakano2000i Nakano20000 Nakatsuka2000ZNakayama2000 Namiki20000 Nasman2000; Neander1999B Neander1999! Nedorezova2000 Negishi1980 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1983 Negishi1984i19841983 Negishi1984u1995 Miller1984 Miller1984u Miller1984 Miller1984 Miller1984 Miller19855  Miller19855s Miller19855 Miller19855 Miller19855 Miller19899 Miller19899_ Miller19899 Miller19899 Miller19899x Montchamp1998 Montchamp19988 Montchamp1998 Montchamp19986 Montchamp1998 Moore1981 Moore1981 Moore1981 Moore1981 Morise1993 Morise1993 Morise1993# Morise1993C Morise1993 Morise1993 Morise1993R Morise1993 Morise1993d Morise1993 Mountford1989l Mountford1992m Mountford1992o Mountford1992c Mountford1994Y Mountford1995J Mountford1996 Mountford1996N Mountford1996U Mountford1996> Mountford1997@ Mountford1997v Muller1984 Muller1984 Muller1984: Muller19981 Murillo1999 Murillo19998 Murillo1999p Murillo1999 Murillo1999/ Murillo1999 Murillo1999" Murillo1999! Nedorezova2000 Nedorezova2000 Nedorezova2000 Negishi1980 Negishi1980 Negishi1980 Negishi1980 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1981 Negishi1983 Negishi1983~ Negishi1983 Negishi1983 Negishi1984 Negishi1984u Negishi1984 Negishi1984 Negishi1984 Negishi1985rtL=WjU 489-498.@9Duff, A. W. Kamarudin, R. A. Lappert, M. F. Norton, R. J.,Bulky Metal Aryloxides, Arylamides, and Sulfur and Phosphorus Analogs .1. Synthetic and Chemical Studies of Titanium and Zirconium Aryloxidese:3Journal of the Chemical Society-Dalton Transactionso"J. Chem. Soc.-Dalton Trans. 19863n"MAR J CHEM SOC DALTON TRANSISI:A1986A464200004O269-271.4.Duncalf, D. J. Hitchcock, P. B. Lawless, G. A.f`Synthesis and characterisation of iodo functionalised ytterbium(II) and ytterbium(III) alkoxidesChemical Communications Chem. Commun. 199629JAN 21 CHEM COMMUNISI:A1996UG03600073347-349.4.Duncalf, D. J. Hitchcock, P. B. Lawless, G. A.The first structurally authenticated divalent lanthanide siloxide derivative, [Yb(OSiMe(2)(t)Bu)(eta(2)-dme)(mu- OSiMe(2)(t)Bu)](2))*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1996 506 1-21 JAN 11 J ORGANOMETAL CHEMISI:A1996TP33800047JDDusausoy, Y., Protas, J., Renault, P., Gautheron, B., Tainturier, G. 1978J. Organometal. Chem 157 167o 4541-45463>8Dzuba, V. A. Flambaum, V. V. Gribakin, G. F. King, W. A.2+Bound-States of Positrons and Neutral AtomsaPhysical Review A3 Phys. Rev. A 1995526nDEC PHYS REV AISI:A1995TK65200033(353-358 XREfimov, M. E. Prokopenko, I. V. Tsirelnikov, V. I. Troyanov, S. I. Medvedev, V. A.Thermodynamic Properties of Zirconium Chlorides .1. The Standard Molar Enthalpy of Formation, the Low-Temperature Heat- Capacity, the Standard Molar Entropy, and the Standard Molar Gibbs Energy of Formation of Zirconium Trichloride8("Journal of Chemical ThermodynamicsJ. Chem. Thermodyn.n 1987194nAPR J CHEM THERMODYNISI:A1987G773800003f221-235N"Eisch, J. J. Pombrik, S. I.zsThe Role of Ion-Pair Equilibria on the Activity and Stereoregularity of Soluble Metallocene Ziegler-Natta Catalystsi2+Catalyst Design for Tailor-Made Polyolefinst 199489B7Zirconium-mediated asymmetric Baeyer-Villiger oxidation Chiralityw Chirality. 200012 5-6 CHIRALITYISI:000087275400039e 5198-5200D=Bonomo, L. Toraman, G. Solari, E. Scopelliti, R. Floriani, C.S`YPorphodimethene-zirconium: A new entry into zirconium macrocycle organometallic chemistryOrganometallics Organometallics- 19991825DEC 6 ORGANOMETALLICSeISI:000084171900002 1566-15742,Bousquet, R. R. Namiki, K. C. Steimle, T. C.JDA comparison of the permanent electric dipole moments of ZrS and TiS"Journal of Chemical PhysicsJ. Chem. Phys. 2000 11304 JUL 22 J CHEM PHYSISI:0000881440000310199-203.\VBrady, F. J. Cardin, C. J. Cardin, D. J. Convery, M. A. Devereux, M. M. Lawless, G. A.leA Simplified, High-Yield Synthesis, and Crystal-Structure of [Tris(Bis(2,4,6-Triisopropylphenyl)Tin)]S*#Journal of Organometallic Chemistry-J. Organomet. Chem.f 1991 421C 2-3i DEC 24 J ORGANOMETAL CHEMSISI:A1991GZ003000099117-127Brait, A. Davis, M. E.vpAlkylation of 2-methoxynaphthalene with propylene oxide using titanium and zirconium containing molecular sieves"Applied Catalysis a-GeneralAppl. Catal. A-Gen. 2000 20401rNOV 6 APPL CATAL A-GENISI:000090028500009895-896("Braun, M. Waldmuller, D. Mayer, B.^WThe 1st Pe-Spectroscopic Investigations of Lithium, Sodium, and Potassium Tert-Butoxide82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl. 1989287bJUL ANGEW CHEM INT ED|ISI:A1989AH96700006^ 1011-1018z Braunwarth, W. Thewalt, U.F@Polynuclear CpZr(IV) and CpHf(IV) complexes with oximato bridgesNGZeitschrift Fur Naturforschung Section B-a Journal of Chemical SciencesZ.Naturforsch.(B) 1997528AUG Z NATURFORSCH SECT BISI:A1997XU37300023l429-447.4-Britovsek, G. J. P. Gibson, V. C. Wass, D. F.^WThe search for new-generation olefin polymerization catalysts: Life beyond metallocenes.'Angewandte Chemie-International EditioniAngew. Chem.-Int. Edit.C 1999384ANGEW CHEM INT EDISI:000078704200001-H :&146-156.haRep, M. Kaagman, J. W. F. Elsevier, C. J. Sedmera, P. Hiller, J. Thewalt, U. Horacek, M. Mach, K.Reactions of methyl-substituted titanocene- bis(trimethylsiiyl)acetylene complexes with acetone azine: crystal structures of (eta(5):eta(1)-C5HMe3CH2CMe2NH)(2)Ti and (C5Me5)(2)Ti(N=CMe2)*#Journal of Organometallic ChemistrycJ. Organomet. Chem.a 2000 597i 1-2N MAR 15 J ORGANOMETAL CHEMiISI:000085941200022S420-429 \UResconi, L. Balboni, D. Baruzzi, G. Fiori, C. Guidotti, S. Mercandelli, P. Sironi, A. zrac-[methylene(3-tert-butyl-1-indenyl)(2)]ZrCl2: A simple, high-performance zirconocene catalyst for isotactic polypropeneOrganometallicsiMETALLOCENE CATALYSTS; PROPENE POLYMERIZATION; OLEFIN POLYMERIZATION; CRYSTAL-STRUCTURES; HAFNIUM; PROPYLENE; ZIRCONIUM; COMPLEXES; LIGANDSbThe synthesis and propene polymerization performance of the novel rac-[CH2(3-tert-butyl-1-indenyl)(2)]ZrCl2 (2) and rac- [CH2(3-tert-butyl-1-indenyl)(2)]ZrMe2(2-Me-2) are described. The ligand precursor, bis(1-tert-butyl-3-indenyl)methane (L2), is obtained in ca. 80% conversion from the condensation of 3- tert-butylindene and formaldehyde in DMF at room temperature and is isolated as a yellow powder by washing with pentane. Red 2 is obtained in 50-60% yield and free from its meso stereoisomer by reacting an Et2O solution of the ligand dianion, (L2)Li-2(Et2O)(x), with a slurry of ZrCl4 in either pentane or toluene. Yellow 2-Me-2 is prepared in 90% yield by reaction of 2 with excess MeMgCl in toluene. Alternatively, 2- Me-2 (contaminated with about 5% of its meso isomer) can be obtained directly from the ligand L2, by reacting L2 in Et2O with 4 equiv of MeLi and then 1 equiv of ZrCl4 in toluene. Both 2 and 2-Me-2 are remarkably soluble in pentane (2, ca. 1.7 g/L; 2-Me-2, ca. 13 g/L) and toluene (2, ca. 50 g/L). 2/MAO and 2- Me-2/MAO polymerize liquid propene with good activities to highly isotactic (mmmm = 95-98%), fully regioregular polypropene with medium-high molecular weights ((M) over bar(w) = 70 000-780 000) and high melting points (T-m = 154-163 degrees C) in the T-p range 30-70 degrees C. The behavior of 2 is compared to that of the prototypical Montell zirconocene rac-[Me2C(3-t-Bu-Ind)(2)]ZrCl2 (1). 2 is the first example of a highly efficient and at the same time simple and inexpensive zirconocene catalyst for isotactic polypropene. The molecular structures of 2 and its Hf analogue (Hf-2) have been determined and compared to that of 1.eOrganometallicss 2000194 FEB 21 ORGANOMETALLICSISI:000085450800009 1454-1456a|uRittinger, S. Buchholz, D. Delvilledesbois, M. H. Linares, J. Varret, F. Boese, R. Zsolnai, L. Huttner, G. Astruc, D.mDecamethylbimetallocenesOrganometallicseOrganometallics 1992114CAPR ORGANOMETALLICS9ISI:A1992HP321000121193-198.<6Rivas-Silva, J. F. Durand-Niconoff, J. S. Berrondo, M.F@Electronic calculations on fluorides and oxides of Zr, Hf and Th&Computational Materials ScienceComput. Mater. Sci.a 2000182.AUG COMPUT MATER SCIISI:000088078800008343-352. Rodriguez, G. Bazan, G. C.zSynthesis, structural characterization, and reactivity of zirconium complexes containing trimethylenemethane-based ligands.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.  1997 119S2XJAN 15 J AMER CHEM SOCISI:A1997WC77200011and enynes as a route to aluminacycles and their conversion to cyclic organic compoundsTetrahedron LettersTetrahedron Lett. 19983917APR 23 TETRAHEDRON LETTISI:000072999900017a093-ORGN Negishi, E.TNBy Golly! Zirconium has its own mind, and it is smarter than us ... Most of us:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1998 215&APR 2 2 ABSTR PAP AMER CHEM SOCISI:0000724145000949&_z~\@TuMfS0]I]0=]SI 44444k+cxIxux#LLT\LCM#TLL6M6?~?? ~~_r6MxrMhI]???hJkfW@x9@uI9j:I 5Mj5IIWIW9~+P@ 0T@R_ PMeWRuj99=hegSS\SSS=5 r:+s ss##RV ReeeP]"O+^e+^^ N++ ^bbbx=gQVq#@QxM:J | ;xLX\9jTT(lVj_ jr\LJ|#q x)^J)sL^y.XFV 2478-2487CPIFryzuk, M. D. Duval, P. B. Mao, Sssh Zaworotko, M. J. MacGillivray, L. R.nMechanistic studies of the formation of zirconium alkylidene complexes [eta(5)-C5H3-1,3-(SiMe2CH2PPr2i)(2)]Zr=CHR(Cl) (R = Ph, SiMe3) .(Journal of the American Chemical SocietyOPENING METATHESIS POLYMERIZATION; ALPHA-HYDROGEN ABSTRACTION; METAL-CARBON BONDS; TITANIUM ALKYLIDENES; TANTALUM; NIOBIUM; LIGAND; THERMOLYSIS; TITANOCENE; CHEMISTRYRKThe reaction of [P2Cp]ZrCl3 (1) with 2 equiv of KCH2Ph generates an equilibrium mixture of alkyl complexes consisting of [P2Cp]ZrCl2(CH2Ph) (2), [P2Cp]ZrCl(CH2Ph)(2) (3), and [P2Cp]Zr(CH2Ph)(3) (4). Thermolysis of this mixture yields the alkylidene complex [P2Cp]Zr=CHPh(Cl) (5) in 85% overall yield. Kinetic studies reveal a composite mechanism that incorporates the above preequilibrium, followed by an intramolecular alpha- abstraction reaction of dibenzyl 3 which follows a first-order rate, with the rate parameters Delta H double dagger = 19(1) kcal mol(-1) and Delta S double dagger = -22(5) cal(-1) mol K- 1. A kinetic isotope effect of 3.0(5) was measured at 70 degrees C for the perdeuterated analogue [P2Cp]ZrCl(CD2C6D5)2. The reaction of 1 with 2 equiv of LiCH2-EMe3 (E = C, Si) produces a similar equilibrium mixture as observed for the benzyl analogues, consisting of [P2Cp]ZrCl2(CH2EMe3) (7), [P2Cp]Zr(CH2EMe3)(3) (8), and [P2Cp]ZrCl(CH2EMe3)(2) (9). Thermolysis of this mixture yields [P2Cp]Zr=CHEMe3(Cl) (6). A kinetic analysis conducted on 9 (E = Si) indicated a first- order reaction from which the activation parameters Delta H double dagger = 6(1) kcal mol(-1) and Delta S double dagger = - 62(5) cal mol(-1) K-1 were obtained. The results indicate that reaction rates follow the order CH2Ph > CH2SiMe3 > CH2CMe3, an exact reversal of the trend for the homoleptic Ta systems Ta(CH2R)(5). The role of phosphine coordination is discussed to account for this trend. A crystal structure determination obtained for 6b reveals an alpha-agnostic interaction and a structure analogous to that of 5.J. Am. Chem. Soc. 1999 12111MAR 24 J AMER CHEM SOCISI:000079363300019 1707-1716s^WFryzuk, M. D. Duval, P. B. Mao, Sssh Rettig, S. J. Zaworotko, M. J. MacGillivray, L. R.t~wReactivity studies of the zirconium alkylidene complexes [eta(5)-C5H3-1,3-(SiMe2CH2PPr2i)(2)]Zr=CHR(Cl) (R = Ph, SiMe3)e.(Journal of the American Chemical SocietyX-RAY STRUCTURE; ZIRCONOCENE-ALKENE COMPLEXES; METAL KETENIMINE COMPLEXES; TRANSITION-METAL; CARBON-MONOXIDE; KETENE COMPLEXES; ALPHA-OLEFINS; TITANOCENE; CHEMISTRY; TANTALUM Reactivity studies of the zirconium alkylidene complexes [P2Cp]Zr=CHR(CI) (1a, R = Ph; 1b, R = SiMe3; [P2Cp] = eta(5)- C5H3-1,3-(SiMe2CH2PPr2i)(2)) are described. The reaction of 1 with ethylene follows second-order kinetics to give the ethylene complex [P2Cp]Zr(eta(2)-C2H4)CI (2), the structure of which was determined by X-ray crystallography. Addition of acetone to 1 generates the alkene RCH=CMe2, although the anticipated Zr oxo species could not be isolated from this reaction. An insertion of CO into the Zr=C bond of 1 yields the ketene complex [P2Cp]Zr(eta(2)-C,O-OC=CHR)CI (3), while the reaction with tert-butyl isocyanide gives the analogous ketenimine complex [P2Cp]Zr(eta(2)-C,N-(BuNC)-N-t=CHR)CI (4). The structure of ketene 3a (R = Ph), determined by X-ray diffraction, exhibits the E geometry, with the position of the ketene unit with respect to the ancillary [P2Cp] ligand being opposite to that in the configuration of the precursor alkylidene la. The ketene complex 3 reacts with ethylene to give [P2Cp]Zr(eta(2)-C,O-CH2CH2C(O)=CHR)CI (5). The molecular structure of 5b (R = SiMe3) was obtained by X-ray diffraction and reveals a five-membered zirconaoxacycle arising from the insertion of ethylene into the Zr-C bond of the ketene, which is subsequently coordinated to the metal as an enolate ligand. 5 undergoes a final insertion reaction with CO to give the asymmetric eta(2)-acyl-ylide complex. For each reaction detailed above, dissociation of a labile pendant phosphine donor provides an open site for reactivity.J. Am. Chem. Soc. 1999 1218MAR 3 J AMER CHEM SOCISI:000079014500011 767-+yJCFryzuk, M. D. Jafarpour, L. Kerton, F. M. Love, J. B. Rettig, S. J."Dinuclear pi complexes of yttrium and lutetinm with sandwiched naphthalene and anthracene ligands: Evidence for rapid intramolecular inter-ring rearrangements.'Angewandte Chemie-International EditionAngew. Chem.-Int. Edit. 2000394ANGEW CHEM INT EDISI:000085476300019 1608-1613o>7Fryzuk, M. D. Duval, P. B. Patrick, B. O. Rettig, S. J.m|Synthesis and structure of the hafnium alkylidene complex [P2Cp]Hf=CHPh(Cl) ([P2Cp] = (eta(5)-C5H3-1,3- (SiMe2CH2PPr2i)(2)))Organometallics3d^MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; ZIRCONIUM; DERIVATIVES; TRICHLORIDE; BENZYL; SIME3; PHThe synthesis, structural characterization, and solution behavior of hafnium complexes stabilized by the potentially tridentate ancillary ligand [P2Cp] ([P2Cp] = (eta (5)-C5H3-1,3- (SiMe2CH2PPr2i)(2))) are described. The reaction of [P2Cp]Li with HfCl4(THT)(2) produces the hafnium trichloride complex [P2Cp]HfCl3 (1), the structure of which was determined by X-ray crystallography. Trichloride 1 is isostructural with the analogous zirconium complex [P2Cp]ZrCl3 (2) in the solid state, but in solution 1 exists as an equilibrium mixture of two isomers that interconvert by fluxional phosphine coordination. Treatment of 1 with 2 equiv of KCH2Ph, followed by thermolysis, yields the first structurally characterized hafnium alkylidene complex, [P2Cp]Hf=CHPh(Cl) (3). A crystal structure determination obtained for 3 shows this complex to be isostructural with the zirconium analogue [P2Cp]Zr=CHR(Cl) (4). The primary difference between the Hf systems presented here and the previously studied Zr analogues is that metal-ligand bonding is stronger in the former, which accounts for shorter bond distances, a greater degree of chemically inertness, and the divergent solution behaviors observed for the trichloride derivatives 1 and 2.SOrganometallics 2001208APR 16 ORGANOMETALLICSISI:000168395000016opentadienylPolyhedron, 14, 11,19951411 TIRQUG 3480-34840LEFryzuk, M. D. Hoffman, V. Kickham, J. E. Rettig, S. J. Gambarotta, S.dSynthesis and structure of a new lithium amide ligand precursor: A tridentate nitrogen-based donor set of the formula N(SiMe2CH2NMe2)(2). Synthesis and structure of the group 4 amides MCl3[N(SiMe2CH2NMe2)2] (M=Ti, Zr, Hf)Inorganic Chemistry Inorg. Chem. 19973616JUL 30 INORG CHEMISI:A1997XN69500016 Rousset1997 Rousset1998 Rouzaud2000 Royo19858 Royo19881_ Royo19909B Royo19919^ Royo19919; Royo19926 Royo1993Z Royo19939( Royo1995+ Royo19959 Royo1996j Royo1996 Royo1996g Royo1997h Royo1997 Royo1997d Royo1998W Royo2000 Royo2000 Royo20002 Royo2000 Royo2000 Royo20002 Ruchatz1998 Ruff1923 Rufin1989p Rufin1990S Rufin1990] Ruiz1999 Ruiz2000| Ruiz-Garcia2001 Rumpf2000Ruotoistenmaki2000- Rush2000* Russ19676 Russell2000 Rust2000h Ryan19929 Ryan19959 Rybakov1988a Rybakov1989 Rybakov1990 Rytter20000 Rytter200003 Saak19878 Saarenketo2000T Sabat2000 Saburi19909 Saburi19919 Saburi19919 Sacchi2000t Saggio20010 Saito2000 Saito2000 Salamatov2000 Salaun19899v Salaun19911 Sammis20000 Samuel1983 Samuel1985D Samuel199114 Sanders1998 Sanders2000h Sanner1976i Sanner1976 Sano20000X Santos20000 Sarjudeen1989_ Sarsfield1999 Sarsfield2000 Sarter1989\p Sarter1990{S Sarter1990{Sassmannshausen1999$Sassmannshausen1999%Sassmannshausen1999Sassmannshausen1999Sassmannshausen2000Sassmannshausen2000 Sato20002w Sato20010 Saunders2000! Savinov2000 Scettri2000ESchaefer1993Schaefer1994 Schamberger1993 Schamberger1993 Scharmann2000* Schattenmann19987 Schattenmann1998< Schattenmann1998 Schauwienold2000$ Schick19999^ Schick19999,Schleyer1996 Schliessburg2000 Schloss1998 Schloss2000 Schlund1989p Schlund1990S Schlund1990 Schmid1998r Schmidt1996 Schmidt1996 Schmidt1997x Schmidt2001t Schneider20014 Schnockel1996Schottek2000 Schrock1981 Schrock1981p Schrock1991S Schrock1996E Schrock1997( Schrock1998* Schrock1998. Schrock19981 Schrock19987 Schrock19989 Schrock1998< Schrock1998  Schrock1999 Schrock1999 Schrock1999 Schrock1999 Schrock1999 Schrock1999 Schrock1999& Schrock1999 Schrock2000 Schrock2000 Schrock2000 Schrock2000 Schrock2000 Schrodi1999 Schrodi2000v Schroth1984t Schroth1985 Schultz1996Schumann20000Schwartz1981Schwartz1981@Schweder19964Schweder19997Schweder1999e Scopelliti1999h Scopelliti1999c Scopelliti2000m Scott1992 Scott2000 Scowen19959W Sebastian2000? Sedmera1996 Sedmera1996 Sedmera1997 Sedmera1998 Sedmera2000$ Segre1996 Seidel19999W Seidel19999 Seidel20000 Seki19900 Sen2000Sengupta20000Sengupta20000 Seppala2000 Seppala2000 Seppala2000 Seppala2001 Serrano1988Shaltout1995Shaltout1996 Shang1991 Shang1991 Shang1992 Shang1994D Sheldrick1991Sheridan19941B Shestakov1995C Shestakov1995r Shi1998j Shi1999 Shi20007 Shibata1992B Shilov19959C Shilov19959D Shilov19959@ Shin19891` Shiono1999 Shiono1999 Shiono2000 Shur19931 Shur19931 Shur19941 Shur2000 Shur2000rm Sikora1979k Sikora1984 Silong20000Silveira19800 Sim1971 Simonov1986m Simpson1992' Singh1987 Sinnema2000 Sironi2000 Sisak2000a Sita1999 Sita2000Sitzmann19949 Sivik19947 Sivik1995 Skelton1984 Skelton1997} Skibbe1983 Slebodnick2000 Slebodnick2000 Smeets19901 Smirnov2000Y Smith1993 Smith2000 Soares2000 Soga19999 Soga20000 Solari19979t Solari19989t Solari19989u Solari1998w Solari1998oe Solari19999h Solari1999k Solari19999l Solari19999o Solari19991c Solari20000 Soleil F1997 Sommer20000 Somoza2000 Somoza20000 Sone2000} Song19901c Song19988 Sorkau2000H Sostero1997 Sostero20004 Souter19988 Spaniol1997 Spaniol2000 Spannenberg1996 Spannenberg1998 Spannenberg1999 Spannenberg1999 Spannenberg19992 Spannenberg2000 Spannenberg2000 Spannenberg2000 Spannenberg2000 Spannenberg2000 Spek19899 Spek1990a Spek1990a# Spek19961 Srivastava2000 Srivastava2000TD Stalke1991EStammler1997rStammler19977Stammler200107Stammler20010sStammler2001Z Stauffert1985 Steimle2000 Stein1993 Steiner1996U Stephan1987S Stephan1988H Stephan1991H Stephan1991L Stephan1991M Stephan1991 Stephan1992& Stephan1993 Stephan1993A Stephan1993E Stephan1995F Stephan1995G Stephan1995 Stephan2000jStephens19925 Stepnicka1999 Stepnicka1999 Stepnicka1999 Stepnicka19992 Stepnicka2000 Stepnicka2000n Stern1999 Stoebenau2000] Stollmaier1981d Stone1986@ Stone1995Stovneng20000Stovneng2000C Strahle1991) Straub1997 Strauch20001 Streitwieser1993 Streletskii2000hStrenger19979B Struchkov1995C Struchkov1995 Strunkina2000V Stucky1979 Stumpf19999 Stumpf19999 Stumpf19999HSturmann19989Sugihara1997< Suh1992V Suib19797Sukhovei19868` Summerville1976 Sun2000 Suzuki19919 Suzuki19919 Suzuki19933 Suzuki19949 Suzuki19989 Swain1987 Swanson1987 Swanson1991 Taber2000 Tabet2000 Tachimori2000 Tahara2000= Tainturier1978 Takagi1991 Takahashi1986 Takahashi1987 Takahashi1989 Takahashi1990 Takahashi1991 Takahashi1991 Takahashi1993 Takahashi1994 Takahashi1994 Takahashi1995 Takahashi1996 Takahashi1997 Takahashi1998 Takahashi1998 Takahashi1998 Takahashi1999 Takahashi2000 Takahashi2000{ Takahashi2001ITakaishi1998 Tamura2000i Tanaka20000 Tangen2000MTanigaki19977( Tanner1997Tarafder2000' Taylor19871e Taylor1998 Taylor2000 Taylor2000 Taylor20000ETerpstra1992Terreros20000P Teuben1989[ Teuben19959^ Teuben19959 Teuben19988z Teuben20011] Thewalt1981[ Thewalt1983Z Thewalt1985X Thewalt1986W Thewalt1987M Thewalt1988T Thewalt1988 Thewalt1988 U l<0,Journal of Physical Chemistry J. Phys. Chem.40Journal of Physical Chemistry B J. Phys. Chem. B@;Journal of Physics-Condensed Matter J. Phys.-Condes. Matter<8Journal of Polymer Research-Taiwan J. Polym. Res.-TaiwanPMJournal of Polymer Science Part a-Polymer Chemistry J. Polym. Sci. Pol. Chem.85Journal of Solid State Chemistry J. Solid State Chem.LFJournal of Synthetic Organic Chemistry Japan J. Synth. Org. Chem. Jpn.@:Journal of the American Chemical Society J. Am. Chem. Soc.HEJournal of the Atomic Energy Society of Japan J. At. Energy Soc. Jpn.XUJournal of the Chemical Society-Chemical Communications J. Chem. Soc.,Chem. Commun. XRJournal of the Chemical Society-Dalton Transactions J. Chem. Soc., Dalton Trans. @;Journal of the Japan Institute of Metals J. Jpn. Inst. Met.,(Koordinatsionnaya Khimiya Koord. Khimiya(%Korea Polymer Journal Korea Polym. J.@;Macromolecular Rapid Communications Macromol. Rapid Commun.,'Macromolecular Symposia Macromol. Symp.g Macromolecules Macromolecules82Magnetic Resonance in Chemistry Magn. Reson. Chem.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.0,Materials Transactions Jim Mater. Trans. JIM4/Metalloorg. Khim (Organometallic Chem. in USSR)40Metalloorg. Khim. (Organometallic Chem. in USSR)Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.0,Metals and Materials-Korea Met. Mater.-KoreaPKMetastable, Mechanically Alloyed and Nanocrystalline Materials, Pts 1 and 2D@Molecular Crystals and Liquid Crystals Mol. Cryst. Liquid Cryst.$ Molecular Simulation Mol. Simul.$Organometallics Organometallics($Organometallics, VL-3, PG-18,YR-1984`]Phosphorus Sulfur and Silicon and the Related Elements Phosphorus Sulfur Silicon Relat. Elem.Physica E Physica E$Physical Review A Phys. Rev. A@:Physical Review C-Nuclear Physics Phys. Rev. C-Nucl. Phys.Polimery PolimeryPolyhedron PolyhedronPolymer PolymerPrivate Communication0+Pure and Applied Chemistry Pure Appl. Chem.LFRapid Communications in Mass Spectrometry Rapid Commun. Mass Spectrom.Recueil Des Travaux Chimiques Des Pays-Bas-Journal of the Royal Netherlands Chemical Society Recl. Trav. Chim. Pays-Bas-J. Roy. Neth. Chem. Soc.0+Russian Chemical Bulletin Russ. Chem. Bull.Science ScienceY(%Solid State Sciences Solid State Sci.Synlett SynlettliSynthesis and Reactivity in Inorganic and Metal-Organic Chemistry Synth. React. Inorganic Met.-Org. Chem. Synthesis-Stuttgart SynthesisTetrahedron Tetrahedron)(%Tetrahedron Letters Tetrahedron Lett.0,Tetrahedron-Asymmetry Tetrahedron: Asymmetry$!Thin Solid Films Thin Solid Films4.Transition Metal Chemistry Transit. Met. Chem. Vestn.Mosk.Univ.,Ser.Khim.kgXUVestnik Moskovskogo Universiteta Seriya 2 Khimiya Vestn. Mosk. Univ. Seriya 2 KhimiyaZ. Naturforsch. BZ.Anorg.Allg.Chem.LHZeitschrift Fur Anorganische Und Allgemeine Chemie Z. Anorg. Allg. Chem.XTZeitschrift Fur Kristallographie-New Crystal Structures Z. Krist.-New Cryst. Struct.\YZeitschrift Fur Naturforschung Section B-a Journal of Chemical Sciences Z.Naturforsch.(B)4.Zhurnal Fizicheskoi Khimii Zhurnal Fiz. Khimii84Zhurnal Neorganicheskoi Khimii Zhurnal Neorg. Khimii Khimii y2 Vicart, N. Vidal, H.Villalta, O. A.Villalta, O.A.Villasenor, E. Visser, C. Vlassov, M. Vogel, P. Voigt, A.Vollmerhaus, R. Vondrak, T.Voskoboynikov, A. Z. Wailes, P. C.Waldman, T. E.Waldmuller, D. Walker, N. M. Walker, N. W. Wallstein, R.Walters, M. A. Walther, D. Wang, J. H. Wang, Q. G. Wang, Q. Y. Wang, Q. Z. Wang, X. F. Wang, Y. Wang, Ziyun Warnecke, A. Warren, T. H. Wass, D. F. Watanabe, K. Watt, G. W Waugh, M. P.Waymouth, R. M. Webb, A. D. Wee, D. J. Weeber, A.Weidenbruch, M. Weigold, H. Weiss, E. Wells, N. J.,(Wells, N. J. Huffman J. C. Caulton K. G. Wells, N.J.Wengrovius, J. H. Werner, R. Wessel, J. Whang, D. Whitby, J. White, A. H. White, A.H. Wibbeling, B. Wicher, J. Wielstra, Y. Wigum, H.Wilcock, D. J. Wilen, C. E. Wilkinson, G. Willey, G.R.Williams, E. F.Williams, V. C.Wingbermuhle, D. Winter, C. H.Winterborn, D. J. W. Wipf, H.Wiseman, P. J. Witte, P. T. Wloka, M. Wocadlo, S. Wojcicki, A.Wojtczak, W. A.Wolczanski, P. T. Wolf, W.Wolmershauser, G. Wong, L. L. Wong, W. K. Wong, W. T. Woo, H. G. Woo, L. K.Wrackmeyer, B. Wu, Z. Wurst, K. Xi, C. J. Xi, Z. F. Xiao, L. Xie, J. Xin, S. X. Xu, C. D. Xue, F. Xy, C. Yamada, S. Yamazaki, A. Yamazaki, H. Yan, D. Yan, X. F. Yang, G. D. Yano, A.Yarrow, P. I. W. Yasin, T. Yasuda, Y. Yin, J. G. Yonemoto, T. Yoon, J. S. Yoshida, S. Yoshida, T. Yoshimura, T. Young, V. G. Ystenes, M. Yu, P. H. Yuchi, A. Yuen, P. Yun, S. S. Zaegel, F. Zahn, G. Zaima, S. Zak, Z. Zambelli, A.Zanotti-Gerosa, A.Zaworotko, M. J. Zemanek, J. Zhai, H. M. Zhang, F. Zhang, H. Zhang, L. L. Zhang, L. N. Zhang, S. Zhang, W. Zhang, X. W. Zhang, Y. T. Zhao, J. S. Zhao, L. G. Zhou, P. Zhou, X. X. Zhu, C. J. Zhu, Q. M. Zhu, S. S. Zhu, X. H.Ziegler, M. L. Ziller, J. W.Ziotkowski, J. J. Zippel, F. Zsolnai, L. Zucchi, D.s of C13H9B(C6F5)(2)center dot t-BuNH2,C13H8SiMe3B(C6F5)(2), and {eta(5)-C5H4B(C6F5)(2)}TiCl3zOrganometallicseOrganometallicsy 19971623NOV 11 ORGANOMETALLICSISI:A1997YH465000118 5479-5480c@9Duff, A. W. Jonas, K. Goddard, R. Kraus, H. J. Kruger, C.B;The 1st Triple-Decker Sandwich with a Bridging Benzene-Ring..(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1983 10516J AMER CHEM SOCPISI:A1983RC16600050S E ,z9j!| N^WVarga, V., Mach, K., Polasek, M., Sedmera, P., Hiller, J., Thewalt, U., Troyanov, S. I. 1996Titanocene-bis(trimethylsilyl)acetylene complexes: effects of methyl substituents at the cycloepentadienyl ligands on the structure of thermolytic products*#Journal of Organometallic Chemistry: 5068241-251U 63-74.RLVarga, V. Hiller, J. Gyepes, R. Polasek, M. Sedmera, P. Thewalt, U. Mach, K.Synthesis, crystal structures and some properties of dimethylsilylene-bridged ansa-permethyltitanocene [Ti(IV), (III) and (II)] complexes*#Journal of Organometallic Chemistry(J. Organomet. Chem.[ 1997 538 1-2 JUN 20 J ORGANOMETAL CHEM0ISI:A1997XJ886000085251-259.0*Varga, V. Petrusova, L. Cejka, J. Mach, K.Permethyltitanocene(III) diacetylide magnesium tweezer complexes, intermediates in the catalysis of linear head-to- tail dimerization of terminal acetylenes*#Journal of Organometallic ChemistrylJ. Organomet. Chem.g 1997 5323 1-2-APR 1 J ORGANOMETAL CHEMISI:A1997XF42900030n 15-22.<5Varga, V. Hiller, J. Thewalt, U. Polasek, M. Mach, K.a}Synthesis and crystal structure of a zirconium(III) diacetylide tweezer complex: [(eta(5)-C5HMe4)(2)Zr(eta(1)-C CSiMe3)(2)]K+f*#Journal of Organometallic ChemistrymJ. Organomet. Chem. 1998 553G 1-2C FEB 25 J ORGANOMETAL CHEM8ISI:0000737646000021 1955-1959n Vathauer, M. Kaminsky, W..XRHomopolymerizations of alpha-olefins with diastereomeric metallocene/MAO catalystsMacromolecules*#POLYOLEFINS; DERIVATIVES; PROPYLENE1-Butene and l-pentene were polymerized with three different metallocenes: dimethylsilyl-bis(2-methyl-4,5- benzoindenyl)zirconium dichloride [Me2Si(2-Me-4,5- BzoInd)(2)ZrCl2] (1), dimethylsilylbis(2-methyl-4- phenylindenyl)zirconium dichloride [Me2Si(2-Me-4- PhInd)(2)ZrCl2] (2), and dimethylsilylbis(indenyl)zirconium dichloride [Me2Si(Ind)(2)ZrCl2] (3). The polymerizations were conducted with the rac-isomers of the metallocenes and mixtures of the rac- and meso-systems far 1 and 2 and with the meso-form of catalyst 3 combined with MAO. It was shown that the activities in the polymerization of the alpha-olefins of the meso-isomers of 1 and 2 were much higher than those of the rac- metallocenes, while a vice versa behavior is observed for catalyst 3. Additionally, reaction profiles of 1 and 2 were recorded which underline that the stability of their meso- compounds is much higher than that of the rac-systems for the polymerization of the investigated monomers.Macromolecules 2000336MAR 21 MACROMOLECULESISI:000086073300009Vicart, N., Whitby, J. 1999^WSynthesis of carbocycles by insertion of 1,1-dihalo-1-lithio species into zirconacyclestChemical Communications} 1241-1242d 1620-1628 JDVisser, C. van den Hende, J. R. Meetsma, A. Hessen, B. Teuben, J. H.tmPentamethylcyclopentadienyl zirconium and hafnium polyhydride complexes: Synthesis, structure, and reactivity OrganometallicsbX-RAY STRUCTURE; CYCLIC HYDROBORATE COMPLEXES; ANIONIC ZIRCONOCENE TRIHYDRIDE; CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; HYDRIDE DERIVATIVES; EXCHANGE-REACTIONS; PHOSPHINE-LIGANDS; ALKYL; METALLOCENESThe half-sandwich zirconium and hafnium N,N-dimethylaminopropyl complexes Cp*M-[(CH2)(3)NMe2]Cl-2 (Cp* = eta (5)-C5Me5, M = Zr, 1; Hf, 2) and Cp*M[(CH2)(3)NMe2](2)Cl (M = Zr, 3; Hf, 4) were synthesized by mono- or dialkylation of Cp*MCl3 with the corresponding alkyllithium and Grignard reagents. Hydrogenolysis of the monoalkyl species resulted in the formation of the polyhydride complexes CP*M-3(3)(mu -H)(4)(mu - Cl)(2)Cl-3 (M = Zr, 5; Hf, 6) and Cp*MCl3. A crystal structure determination of CP*3Hf3H4Cl5 (6) revealed a fully asymmetric trinuclear structure with three widely differing Hf Hf distances. Reaction of CP*3M3H4Cl5 with PMe3 resulted in fragmentation of the cluster and ligand redistribution to give Cp*MC3(PMe3) and the dimeric hydride complexes Cp*M-2(2)(mu - H)(3)Cl-3(PMe3) (M = Zr, 7; Hf, 8), structurally characterized for M = Zr. The trinuclear polyhydride CP*3Hf3H4Cl5 reacts with 2,6-xylylisocyanide to give three distinct products, a mu - enediamide complex, [Cp*HfCl2](2)[mu -xyNCH=CHNxy] (11, xy = 2,6-dimethylphenyl), which was structurally characterized, an imido complex, [Cp*Hf(mu -Nxy)Cl](2) (12), and an azaallyl species, Cp*Hf(eta (3)-CH(2)CHNxy)Cl-2 (13). The reactivity of 6 can be interpreted as proceeding through initial cleavage of the trinuclear complex into the fragments "Cp*Hf-2(2)(mu - H)(3)Cl-3" and "Cp*HfHCl2", followed by the separate reactivity of these fragments.Organometallics 2001208gAPR 16 ORGANOMETALLICSISI:000168395000018 2161-2169TNVollmerhaus, R. Rahim, M. Tomaszewski, R. Xin, S. X. Taylor, N. J. Collins, S.JDEthylene polymerization using beta-diketimine complexes of zirconiumOrganometallicsOrganometallics 20001911MAY 29 ORGANOMETALLICSISI:000087292200015n 27-39H2+Vondrak, T. Mach, K. Varga, V. Terpstra, A. Frontier Occupied Orbitals in Methyl-Substituted Fulvene and Dimethylenecyclopentenyltitanium Complexes by Uv-Photoelectron Spectroscopy and Eht Calculationsl*#Journal of Organometallic ChemistryJ. Organomet. Chem.  1992 425 1-2: FEB 25 J ORGANOMETAL CHEMJISI:A1992HJ16400004S=@>|e Wailes, P. C., Weigold, H. 1971^WPreparation of low oxidation state cyclopentadienyl complexes of titanium and zirconiumJ. Organometal. Chem28 91-95u I. Compounds of zirconium316-318THAWalters, M. A. Lam, K. C. Damo, S. Sommer, R. D. Rheingold, A. L.A neutral trizirconium cluster with chelating and exobidentate dialkoxide groups. The synthesis and crystal structure of Zr- 3(mu(3)-O)-(DMPD)(4)(DMPDH)(2) (DMPDH2=2,4-dimethylpentane-1,4- diol)("Inorganic Chemistry CommunicationsInorg. Chem. Commun. 200036JUN INORG CHEM COMMUNISI:000087937800013 1389-1393IB7Walther, D. Fischer, R. Gorls, H. Koch, J. Schweder, B.iOrganozirconium compounds with inorganic donor ligands N,N'- bis(trimethylsilyl)benzamidinate (Siam) in compounds of the type (Siam)(2)ZrX(2) (X=methyl, benzyl, allyl, chloride or iodide) and (Siam)(3)ZrX (X=chloride)*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1996 508  1-2FEB 8 J ORGANOMETAL CHEMISI:A1996TW16600003 1125-1130m0)Walther, D. Ritter, B. Gorls, H. Zahn, G.An unusual trimeric bimetallic Li-Zr complex with the backbone [Zr-3(mu(2)-OH)(3)(mu(3)-O)Li-5] by reaction of zirconiumorgano and hydrido complexes with water82Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem.r 1997 623s7rJUL Z ANORG ALLG CHEMlISI:A1997XJ55600019t| y$093-ORGN Negishi, E.TNBy Golly! Zirconium has its own mind, and it is smarter than us ... Most of us:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1998 215&APR 2 2 ABSTR PAP AMER CHEM SOCISI:0000724145000949 8-20RLNegishi, E. Rousset, C. J. Choueiry, D. Maye, J. P. Suzuki, N. Takahashi, T.Zirconium-catalyzed and zirconium-promoted cyclization reactions of non-conjugated dienes with alkylmagnesium halides to give cycloalkylmethylmagnesium derivativeswInorganica Chimica Acta zirconium-catalyzed; cyclization reactions; non-conjugated dienes ZIRCONOCENE-ALKENE COMPLEXES; TRANSITION-METAL CATALYSIS; CARBON BOND FORMATION; CONTROLLED CARBOMETALATION; GRIGNARD- REAGENTS; CONVENIENT PROCEDURE; MAGNESIUM REAGENTS; ETHYLENE COMPLEX; ALKYL ALKENE; ENYNESThe stoichiometric reaction of certain non-conjugated dienes with n-Bu2ZrCp3 provides the corresponding zirconabicycles, such as trans-3-bis( cyclopentadienyl) zirconabicyclo [3.3.0] octane, that can be fully characterized by spectroscopic means. Their treatment with EtMgBr or n-BuMgCl in THF gives The corresponding monocyclic monomagnesium derivatives along with the corresponding alkene-ZrCp2 derivatives in high yields. In cases where the Grignard reagent is either sterically hindered or lacking P-HI little or no reaction may occur, although some, e.g., s-BuMgCl, react, albeit slowly, to give the expected products in high yields. In cases where either a Grignard reagent in diethyl ether or a dialkylmagnesium (irrespective of solvent) is used, the major product is the corresponding dimagnesio derivative. A couple of intramolecular transmetallation paths are proposed for these cases. The Cp2ZrCl2-catalyzed reaction of 1,6-heptadiene with EtMgBr fails to induce the desired bicyclization-ring opening sequence to give the corresponding monocyclic monomagnesium derivatives. On the other hand, the corresponding reaction with n-BuMgBr does proceed as desired to give the monocyclic monomagnesium product which contains a minor amount of the corresponding exo- methylene derivative. Only traces, if any, of the corresponding dimagnesium derivatives reported to be the major products in Et2O are formed. This procedure has been applied to catalytically convert several other dienes, i.e., (E)-1-phenyl- 1,6-heptadiene, 2,4,4-trimethyl-1,6-heptadiene, diallyl (benzyl) amine, 1,7-octadiene and 1,2-diallylbenzene, into the corresponding monocyclized compounds in moderate to excellent combined yields. (C) 1998 Elsevier Science S.A. All rights reserved.Inorg. Chim. Acta 1998 280 1-2OCT 15 INORG CHIM ACTAISI:000076202900003755-769. Negishi, E. Takahashi, T.ljcAlkene and alkyne complexes of zirconocene. Their preparation, structure, and novel transformations0)Bulletin of the Chemical Society of JapanMETAL-PROMOTED CYCLIZATION; CARBON BOND FORMATION; CONTROLLED CARBOMETALATION; ORGANIC-SYNTHESIS; KETENE COMPLEXES; ALKENYLZIRCONIUM DERIVATIVES; NONCONJUGATED DIENES; CONVENIENT PROCEDURE; ZIRCONIUM REAGENTS; HYDRIDO COMPLEXES\UDialkylzirconocenes in situ generated such as Cp2Zr(n-Bu)(2), Cp2ZrEt2, and Cp2Zr(t-Bu)(i-Bu) are thermolyzed to afford zirconocene-alkene complexes. In the cases of Cp2Zr(n-Bu)(2) and Cp2Zr(t-Bu)(i-Bu), Cp2Zr-alkene complexes generated from them tend to act as a "Cp2Zr" equivalent, since the initially generated alkene is often replaced by another re-bond containing compound. In the presence of alkynes, for example, alkyne complexes may be generated. On the other hand, Cp2Zr(ethylene) tends to serve as an intermediate since the ethylene moiety is often incorporated in the final organic products. Ring expansion and contraction, ligand substitution, transmetallation, migratory insertion, stereoisomerization, regioisomerization, oxidative addition involving these Cp2Zr- alkene and Cp2Zr-alkyne complexes as well as their structures are reviewed.Bull. Chem. Soc. Jpn. 1998714APR BULL CHEM SOC JPNISI:000073796400001 $} c9`S8zBm 693-703.`ZWang, Q. Y. Quyoum, R. Gillis, D. J. Tudoret, M. J. Jeremic, D. Hunter, B. K. Baird, M. C.4.Ethylene, styrene, and alpha-methylstyrene polymerization by mono(pentamethylcyclopentadienyl)(Cp(*)) complexes of titanium, zirconium, and hafnium: Roles of cationic complexes of the type [Cp*MR(2)](+) (R=alkyl) as both coordination polymerization catalysts and carbocationic polymerization initiatorsOrganometallicsOrganometallics 1996152JAN 23 ORGANOMETALLICSISI:A1996TR68300028 1434-1440 Wang, Q. Z.tmDehydrocoupling reactions of hydrosilanes with group 4 metallocenes Cp2MY2 (M = Ti, Zr, Hf; Y = F, OPh, NMe2)>8Canadian Journal of Chemistry-Revue Canadienne De Chimie$Can. J. Chem.-Rev. Can. Chim. 20007811NOV CAN J CHEMISI:000165187900011 1434-1440Wang, Q. Z. Corey, J. Y.tmDehydrocoupling reactions of hydrosilanes with group 4 metallocenes Cp2MY2 (M = Ti, Zr, Hf; Y = F, OPh, NMe2)c>8Canadian Journal of Chemistry-Revue Canadienne De Chimie metallocene; dehydrocoupling; polymerization; hydrosilanes; polysilane BOND METATHESIS MECHANISM; POLYSILANE HIGH POLYMERS; PRIMARY ORGANOSILANES; CATALYST PRECURSORS; HYDRIDE COMPLEX; PRIMARY SILANES; POLYMERIZATION; TITANOCENE; DEHYDROPOLYMERIZATION; ZIRCONIUM Dehydrocoupling polymerization of phenylsilane with group 4 metallocene precatalysts Cp2MY2 (M = Ti, Zr, Hf; Y = F, OPh, NMe2) under comparable conditions has been examined. All nine title metallocenes produced polysilane products which ranged in molecular weight from 1100 to 4400 and exhibited ratios of linear to cyclic products from similar to2 to 30. The highest molecular weight polysilanes observed for each metal were obtained from Cp2M(NMe2)(2) and the highest percentage of linear polysilane was found with Cp2Hf(NMe2)(2). The near stoichiometric reactions of Cp2MY2 with PhSiH3, PhMeSiH2, and Ph2MeSiH were monitored by H-1, F-19 and Si-29 NMR spectroscopy and in all cases exchange products containing Si-Y were identified. Metal hydride species could be observed only with Cp2TiY2.$Can. J. Chem.-Rev. Can. Chim. 20007811NOV CAN J CHEMISI:000165187900011562-569 0)Warren, T. H. Schrock, R. R. Davis, W. M.|vSynthesis of group 4 organometallic complexes that contain the bis(borylamide) ligand [Mes(2)BNCH(2)CH(2)NBMes(2)](2-)OrganometallicsOrganometallics 1996152bJAN 23 ORGANOMETALLICSISI:A1996TR68300013n308-321 0)Warren, T. H. Schrock, R. R. Davis, W. M.Neutral and cationic group 4 complexes containing bis(borylamide) ligands, [R2BNCH2CH2NBR2](2-) (R = 2,4,6-i- Pr3C6H2, M = Zr; R = cyclohexyl, M = Ti, Zr, Hf)OrganometallicsAOrganometallics 19981737FEB 2 ORGANOMETALLICSTISI:0000718577000090& Watt, G. W, Drummond, F. O., Jr. 1970>7The Cyclopentadienyl of Titanium, Zirconium and Hafniumn*$Journal of American Chemical Society924r826-8280*Wells, N. J. Huffman, J. C. Caulton, K. G. 1981Trichloro-(eta$5!-cyclopentadienyl)-(1,2-dimethoxyethane-O,O')-zirconium(iv) bis(mu!2$-Chloro)-tetrachloro-bis(eta$5!-pentamethyl-cyclopentadienyl)-di-zircon)J.Organomet.Chem.- 213y C17n MEOTZR POSZIGC17-C20s0*Wells, N. J. Huffman, J. C. Caulton, K. G.2,Monocyclopentadienyl Zirconium(Iv) Complexes*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1981 2132J ORGANOMETAL CHEMISI:A1981LW24100014319-327 & Wengrovius, J. H. Schrock, R. R.\VAttempts to Prepare Alkylidene Zirconium Complexes by Alpha- Hydrogen Atom Abstraction*#Journal of Organometallic ChemistryJ. Organomet. Chem.1 1981 2053 J ORGANOMETAL CHEMISI:A1981LA01000005o)f Abboud1993@ Abel1995 Agarkov2001 Agreda19868 Ahn20007 Aida19929 Aitola2000a* Aizenberg1998< Aizenberg1998 Akimoto2000Al-Ahmad1999Al-Juaid1999! Aladyshev2000 AlAhmad1996 AlAhmad1997& Albers1999{WAlbinati1999Albrecht1989rpAlbrecht1990rSAlbrecht1990rAlbright2000 Alcock2000 Ali2000d Alt1974X Alt1986W Alt1987M Alt1988D Alt1993 Alt1998 Alt2000 Alt2000 Alt2000 Alt2000 Alt2000 Alt2001Amendola2001h Amor1997 Amor1997 Anastasia1998!Andersen1997Anderson2000v Angermund1984 Ansari20000 Anson1999lAntinolo1984'Antinolo1987Antinolo1989]Antinolo1999XAntinolo2000Antinolo2001B Antipin1995C Antipin1995@ Antonelli1997f Antropiusova1992 Aoyagi19939 Aoyagi19979\ Arevalo1999. Arif1995uJ Armes1997 Armstrong2000 Arndt1995 Arndt1996 Arndt1996 Arndt2000 Arndt2000( Arnold1989n Arnold19944a Arnold1999 Asao20000 Ashe1996 Ashe1997 Ashe1999Ashworth1986Ashworth1986: Astruc19922gAtovmayn19877m Atwood19790 Atwood19811R Atwood1981z Atwood1983 Atwood19891Y Avent1993 Azahari2000 Babaiankibala1991 Babel2000 Babkina2000a Babock19993Baerends1993% Bagrov19989x Bai2001m Baird1996_ Baird1999 Baker2000 Balboni2000s Bandy1991 Bandyopadhyay2000 Barat20009 Barlow1997 Baruzzi2000W Basch1999 Bashkin1981 Basile1985t Basset20010| Basset20011 Bastug2000md Bates19864 Baum19961 Baumann1994 Baumann1995 Baumann1995 Baumann1995 Baumann1996 Baumann1996 Baumann1996E Baumann1997 Baumann19971 Baumann1998 Baumann1998 Baumann1999 Baumann1999 Baumann1999 Baumann1999 Baumann1999 Baumann19992 Baumann2000 Baumann2000 Baumann2000 Baumann2000 Baumann2000 Baumann2000| Bayard20010 Bazan1994 Bazan1994 Bazan1996 Bazan1997 Bazan1999 Bazan2000 Bazan2000 Bazan2000~ Bazan2001B Bazhenova1995C Bazhenova1995D Bazhenova1995Beckhaus19988 Beckman20008 Behrens1995> Behrens1996' Behrens1997; Behrens1999B Behrens1999 Beletskaya2001 Bellabarba1999 Beltran-Porter2000C Benard1991 Benard1992 Benard19944 Benard1995h Benech1999H Benetollo1997\ Benito19999v Benn1984t Benn19855 Benn19899p Benn19909S Benn19909> Benning1985 Bensch2000Bensimon19919Bensimon19979g Bercaw19749h Bercaw19769i Bercaw19767 Bercaw19821E Bercaw19939 Bercaw19949J Bercaw1999 Berdonosov1994 Berestetskaya2000 Berezovskii1986| Berg19822v Berg19844w Berg1984t Berg19855 Bergander2000! Bergman1997 Bergman1999 Bergstrom2000T Berhalter1988 Berke1997 Berke2000A Berlitz1989Berrondo2000fp Bigorne1976n Bigorne1977 Billodeaux2000 Billodeaux2000 Binet2000 Birmingham1953Q Blackburn1988R Blackburn19889 Blandy19929Blaurock2000 Blosser2000 Bo19951 Boccia20010Bochmann19971Bochmann19971Bochmann19971fBochmann1998Bochmann1998$Bochmann1999Bochmann1999eBochmann1999Bochmann2000: Boese1992 Bolm2000 Bonitatebus2000 Bonitatebus2000  Bonitatebus2000e Bonomo1999h Bonomo19993 Borzov19988' Borzov1998{p Bouquet1976n Bouquet1977Bousquet2000; Boyle1992< Boyle1992 Brackemeyer2000Braddockwilking1992\ Brady1991 Brady2000 Brait2000 Brammer19952Brandsma19910 Braun1989; Braunwarth1997 Bravaya2000 Bravaya2000 Bravaya2000& Breen1993G Breen1995 Bridgewater2000% Brintzinger1996 Bristow1989 Britovsek1999u Britto2001| Broyer20010 Bruser20000 Bu20000 Bu20000 Bu20000:Buchholz19922 Buono2000Burkalov1996Burkalov1998 Burlakov19933 Burlakov19933 Burlakov19933Burlakov19944Burlakov19955Burlakov1995Burlakov1995Burlakov1996Burlakov19999Burlakov19999Burlakov199992Burlakov2000Burlakov2000Burlakov2000Burlakov2000Burlakov20000Burlakov2000Burlakov20000B Buschmann1999 Bush1971JButakoff1996Butakoff1996\R Bynum19817 Bzowej19955 Cacciola1992H Calderazzo1990C Calderazzo1991= Calderazzo1992$ Calderazzo1996 Calderazzo1999 Caldes20000 Campana1996Campbell1989Campbell20006 Cano1993( Cano1995 Cano1996( Cardin1986\ Cardin1991\ Cardin19916 Cardin19939( Cardin19959k Carpenetti1996l Carpenetti1996V Carpenetti2000T]Carrillo-Hermosilla1999XCarrillo-Hermosilla2000|Carrillo-Hermosilla2001` Carter1992' Carty19879 Cary19979N Casarin1989 Caselli1997c Caselli2000 Casey2000 Cassani1998H Cassani1998 Cassani1999 Cassoux2000o Castellano1999 Caulton1981} Caulton1981 Cederbaum1986 Cederbaum1987! Cejka1997Chadwick2000 Chang2000w Chatakondu1991 Chatterjee20000 Chattopadhyay20003 Chen19931 Chen1995 Chen1996 Chen1996 Chen19969 Chen1996 Chen1997 Chen1997 Chen1997 Chen1998 Chen2000 Chen2000 Chen20000 Chen20000 Chen2001c Cheng1998 Cheng2000 Cheng2000fChernega1993gChernega1993`Chernega1994cChernega19944YChernega19955[Chernega19955^Chernega19955NChernega1996BChernega19974Chernega1998Q Chi1988R Chi1988 Chi2000x Chiang1982 Chiang19871 Chiang19871 Chiang19888  Chiang1988 Chiang19881 Chiang19881 Chiang19899 Chiang19891 Chien1993 Chien2000t Chiesi-Villa1998u Chiesi-Villa1998w Chiesi-Villa19989k Chiesi-Villa1999l Chiesi-Villa1999o Chiesi-Villa1999c Chiesi-Villa2000 Chiesivilla1983 Ching2000J Chirik1999Choueiry19933Choueiry1993Choueiry1995Choueiry1996eiry1996Choueiry1996.563-565 82Negishi, E. Vanhorn, D. E. Yoshida, T. Rand, C. L.RLControlled Carbometalation .15. Zirconium-Promoted Carbozincation of AlkynesOrganometallicsCOrganometallics 19832c4ORGANOMETALLICS6ISI:A1983QL41800021 2568-2569r:3Negishi, E. Holmes, S. J. Tour, J. M. Miller, J. A.PIMetal Promoted Cyclization .7. Zirconium-Promoted Bicyclization of Enynes-.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1985 1078J AMER CHEM SOCRISI:A1985AFM95000718 2829-2832C0*Negishi, E. Cederbaum, F. E. Takahashi, T. Metal-Promoted Cyclization .11. Reaction of Zirconocene Dichloride with Alkyllithiums or Alkyl Grignard-Reagents as a Convenient Method for Generating a Zirconocene Equivalant and Its Use in Zirconium-Promoted Cyclization of Alkenes, Alkynes, Dienes, Enynes, and DiynesTetrahedron LettersTetrahedron Lett. 19862725TETRAHEDRON LETTISI:A1986C867500011H60-ORGN.*#Negishi, E. Choueiry, D. Nguyen, T.t`YStereochemical Aspects of the Zirconium-Promoted Bicyclization Via Alkene-Alkene Coupling:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1993 205o& MAR 28 2 ABSTR PAP AMER CHEM SOCISI:A1993KQ98300196t124-130N Negishi, E. Takahashi, T.OxqPatterns of Stoichiometric and Catalytic Reactions of Organozirconium and Related Complexes of Synthetic Interest$Accounts of Chemical ResearchrMETAL-PROMOTED CYCLIZATION; CARBON BOND FORMATION; ZIRCONOCENE- ALKENE COMPLEXES; X-RAY STRUCTURE; CONTROLLED CARBOMETALATION; ALKYL-ALKENE; THIOALDEHYDE COMPLEXES; MOLECULAR-STRUCTURE; ZIRCONIUM REAGENTS; ETHER DERIVATIVESoAccounts Chem. Res.p 1994275lMAY ACCOUNT CHEM RESISI:A1994NM04300002a 4447-4462n*$Negishi, E. Maye, J. P. Choueiry, D.Stoichiometric Reactions of Nonconjugated Dienes with Zirconocene Derivatives - Further Delineation of the Scope of Bicyclization and Observation of Novel Multipositional Alkene Regioisomerization TetrahedronMETAL-PROMOTED CYCLIZATION; GRIGNARD-REAGENTS; CONVENIENT METHOD; COMPLEXES; ZIRCONIUM; ALKYNES; ENYNES; DIYNES; DIALKYLZIRCONOCENES; REARRANGEMENTThe reaction of n-Bu(2)ZrCp(2) with nonconjugated dienes containing substituted vinyl groups can lead to either bicyclization or the formation of conjugated diene-zirconocenes via multipositional regioisomerization.L TetrahedronG 19955115APR 10 TETRAHEDRONISI:A1995QU56000017u 9577-9588F@Negishi, E. Kondakov, D. Y. Choueiry, D. Kasai, K. Takahashi, T.Multiple mechanistic pathways for zirconium-catalyzed carboalumination of alkynes. Requirements for cyclic carbometalation processes involving C-H activation .(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1996 118R40OCT 9 J AMER CHEM SOC1ISI:A1996VL58600015 417-& "Negishi, E. Kondakov, D. Y.o}An odyssey from stoichiometric carbotitanation of alkynes to zirconium-catalysed enantioselective carboalumination of alkenesChemical Society ReviewsMETAL-PROMOTED CYCLIZATION; CARBON BOND FORMATION; CONTROLLED CARBOMETALATION; CONVENIENT PROCEDURE; ORGANOZIRCONIUM COMPOUNDS; ZIRCONOCENE DERIVATIVES; MONOSUBSTITUTED ALKENES; HYDROGEN ABSTRACTION; GRIGNARD-REAGENTS; COMPLEXESIt has recently been found that alkylalane-zirconocene reagent systems can react with alkynes and alkenes via at least three different paths, i.e., (i) straightforward carbometallation without involving C-H activation, (ii) cyclic carbometallation via beta C-H activation, and (iii) hydrometallation. Various factors affecting the courses of such reactions have been delineated. In some cases, it is even possible to steer these reactions in the desired direction. Our recent development of a Zr-catalysed enantioselective alkene carboalumination reaction is an outgrowth of the above-mentioned systematic, exploratory, and mechanistic investigation.Chem. Soc. Rev. 1996256DEC CHEM SOC REVISI:A1996WL19000006 1922-1923 2+Negishi, E. Ma, S. M. Sugihara, T. Noda, Y.tSynthesis of hydrazulenes via Zr-promoted bicyclization of enynes and transition metal-catalyzed or radical cyclization of alkenyl iodides. Efficient synthesis of (+/-)-7-epi-beta- bulnesene"Journal of Organic Chemistry J. Org. Chem.o 1997627 APR 4 J ORG CHEMISI:A1997WT010000070 <,Vnj  8n6r 1844-1849m2+Wengrovius, J. H. Schrock, R. R. Day, C. S. jcPreparation and Reactions of [Zrcl3(Pr3)2]2 (R = Et, Pr, Bu) and X-Ray Structure of [Zrcl3(Pbu3)2]2Inorganic Chemistryi Inorg. Chem. 1981206 INORG CHEMISI:A1981LS20400046 2376-2378"Wessel, J. Lork, E. Mews, R.:4Alkali Metallocene Anions - Syntheses and Structures82Angewandte Chemie-International Edition in EnglishVOALKALI METAL COMPOUNDS; METALLOCENE ANIONS; SANDWICH COMPLEXES SODIUM; COMPOUND.$Angew. Chem.-Int. Edit. Engl. 19953421NOV 17 ANGEW CHEM INT EDISI:A1995TF904000092443-446..(Wessel, J. Behrens, U. Lork, E. Mews, R.Tris(Dimethylamino)Sulfoniumcyclopentadienide [Tas](+)[C5h5](-) and Tris(Dimethylamino)Sulfoniumpyrrolide [Tas](+)[C4h4n](-) - 2 Isostructural Salts with Naked Anions a(-) and the Inverse Sandwich-Cations [((Me(2)N)(3)S)(2)a](+) (a=C5h5-, C4h4n-)82Angewandte Chemie-International Edition in EnglishAZOLIDES; CYCLOPENTADIENYL COMPOUNDS; SANDWICH COMPLEXES; SULFONIUM SALTS RAY CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; COMPLEXES6$Angew. Chem.-Int. Edit. Engl. 1995344MAR 7 ANGEW CHEM INT EDISI:A1995QM40400007@9Wielstra, Y. Gambarotta, S. Roedelof, J. B. Chiang, M. Y.h 1988:3Mono(Cyclopentadienyl)Zirconium(Ii) and Mono(Cyclopentadienyl)Hafnium(Ii) Chemistry - Synthesis and Reactivity of Cpm(Co)2(Dmpe)Cl [M=Zr, Hf - Cp = Cyclopentadienyl-Dmpe= 1,2-Bis(Dimethylphosphino)Ethane] Via Mild-Condition Carbonylation Reaction of Cpm(Dmpe)2cl - the Crystal-Structure of Cpzr(Co)2(Dmpe)ClSOrganometallics710 2177-2182OrganometallicsTISI:A1988Q542100015 OCT ORGANOMETALLICS GIRFES 1866-1867P0)Wielstra, Y. Gambarotta, S. Chiang, M. Y.[1,2-Bis(Dimethylphosphino)Ethane](Cyclo- Pentadienyl)Methylzirconium(Ii) [Cpzrme(Dmpe)2] - a Catalyst Precursor for the Selective Dimerization of Ethylene to 1- ButeneOrganometallics6Organometallicsu 19887C8AUG ORGANOMETALLICS6ISI:A1988P775000027OJDWielstra, Y. Gambarotta, S. Meetsma, A. de Boer, J. L. Chiang, M. Y. 1989VP(eta$5!-Cyclopentadienyl)-chloro-(1,3-dimethylbuta-1,3-dien-1,4-diyl)-(1,2-bis(dOrganometallics+8, 2696 JAYLOK JAYLEA 2948-2952V:3Wielstra, Y. Gambarotta, S. Meetsma, A. Spek, A. L.lThe Controversy over the Thermal-Stability of Bis(Cyclopentadienyl)Zirconium(Iii) Halides - Synthesis of Cp2zrcl, C5h4me2zrbr, Cp'2zri Via Photolysis of Cp'2zr(I-Bu)X - the X-Ray Structures of [(C5h4me)2zr(Mu-I)]2 and [Eta-5-Eta-5- C10h8][Cpzr(Mu-I)]2OrganometallicsOrganometallics 1989812DEC ORGANOMETALLICSISI:A1989CD70300032 2696-2702A<5Wielstra, Y. Gambarotta, S. Meetsma, A. Deboer, J. L.tCarbon Carbon Bond Formation Versus Hydrogen Transfer in the Reaction of Alkynes with Mono(Cyclopentadienyl)Zirconium(Ii) Complexes - Regioselective Dimerization, Cocyclotrimerization, and Catalytic Cyclotrimerization - the Preparation and X-Ray Structures of Cp(Dmpe)Xzr[(R)C=C(R')C(R)=C(R')] [R = Ch3, R' = H, Ch3, X = Cl, Ch3, Dmpe = 1,2-Bis(Dimethylphosphino)Ethane] and of Cpzr(Dmpe)Cl[C=C(T-Bu)][Ch=Ch(T-Bu)]AOrganometallicsOrganometallics 1989811NOV ORGANOMETALLICSISI:A1989AZ81800028 1-6Y0)Wielstra, Y. Gambarotta, S. Chiang, M. Y.u The Elusive Zirconium(Iii)b\Recueil Des Travaux Chimiques Des Pays-Bas-Journal of the Royal Netherlands Chemical Society:3Recl. Trav. Chim. Pays-Bas-J. Roy. Neth. Chem. Soc.b 1989 108C1)(!JAN REC TRAV CHIM-J ROY NETH CHEM,ISI:A1989T124600001B250-251<5Wielstra, Y. Gambarotta, S. Meetsma, A. Deboer, J. L.f_Preparation and X-Ray Structure of [Cp2zr(Mu-I)]2 - a Thermally Unstable Zirconium(Iii) ComplexOrganometallicslOrganometallicss 1989819JAN ORGANOMETALLICSISI:A1989R739000034-258-259.'Wielstra, Y. Meetsma, A. Gambarotta, S.CSynthesis of New Monomeric Zirconium and Hafnium Hydride Butadiene Complexes - the X-Ray Structure of (Eta-5- Cyclopentadienyl) (Eta-4-Butadiene)-[1,2- Bis(Dimethylphosphino)Ethane]HydridozirconiumOrganometallicsOrganometallics 198981JAN ORGANOMETALLICSISI:A1989R739000038557-INOR"Wielstra, Y. Gambarotta, S.Z\VBinuclear Fulvalene Zr(Iii) and Zr(Iv) Complexes - Synthesis, Structure and Reactivity:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1990 199:& APR 22 1 ABSTR PAP AMER CHEM SOCISI:A1990CZ78302641876-87960Wielstra, Y. Meetsma, A. Gambarotta, S. Khan, S.Cyclopentadiene Functionalization Versus Fulvalene Formation in the Oxidation of [(Eta-1-Eta-5-C5h4)Zrcp(Pme3)]2 - Preparation and Crystal-Structures of [(Eta-1-Eta-5-C5h4)Zrcp]2[Mu-Nsime3] and [(Eta-1-Eta-5-C5h4)][Mu-Nsime3][Cpzrsph][Cp(C5h4sph)Zr]OrganometallicsOrganometallics 199093MAR ORGANOMETALLICSISI:A1990CU73500060cFloriani20000 Fochi1984w Formstone1991u Forte2001 Fortunato2001 Fottinger1998 Foulkes2000* Fowles1967+ Fowles1968N Fragala1989 Fragala1996n Fragala1999 Fragala2000X Frankland1994Q Frankland1996Z Frede1985* Freeman1996h Frenzel1997QFrerichs1988RFrerichs19888Frerichs1993 Friedrich1995> Friedrich19969Frohlich1997rEFrohlich1997eiFrohlich1997[Frohlich2000eFrohlich2000Frohlich2000Frohlich2000Frohlich20000Frohlich2000Frohlich2000Frohlich2000Frohlich2000Frohlich2000Frohlich20011Frohlich2001Fronczek20000Fronczek20000d Fryzuk1986b Fryzuk1989a Fryzuk1990` Fryzuk19922 Fryzuk1993_ Fryzuk1993 Fryzuk1995\\ Fryzuk1996] Fryzuk1996 Fryzuk1997[ Fryzuk1997Y Fryzuk1998Z Fryzuk1998 Fryzuk1999V Fryzuk1999W Fryzuk19999X Fryzuk1999. Fryzuk2000y Fryzuk2001S Fryzuk2001 Fuertes2000 Fujita20000 Fukui1999 Furin2000 Fusco2000 Gabe19911 Gade1995(Galakhov1995hGalakhov1997Galakhov2000Galakhov2000Galakhov20000 Galas1985 Galimberti2000T Galimberti2000Tu Galland2001~ Galland20019Gallucci1994Gallucci199883Gallucci1998Gallucci2000Gallucci2000: Galsworthy1998 Gambarotta1983  Gambarotta1987 Gambarotta1987N  Gambarotta1988  Gambarotta1988  Gambarotta1988 Gambarotta1988 Gambarotta1989 Gambarotta1989 Gambarotta1989 Gambarotta1989 Gambarotta1989 Gambarotta1989 Gambarotta1990 Gambarotta1990 Gambarotta1990 Gambarotta1990 Gambarotta1991 Gambarotta1997 Gambarotta1997 Ganin1986Y Gao2000 Garcia20000sGardiner1991= Gautheron19789 Gautheron19947 Gautheron1995 Gautheron19983 Gautheron1998>Gebhardt199663Gebhardt2000 Gell1981 Gell1981U Gelmini1987S Gelmini1988 Gentil2000 Gerasimova1989 Gervais1984L Gervais1989Giannini1997wGiannini1998akGiannini1999 Gibson19999Y Giesbrecht1998 Gillespie2000m Gillis1996Giordano20000Girolami1984Girolami1985pGlassman1991. Gleiter19953 Gleiter1998 Gobley19983 Gobley19989 Goddard1983 Goddard1993 Goddard1993 Goddard2000> Gomes1997@ Gomes19973 Gomes1998B Gomez1991; Gomez1992f Gomez1993_ Gomez1994[ Gomez1995^ Gomez1995O Gomez1996 Gomez1996g Gomez1997d Gomez1998\ Gomez1999q Gomez2001 Gomez2001g Gomez-Sal1997d Gomez-Sal1998W Gomez-Sal2000q Gomez-Sal2001;Gomezsal1992GomezSal1996GomezSal1996hGomezSal1997GomezSal19977$Gonzalez1999r^Gonzalez1999 Goodman1999 Gorls1993 Gorls1993 Gorls1994 Gorls1995> Gorls1996@ Gorls1996 Gorls1996= Gorls19974 Gorls1999974 Gorls1999974 Gorls199999974 Gorls1999s19974 Gorls1999974 Gorls1999s19974 Gorls1999974 Gorls1999s19974 Gorls1999974 Gorls1999s19974 Gorls1999974 Gorls19994 Gorls19994 Gorls19994 Gorls19994 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls1999974 Gorls1999974 Gorls1999974 Gorls1999974 Gorls1999974 Gorls1999974 Gorls1999974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls1999s19974 Gorls1999s19974 Gorls1999s19974 Gorls1999s19974 Gorls1999s19974 Gorls1999s19974 Gorls1999s19974 Gorls1999s19974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls199919974 Gorls1999 Z.<T Kremer, T. Kresse, G. Kropp, K. Kruger, C.Krut'ko, D. P. Krut'ko, D.P.Kryukova, G. N. Kubista, J. Kuhl, O. Kukral, J.Kulikov, A. V.Kulikova, N. N. Kunz, D. Kupec, J. T. Kupfer, V.Kurihara, L. K. Kuroda, S.Kuz'mina, L. G.Kuzmina, L. G.L.M.Engelhardt<9L.M.Engelhardt, R. I. Papasergio C. L. Raston A. H. White Labed, V.Lachicotte, R. J. Lam, K. C. Lam, M. Lamouroux, C. Lan, J. W.Lancaster, S. J.Lanfranchi, M. Lange, H.Lange, K. C. H. Lange, M. A. Lanza, G.Lappert, M. F.Lara-Sanchez, A. Larsen, E.M.Larsonneur, A. M. Laschi, F. Lasser, W. Latronico, M. Lattanzi, A. Lauher, J. W.Lavalley, J. C.Lawless, G. A. Lee, D. H. Lee, G. H. Lee, H. K. Lee, I. M. Lee, R. A. Lee, S. Lee, Y. S. Lefeber, C. Lefebvre, F. Leffers, W. Lehmus, P. Leino, R.Lemenovskii, D. A. Leonov, A. V. Letov, A. V. Leung, W. P.Lewkebandara, T. S. Li, Y. Z.LiableSands, L. M. Liang, L. C. Licht, E. H.Lickiss, P. D. Linares, J. Lindner, B.Linnolahti, M. Liopis, H. S. Liou, S. Y. Little, I. Liu, A. H. Liu, D. S. Liu, F. Q.Liu, Feng-Quan Liu, J. K.Livinghouse, T. Llinas, G. H. Lock, G. A. Loehr, T. M. Lofgren, B. Longo, P.Lopez-Solera, I. Lorber, C. Lorberth, J. Lork, E. Louey, J. P.Loukova, G. V. Love, J. B. Lu, J. Lubben, T. Lubini, P. Lund, E. C.Luttikhedde, H. J. G. Lutz, M.Lysenko, K. A.Lyssenko, K. A.41M.D.Fryzuk, S. S. H. Mao P. B. Duval S. J. Rettig Ma, S. M.Macgillivray, L. R. Mach, K. Macias, D. M. Macias, D.M. Mae, Y. Magaud, L.Majoral, J. P. Mak, T. C. W.Makarov, A. V.Makhaev, V. D. Mala, A. Malinge, J. Mallien, M. Malmberg, A. Maltese, C.Manriquez, J. M. Mansel, S. Manzanero, A.Manzoni, M. R. Mao, S. S. H. Mao, Sssh Marchetti, F. Marchi, C. Marin, V. P. Marks, T. J. Marsh, R. E. Martin, A. Martinez, B.Martinez-Salazar, J.Martins, A. M. Maruoka, K. Marziano, I.Mascellani, N. Mason, S. A. Massa, W.Matsubayashi, G. E. Matsui, S. Matsukawa, N. Matsukawa, T. Mattheis, C. Mauler, R. S. Maxted, N. Maye, J. P. Mayer, B. Mazo, G. N. McCamley, A.McConville, D. H.McCormack, P. J.McGowan, P. C.McKenzie, T.C.McKeown, A. E. McNeill, K.McNeill, K. P. McPartlin, M.McQuillan, G. P.Medvedev, V. A. Meetsma, A.Mehrkhodavandi, P. Meikap, A. K. Melendez, E.Melikhov, I. V. Mena, M. Menjon, B.Mercandelli, P. Metzler, N. Meunier, P. Mewis, A. Mews, R. Meyer, O.Michaelidou, D. M. Michalik, M. Mihalios, D. Milius, W. Miller, J. A. Miller, S. R.Millward, D. B.Milovancev, M. M.Minacheva, M. K.Miola-Delaite, C. Mitani, M. Mitra, M. K. Mizuno, Y.Montchamp, J. L. Montejano, C. Moore, M. W.Morawietz, M. J. A. Mori, M.Moriaty, K. J. Morise, X. Morokuma, K.Morozova, O. S. Morton, C. Moulin, C. Mountford, P. Mu, Y. Mukherjee, P. Muller, B. Muller, B. G. Muller, C. Muller, G. Muller, M. Muller, U. Mulvey, R. E.Munoz-Escalona, A. Murai, T. Murata, M.Murillo, C. A. Murphy, E. F. Murphy, E. M. Murphy, E.F. Murphy, V. Musaev, D. G.Mylvaganam, M.,&N.J.Wells, J. C. Huffman K. G. Caulton Naga, N. Nakajima, K. Nakamura, A. Nakano, M. Nakano, T. Nakatsuka, O. Nakayama, Y. Namiki, K. C. Nasman, J. H. Neander, S.Nedorezova, P. M. Negishi, E.Neugebauer, U.DbM&dp* 4795-4812pNGAizenberg, M. Turculet, L. Davis, W. M. Schattenmann, F. Schrock, R. R.rSynthesis of group 4 complexes that contain the tridentate diamido/donor ligands [(ArylNCH(2)CH(2))(2)O](2-) and zirconium complexes that contain [(ArylNCH(2)CH(2))(2)S](2-) and an evaluation of their activity for the polymerization of 1-hexeneOrganometallicsOrganometallics 19981722OCT 26 ORGANOMETALLICSISI:000076855900007JCAl-Juaid, S. Gun'ko, Y. K. Hitchcock, P. B. Lappert, M. F. Tian, S.\ 1999PJOrganolanthanide chemistry with bis(trimethylsilyl)methyl- and tert-butyldimethylsilyl-substituted cyclopentadienyl ligands. Synthesis and characterisation of tris(cyclopentadienyl)lanthanide(III) complexes, including crystal structures of [Ln{eta(5)-C5H4CH(SiMe3)(2)}(3)] (Ln = Nd or Tm) and [Ce{eta(5)-C5H3(SiMe2But)(2)-1,3}(3)]*#Journal of Organometallic Chemistry 5822143-152J. Organomet. Chem.ISI:000081108500001-cerium; cyclopenadienyls; lanthanides; neodymium; thulium; X- rays CHEMICAL VAPOR-DEPOSITION; C-O BOND; SODIUM HYDRIDE; METAL- COMPLEXES; ORGANOMETALLIC COMPOUNDS; COORDINATION CONDITIONS; MOLECULAR-STRUCTURE; GENERAL-SYNTHESIS; ALKALI-METAL; DOPED INP*$The homoleptic tris(substituted cyclopentadienyl)lanthanide(III) complexes [LnCp(3)(R)] (Ln = La (1), Ce (2), Pr (3), Nd (4), Sm (5), Gd (6), Tb (7), Dy (8), Er (9), Tm (10) and Yb (11)], [NdCp3t] (12), [CeCp3tt] (13) and [NdCp3tt] (14) [Cp-R = eta(5)-C5H4{CH(SiMe3)(2), Cp-t = eta(5)- C5H4(SiMe2But), Cp-tt = eta(5)-C5H3(SiMe2But)(2)-1,3], have been synthesised by the reaction of the anhydrous lanthanide(III) halide with the appropriate sodium or potassium cyclopentadienide in THF. The characterisation of these complexes was established by H-1-, C-13- and Si-29-NMR spectroscopy (for 1-5 and 12-14), elemental analysis and mass spectrometry. The early paramagnetic lanthanide complexes 2-5, and 12-14 had very sharp H-1-NMR spectral signals, and the paramagnetic shifts were temperature-dependent. The molecular structures of 4, 10 and 13 have been determined by single crystal X-ray diffraction studies. The attempted syntheses of organoneodymium(II) and organothulium(II) complexes are also described. (C) 1999 Elsevier Science S.A. All rights reserved. JUN 20 J ORGANOMETAL CHEMp 45-54IhaAlcock, N. W. Clase, H. J. Duncalf, D. J. Hart, S. L. McCamley, A. McCormack, P. J. Taylor, P. C.eJDSynthesis of racemic chiral-at-metal complexes of the Group 4 metals*#Journal of Organometallic ChemistryRKtitanocene; zirconocene; hafnocene ZIRCONIUM; REACTIVITY; TITANIUM; CRYSTAL>7A protocol for asymmetric synthesis of chiral-at-metal complexes is described, but enantiomerically-enriched products can not be isolated due to formation of complexes between the Group 4 metallocene products and the borane by-products. An efficient method for synthesis of racemic chiral-at-metal metallocenes, through lithium chloride catalysed ligand redistribution reactions, is described. Sterically-hindered racemic chiral-at-metal complexes are prepared by nucleophilic substitution of prochiral dichlorides. (C) 2000 Elsevier Science S.A. All rights reserved.J. Organomet. Chem. 2000 6051JUN 30 J ORGANOMET CHEMISI:000088798400007Alt, H., Rausch, M. D. 1974^WPhotochemical reaction of dimethyl derivatives of titanocene, zirconocene and hafnocenet*$Journal of American Chemical Society9618 5936-5937C83-C85A82Alt, H. G. Denner, C. E. Thewalt, U. Rausch, M. D.F?Cp2zr(C2h4)(Pme3), the 1st Stable Ethylene Complex of Zirconium*#Journal of Organometallic ChemistrySJ. Organomet. Chem. 1988 3563DEC 6 J ORGANOMETAL CHEMISI:A1988R429000014s 89-95H(!Alt, H. G. Han, J. S. Thewalt, U.Zirconocene Complexes with a Functionalized Cyclopentadenyl Ligands - Molecular-Structure of (Eta-5-C5h5)(Eta-5-Eta-2- C5h4cme2c9h7)Zr(Pme3)*#Journal of Organometallic ChemistryNJ. Organomet. Chem.9 1993 456g1  AUG 24 J ORGANOMETAL CHEMISI:A1993LW11400016 onium*#Journal of Organometallic ChemistrySJ. Organomet. Chem. 1988 3563DEC 6 J ORGANOMETAL CHEMISI:A1988R429000014s 89-95H(!Alt, H. G. Han, J. S. Thewalt, U.Zirconocene Complexes with a Functionalized Cyclopentadenyl Ligands - Molecular-Structure of (Eta-5-C5h5)(Eta-5-Eta-2- C5h4cme2c9h7)Zr(Pme3)*#Journal of Organometallic ChemistryNJ. Organomet. Chem.9 1993 456g1  AUG 24 J ORGANOMETAL CHEMISI:A1993LW11400016 m^jtxX}ZN R("Od^|[h_lB3H>^p& 2347-2350IF@Girolami, G. S. Wilkinson, G. Thorntonpett, M. Hursthouse, M. B.Eta-5-Cyclopentadienyl and Eta-5-Methylcyclopentadienyl 1,2- Bis(Dimethylphosphino)Ethane Complexes of Titanium(Ii) - the Crystal-Structure of Ti(C5h4me)2(Dmpe):3Journal of the Chemical Society-Dalton Transactionsr"J. Chem. Soc.-Dalton Trans.e 198410J CHEM SOC DALTON TRANSaISI:A1984TP09900044i 1339-1348UVPGirolami, G. S. Wilkinson, G. Galas, A. M. R. Thorntonpett, M. Hursthouse, M. B.Synthesis and Properties of the Divalent 1,2- Bis(Dimethylphosphino)Ethane (Dmpe) Complexes Mcl2(Dmpe)2 and Mme2(Dmpe)2 (M=Ti, V, Cr, Mn, or Fe) - X-Ray Crystal-Structures of Mcl2(Dmpe)2 (M=Ti, V, or Cr), Mnbr2(Dmpe)2, Time1.3cl0.7(Dmpe)2, and Crme2(Dmpe):3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19857J CHEM SOC DALTON TRANSISI:A1985ALZ8800010 4723-4732t0)Glassman, T. E. Liu, A. H. Schrock, R. R.oleBimetallic Hydrazido(3-And4-) and Nitrido Complexes of Tungsten Containing the W(Eta-5-C5me5)Me3 CoreInorganic Chemistry  Inorg. Chem. 19913025DEC 11 INORG CHEMcISI:A1991GT93800010- 4897-4903upjGobley, O. Meunier, P. Gautheron, B. Gallucci, J. C. Erker, G. Dahlmann, M. Schloss, J. D. Paquette, L. A.Some new exo,exo-bis(isodicyclopentadienyl)titanium and - zirconium dichloride derivatives: Synthesis, characterization, and evaluation as propene polymerization catalystsOrganometallics3Organometallics 19981722OCT 26 ORGANOMETALLICSISI:0000768559000197121-125 @9Gomes, P. T. Green, M. L. H. Martins, A. M. Mountford, P.rlAnsa-bridged eta-cyclopentadienyl imido and amido derivatives of titanium, zirconium, niobium and molybdenum*#Journal of Organometallic ChemistryrJ. Organomet. Chem.9 1997 541T 1-2N AUG 15 J ORGANOMETAL CHEM:ISI:A1997YA93500014c133-138K2+Gomes, P. T. Green, M. L. H. Martins, A. M.jcAnsa-bridged eta-cyclopentadienyl imido and amido derivatives of titanium, zirconium and molybdenum*#Journal of Organometallic ChemistryoJ. Organomet. Chem.h 1998 551m 1-29 JAN 30 J ORGANOMETAL CHEM-ISI:000073410100016T 1505-1510OHAGomez, R. Cuenca, T. Royo, P. Pellinghelli, M. A. Tiripicchio, A.VGroup-4 Ansa-Metallocenes in Oxidation State-Iii - Synthesis, Characterization, and Chemical Behavior - Crystal-Structure of ([Eta-5-Eta-5-(C5h4)2si(Ch3)2]Ticl(Pme2ph))OrganometallicsTOrganometallicsT 1991105 MAY ORGANOMETALLICSCISI:A1991FM14600049I 2607-2608.(Gomez, R. Green, M. L. H. Haggitt, J. L.|vUnexpected Reactions of Pentafluorophenylboron Compounds with Eta-Cyclopentadienyl(Benzamidinato)Zirconium Derivatives>7Journal of the Chemical Society-Chemical Communicationst"J. Chem. Soc.-Chem. Commun.c 199422$NOV 21 J CHEM SOC CHEM COMMUN ISI:A1994PU25900035:153-158V\UGomez, R. Duchateau, R. Chernega, A. N. Teuben, J. H. Edelmann, F. T. Green, M. L. H.b[Mono-Eta-Cyclopentadienyl-Benzamidinato Chloro Compounds of Titanium, Zirconium and HafniumM*#Journal of Organometallic ChemistryTJ. Organomet. Chem.A 1995 491L 1-2:APR 5 J ORGANOMETAL CHEMISI:A1995QN89000019C217-225NhaGomez, R. Duchateau, R. Chernega, A. N. Meetsma, A. Edelmann, F. T. Teuben, J. H. Green, M. L. H.XQMono(Eta-Cyclopentadienyl)Benzamidinato Alkyl-Compounds of Titanium and Zirconiumu:3Journal of the Chemical Society-Dalton Transactionsf"J. Chem. Soc.-Dalton Trans.. 19952$JAN 21 J CHEM SOC DALTON TRANSISI:A1995QD21200009939-946H.(Gomez, R. Green, M. L. H. Haggitt, J. L.ztUnexpected reactions of pentafluorophenyl boron compounds with eta-cyclopentadienyl(benzamidinato)zircon derivatives:3Journal of the Chemical Society-Dalton Transactionsa"J. Chem. Soc.-Dalton Trans. 19966E$MAR 21 J CHEM SOC DALTON TRANSISI:A1996UC26200018T 5820-5824.'Graf, D. D. Davis, W. M. Schrock, R. R.mf`Synthesis of yttrium complexes that contain the [NON](2-) ligand, [(t-Bu-d(6)-N-o-C6H4)(2)O](2-)Organometallics-Organometallics) 19981726DEC 21 ORGANOMETALLICSISI:000077727800029A843-852 82Graf, D. D. Schrock, R. R. Davis, W. M. Stumpf, R.Synthesis of zirconium complexes containing the tridentate diamido ligands [(t-Bu-d(6)-N-o-C6H4)(2)S](2-) and [(i-PrN-o- C6H4)(2)S](2-)pOrganometallicscOrganometallicsu 1999185rMAR 1 ORGANOMETALLICSiISI:000079022200008 1865-1867[$Green, M. L. H. Walker, N. M.HDivalent Diene and Triene Compounds of Zirconium and Hafnium - X-Ray Crystal-Structures of [Hf(Eta-4-Ch2=Cme- Cme=Ch2)(Pme3)2cl2], [Zr(Eta-5-C5h5)2(Pme3)(Eta-2-C7h8)], and ([Hf(Eta-7-C7h7)(Eta-5-C9h7)]2(Mu-Me2pch2ch2pme2))>7Journal of the Chemical Society-Chemical Communicationsl"J. Chem. Soc.-Chem. Commun.9 198924$DEC 15 J CHEM SOC CHEM COMMUN:ISI:A1989CK59600001 908-909 2+Green, M. L. H. Mountford, P. Walker, N. M.\VHalf-Sandwich Compounds of Zirconium(Ii) - the Synthesis of [Zr(Eta-6-C7h8)(Pme3)2cl2]>7Journal of the Chemical Society-Chemical Communications."J. Chem. Soc.-Chem. Commun. 198914$JUL 15 J CHEM SOC CHEM COMMUNAISI:A1989AH713000139 5-CATL<6Green, M. L. H. Ishihara, N. Song, X. J. Walker, N. W.b[Homogeneous Polymerization of Propene by Organometallic Complexes of Titanium and Zirconium:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1990 199& APR 22 2 ABSTR PAP AMER CHEM SOCISI:A1990CZ78501696E173-180 0*Green, J. C. Green, M. L. H. Walker, N. M.nhSynthesis, Crystal-Structure and Reactions of Zerovalent 16- Electron Bis(Eta-Cycloheptatriene)Zirconium:3Journal of the Chemical Society-Dalton Transactionsa"J. Chem. Soc.-Dalton Trans.M 19912"FEB J CHEM SOC DALTON TRANSAISI:A1991EX664000038 3077-3082BPJGreen, M. L. H. Hughes, A. K. Popham, N. A. Stephens, A. H. H. Wong, L. L.f_Nuclear-Magnetic-Resonance Studies on Partially Deuteriated Transition-Metal Methyl-Derivativesm:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.E 199221$NOV 7 J CHEM SOC DALTON TRANS1ISI:A1992JY10600003E 1591-1600ZSGreen, M. L. H. Hughes, A. K. McGowan, P. C. Mountford, P. Scott, P. Simpson, S. J.,F?Cycloheptatri-Ene and Cycloheptatri-Enyl Derivatives of Niobium:3Journal of the Chemical Society-Dalton Transactionsa"J. Chem. Soc.-Dalton Trans.t 199210$MAY 21 J CHEM SOC DALTON TRANSISI:A1992HW16600001J209-211 Green, M. L. H. Morise, X.LFDivalent Eta-Arene(Bis-Eta-Allyl) Derivatives of Zirconium and Hafnium*#Journal of Organometallic Chemistry)J. Organomet. Chem. 1993 462= 1-22 DEC 14 J ORGANOMETAL CHEMoISI:A1993MM53500027h .7ZT Guery, D. Guidi, G. Guidotti, S. Gulino, A. Gun'ko, Y. K. Guzei, I. A. Gyepes, R. H.V.Rasika Dias, Ziyun Wang("H.W.Roesky, E. M. Murphy T. Albers Hackert, H. Haddad, T. S. Hafner, J. Hagenau, U. Haggitt, J.Haggitt, J. L. Hagihara, H. Hakala, K.Halterman, R. L. Hamaide, T. Hampel, B. Han, J. S. Hanawa, H. Hanus, V. Hanusa, T. P. Hao, H. J. Hara, M. Hara, R. Harada, A. Harder, S.Hardesty, J. H. Harlan, C. J. Harris, T. V. Hart, S. L. Harvey, M. J. Hasegawa, M. Hasegawa, S. Haukka, M.Haussinger, D. Haussuhl, E. Hayakawa, R. Heck, J. Heeg, M. J. Heerdmann, A. Helaja, T. Heller, B. Heller, D.Henderson, K. W. Henein, M. M. Henzler, T.E.Herberhold, M. Herdtweck, E. Hernandez, C.Herrmann, W. A. Herzig, P. Herzog, A. Hessen, B.Hey-Hawkins, E.HeyHawkins, E. Heyn, R. H. Hickey, N. Hidalgo, G. Hielscher, B. Hiller, J. Hiltbrand, E. Hirata, A. Hirata, M. Hirva, P. Hitchcock, P.Hitchcock, P. B.Hjorth-Jensen, M. Ho, J. Ho, J. W.Hoffman, D. M. Hoffman, V. Hoffmann, R. Hofmann, P. Holmes, S. J. Holst, C. Holt, A. Hong, H. Honold, B. Horacek, M. Hoskin, A. J. Hou, Z. M. Housley, N.Hoveyda, A. H.Howard, J. A. K. Howie, R. A. Hu, J. Hu, S. R. Huang, W. J.Huffman, J. C. Hughes, A. K.Huhmann, J. L. Hunter, B. K. Hunter, W. E. Huo, S. Q.Hursthouse, M. B. Huttner, G. Hwang, T. S.Hylakryspin, I.<9I.E.Nifant'ev, P. V. Ivchenko V. V. Bagrov L. G. Kuz'mina Igau, A. Ikeda, T.Ilinskii, A. L. Imanishi, Y. Immirzi, A.Incarvito, C. D. Ing, D.(#Inorganic Chemistry, Communications Inoue, S. Ishida, H. Ishihara, N. Ishitani, H. Isobe, T. Issleib, K.Ivchenko, P. V. Ivleva, I. N. Iyer, S. Izmer, V. V.@7Synthetic and reactivity studies of mono- and dicyclopentadienyl titanium, zirconium and hafnium complexes with the chlorodimethylsilyl-cyclopentadienyl ligand. X-ray molecular structure of Hf{(eta 5-C5H4) SiMe2OSiMe2OSiMe2(eta(5)-C5H4)}Cl-2 and Zr(eta(5)-1,3- (Bu2C5H3)-Bu-t)(eta(5)-C5H4SiMe2-eta-(NBu)-Bu-t)Cl*#Journal of Organometallic ChemistryJ. Organomet. Chem. 2000 6041JUN 5 J ORGANOMET CHEMISI:000088339500014& Cloke, F. G. N., Green, M. L. H. 1979 Chem. Commun.t 127l 1938-1943i&Cloke, F. G. N. Green, M. L. H.,~Synthesis of Zerovalent Bis(Eta-Arene) Compounds of Zirconium, Hafnium, Niobium, Tantalum, and Tungsten Using the Metal Vapors:3Journal of the Chemical Society-Dalton TransactionsP"J. Chem. Soc.-Dalton Trans.9 198190J CHEM SOC DALTON TRANSISI:A1981MH01300025 117-118 F@Cloke, F. G. N. Cox, K. P. Green, M. L. H. Bashkin, J. Prout, K.rkBis(Trimethyltin)Bis-(Eta-Toluene)-Hafnium and Zirconium - X- Ray Crystal-Structure of the Hafnium Compoundg>7Journal of the Chemical Society-Chemical Communications "J. Chem. Soc.-Chem. Commun.e 19813SJ CHEM SOC CHEM COMMUNISI:A1981LB910000370Jnd221-223.\URosenthal, U. Lefeber, C. Arndt, P. Tillack, A. Baumann, W. Kempe, R. Burlakov, V. V.-xqIntramolecular Insertion of an Eta(5)-Cyclopentadienyl Ring in a Bis-Eta(5)-Cyclopentadienyltitanacyclopentadiene*#Journal of Organometallic ChemistrydTITANOCENE; CYCLOPENTADIENYL; X-RAY DIFFRACTION; C-C COUPLING; TRIMETHYLSILYL; METALLACYCLE TITANOCENE DERIVATIVES; ALKYNE COMPLEXES; ZIRCONOCENE; LIGANDSF?The reaction of in situ-generated titanocene ''Cp(2)Ti'' with 2 equiv. of alkynes Me(3)SiC=CR yields a mixture of symmetrically [Cp(2)TiC(SiMe(3))=C(R)C(R)=C(SiM(3))](R=Ph (3), Py (6)) and unsymmetrically [Cp(2)TiC(SiMe(3))=C(R)C(SiMe(3))=C(R)(SiMe(3))=C(R)](R=Ph (4), Py (7)) substituted titanacyclopentadienes. Complex 7 is unstable and rearranges with an intramolecular insertion of one Cp of the titanocene fragment into the unsymmetrically substituted titanacyclopentadiene to produce the dihydroindenyl complex 8, which was characterized by an X-ray structure analysis.J. Organomet. Chem. 1995 5032 NOV 15 J ORGANOMETAL CHEMISI:A1995TC65600007119-129RD=Rosenthal, U. Pellny, P. M. Kirchbauer, F. G. Burlakov, V. V.CD=What do titano- and zirconocenes do with diynes and polyynes?o$Accounts of Chemical ResearchSTRAINED CYCLIC CUMULENES; CARBON BOND FORMATION; C SINGLE BOND; DISUBSTITUTED 1;3-BUTADIYNES; METALLOCENE COMPLEXES; METAL-COMPLEXES; CYCLIZATION; CLEAVAGE; ORGANOZIRCONIUM; ZIRCONIUMA thorough investigation of the reactions of diynes, R(C=C)(2)R, and polyynes, R(C=C),R, with titanocene and zirconocene was performed using the metallocene sources Cp2M(C)(eta(2)-Me3SiC=CSiMe3) (M = Ti, L = -; M = Zr, L = THF, pyridine). The conversions show an array of different products generated in complexation, coupling, and cleavage reactions. These results include remarkable structures (e.g., five- membered metallacyclocumulenes) and reactions (e.g., C-C single-bond cleavage). In addition, the first C-C single-bond metathesis in homogeneous solution was discovered. The presented findings have been supported by theoretical studies.rAccounts Chem. Res.i 2000332tFEB ACCOUNT CHEM RESISI:000085425000007e 3921-3926t*#Rousset, C. J. Iyer, S. Negishi, E.lEnantiomerically pure zirconium and hafnium complexes containing a chiral cyclopentadiene derivative prepared from (- )-beta-pineneiTetrahedron-AsymmetrylzASYMMETRIC HYDROGENATION; ANNULATED CYCLOPENTADIENES; ISODICYCLOPENTADIENES; LIGAND; MOLECULES; CATALYSIS; CHEMISTRY; POOLChirally homogeneous (1S,8R)-3,5,9,9- tetramethyltricyclo[6.1.1.0(2,6)]deca-2,5-diene 1 has been prepared in five steps and 42% overall yield from (-)-beta- pinene; its successive treatment first with n-BuLi and then with ZrCl4 or HfCl4 provides, in high yields with high pi- facial selectivity, the corresponding dichlorobis{eta(5)- (1S,8R)-3,5,9,9-tetramethyltricyclo[6.1.1.0(2,6)]deca-3,5-dien- 2-yl}zirconium or hafnium, respectively. (C) 1997 Elsevier Science Ltd. All rights reserved.Tetrahedron: Asymmetry 1997823"DEC 11 TETRAHEDRON-ASYMMETRYISI:000071049800013 3347-3353 0)Royo, E. Galakhov, M. Royo, P. Cuenca, T.GSynthetic and NMR studies of neutral and cationic dinuclear fulvalene zirconium complexes containing the "Zr-2(mu-(CNBu)- Bu-t)" unitOrganometallicsOrganometallics 20001917AUG 21 ORGANOMETALLICSISI:00008895620001489-INOR Rogers, J. S. Bazan, G. C.`YFulvene-to-cyclopentadienyl conversion with homoleptic complexes of zirconium and hafnium:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 2000 219& MAR 26 1 ABSTR PAP AMER CHEM SOCISI:000087246104454157-163CRohmer, M. M. Benard, M.Superlong Metal Metal Single Bonds in Bimetallic Complexes of Zirconium(Iii) - Extended Huckel and Abinitio Self-Consistent Field Configuration-Interaction StudyOrganometallicsOrganometallics 1991101iJAN ORGANOMETALLICSmISI:A1991ER63000043119-129D=Rosenthal, U. Pellny, P. M. Kirchbauer, F. G. Burlakov, V. V.D=What do titano- and zirconocenes do with diynes and polyynes?o$Accounts of Chemical Research STRAINED CYCLIC CUMULENES; CARBON BOND FORMATION; C SINGLE BOND; DISUBSTITUTED 1;3-BUTADIYNES; METALLOCENE COMPLEXES; METAL-COMPLEXES; CYCLIZATION; CLEAVAGE; ORGANOZIRCONIUM; ZIRCONIUMA thorough investigation of the reactions of diynes, R(C=C)(2)R, and polyynes, R(C=C),R, with titanocene and zirconocene was performed using the metallocene sources Cp2M(C)(eta(2)-Me3SiC=CSiMe3) (M = Ti, L = -; M = Zr, L = THF, pyridine). The conversions show an array of different products generated in complexation, coupling, and cleavage reactions. These results include remarkable structures (e.g., five- membered metallacyclocumulenes) and reactions (e.g., C-C single-bond cleavage). In addition, the first C-C single-bond metathesis in homogeneous solution was discovered. The presented findings have been supported by theoretical studies.Accounts Chem. Res. 2000332FEB ACCOUNT CHEM RESISI:000085425000007 3921-3926t*#Rousset, C. J. Iyer, S. Negishi, E.lEnantiomerically pure zirconium and hafnium complexes containing a chiral cyclopentadiene derivative prepared from (- )-beta-pineneiTetrahedron-AsymmetrylzASYMMETRIC HYDROGENATION; ANNULATED CYCLOPENTADIENES; ISODICYCLOPENTADIENES; LIGAND; MOLECULES; CATALYSIS; CHEMISTRY; POOLChirally homogeneous (1S,8R)-3,5,9,9- tetramethyltricyclo[6.1.1.0(2,6)]deca-2,5-diene 1 has been prepared in five steps and 42% overall yield from (-)-beta- pinene; its successive treatment first with n-BuLi and then with ZrCl4 or HfCl4 provides, in high yields with high pi- facial selectivity, the corresponding dichlorobis{eta(5)- (1S,8R)-3,5,9,9-tetramethyltricyclo[6.1.1.0(2,6)]deca-3,5-dien- 2-yl}zirconium or hafnium, respectively. (C) 1997 Elsevier Science Ltd. All rights reserved.Tetrahedron: Asymmetry 1997823"DEC 11 TETRAHEDRON-ASYMMETRYISI:000071049800013 3347-3353 0)Royo, E. Galakhov, M. Royo, P. Cuenca, T.GSynthetic and NMR studies of neutral and cationic dinuclear fulvalene zirconium complexes containing the "Zr-2(mu-(CNBu)- Bu-t)" unitOrganometallicsOrganometallics 20001917AUG 21 ORGANOMETALLICSISI:00008895620001484:917-920N@9Negishi, E. Swanson, D. R. Cederbaum, F. E. Takahashi, T.ngMetal-Promoted Cyclization .15. Zirconium-Promoted Bicyclization of Enynes - Effects of Enyne StructureTetrahedron Letters7Tetrahedron Lett.  19872898TETRAHEDRON LETTISI:A1987G199500002; 6014-6016 Negishi, E. Miller, S. R. zMetal-Promoted Cyclization .31. Stereoselective Synthesis of Exocyclic Alkenes Via Zirconium-Promoted Alkyl-Diene Coupling"Journal of Organic Chemistry J. Org. Chem. 19895426DEC 22 J ORG CHEM ISI:A1989CF59900008I 2-10 Negishi, E. Takahashi, T. HAOrganic Syntheses Using Zirconium Compounds - Recent Developments2,Journal of Synthetic Organic Chemistry Japan J. Synth. Org. Chem. Jpn.g 1989471JAN J SYN ORG CHEM JPNISI:A1989R944300001C    % - FUKsb. .e Au Q Ke k q  6  &' o   a  ,[ , D    q m   < `T ^7 )V   S | Tb  Z;  nE  8A | -R CG 6  @ l/ BJJ~$YP!J41-INOR.4-McNeill, K. P. Bergman, R. G. Andersen, R. A.XRReduction of nitrogen oxides to dinitrogen by well-defined zirconium(II) complexes:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1997 213E& APR 13 2 ABSTR PAP AMER CHEM SOCISI:A1997WP18700204R 8260-8269r McNeill, K. Bergman, R. G.Rapid reduction of nitric oxide to dinitrogen by zirconium(II): Kinetic studies on a reaction controlled by gas-liquid transport.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.G 1999 121536SEP 15 J AMER CHEM SOCISI:000082768300016S 7841-7842a:4Mehrkhodavandi, P. Bonitatebus, P. J. Schrock, R. R.A comparison of cationic zirconium methyl and isobutyl initiators that contain an arylated diamido-pyridine ligand for polymerization of 1-hexene. Elucidation of a dramatic "initiator effect"A.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 2000 12232AUG 16 J AM CHEM SOCISI:000088946100039 2663-2675DTNMichaelidou, D. M. Green, M. L. H. Hughes, A. K. Mountford, P. Chernega, A. N.The Lanthanide-Hydrogen-Transition Metal-Compounds - [((Pme(3))(3)Wh5)2yb-Center-Dot-L(3)] and [((Eta- C5h5)(2)Nbh2)Yb-2-Center-Dot-L(3)] Where L(3)=(Meoch(2)Ch(2))(2)O, and Related Studies Studies Polyhedron Polyhedron 19951419SEP POLYHEDRONISI:A1995RU14700009 5863-5866A Miller, J. A. Negishi, E.HlfControlled Carbometallation .19. Zirconium-Catalyzed Allylalumination and Benzylalumination of AlkynesTetrahedron LettersTetrahedron Lett. 19842551TETRAHEDRON LETTISI:A1984TW70800009 1870-1878 2+Millward, D. B. Cole, A. P. Waymouth, R. M. d]Catalytic carboalumination of olefins with cyclopentadienylamidotitanium dichloride complexesOrganometallicsOrganometallicsC 20001910MAY 15 ORGANOMETALLICSISI:000087021000013: 3902-3909o0*Millward, D. B. Sammis, G. Waymouth, R. M.Ring-opening reactions of oxabicyclic alkene compounds: enantioselective hydride and ethyl additions catalyzed by group 4 metals"Journal of Organic ChemistryCYCLIC ALLYLIC ETHERS; KINETIC RESOLUTION; MONOSUBSTITUTED ALKENES; ORGANOLITHIUM REAGENTS; ACYCLIC COMPOUNDS; ROUTE; POLYMERIZATION; COPOLYMERS; METALLOCENE; COMPLEXESTitanium and zirconium catalysts selectively catalyze either the ethyl or hydride addition to [2.2.1] 4,5- bis(methoxymethyl)-7-oxabicycloheptene (6); the ring-opened products formed depend on catalyst, temperature, alkylaluminum reagent, and the concentration of alkylaluminum. Bis(neoisomen- thylindenyl)zirconium dichloride catalyzes the ethyl addition ring-opening of 6 to produce (LR, 2S,3S,6R)-2,3- bis(methoxymethyl)-6-ethylcyclohex-4-enol (7) in 96% ee. Zirconium catalysts catalyze the ring-opening of [3.2.1] 2,4- dimethyl-3-(benzyloxy)-8-oxabicyclo-6-octene (7) when ethylmagnesium bromide is used as a reagent. Both hydride and ethyl addition products are obtained at all conditions studied. Bis(neoisomenthylindenyl)zirconium dichloride catalyzes the ethyl addition ring-opening of 7 to produce (1S,2R,3S,4S,7S)- 2,4-dimethyl-3-(benzyloloxy)-7-ethyl-5-cyclohexen-1-ol (8) in 48% ee. J. Org. Chem. 20006513JUN 30 J ORG CHEMISI:000087925800003810-821.F?Strauch, J. Warren, T. H. Erker, G. Frohlich, R. Saarenketo, P.b\Formation and structural properties of salicylaldiminato complexes of zirconium and titaniumInorganica Chimica Acta9Inorg. Chim. ActaG 2000 3008APR 30 INORG CHIM ACTAISI:0000874228000957809-819B8Chen, L. F. Cotton, F. A. Klooster, W. T. Koetzle, T. F.\UCharacterization and reactions of [PPh4](3)[Zr6Cl18H5] and its deprotonation products.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1997 119r50DEC 17 J AMER CHEM SOCISI:000071146000020t 4047-4054Z0)Chen, L. F. Cotton, F. A. Wojtczak, W. A.Synthesis and structural characterization of compounds containing the [Zr6Cl18H5](3-) cluster anion. Determination of the number of cluster hydrogen atomsInorganic Chemistry9 Inorg. Chem. 19973618AUG 27 INORG CHEM0ISI:A1997XT97700035g105-120. Chen, L. F. Cotton, F. A.lHANew hydrogen-containing zirconium clusters with phosphine ligandsInorganica Chimica ActaInorg. Chim. Acta  1997 257l1yAPR 1 INORG CHIM ACTAISI:A1997XB58000013 63-91 Chen, L. F. Cotton, F. A.l:4New hexazirconium clusters containing hydrogen atoms Journal of Cluster ScienceJ. Clust. Sci. 199891MAR J CLUST SCIISI:000078700100004967-974C@:Chen, C. T. Doerrer, L. H. Williams, V. C. Green, M. L. H.xqNiobium- and tantalum-benzamidinato complexes with trimethylphosphine, imido, or eta-cyclopentadienyl derivativest:3Journal of the Chemical Society-Dalton TransactionsN"J. Chem. Soc.-Dalton Trans.0 20006J CHEM SOC DALTON TRANSISI:000085890300021199-INORB7Journal of the Chemical Society-Chemical Communicationsr"J. Chem. Soc.-Chem. Commun. 199318$SEP 21 J CHEM SOC CHEM COMMUN2ISI:A1993LZ76200027a582-INOR\VChi, K. M. Frerichs, S. R. Philson, S. B. Blackburn, D. W. Tinkham, M. L. Ellis, J. E.B;Highly Reduced Carbonyls of Titanium, Zirconium and Hafnium:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1988 195P&JUN 5 1 ABSTR PAP AMER CHEM SOCEISI:A1988P5991031887 2923-2927 <6Chi, Y. Lan, J. W. Ching, W. L. Peng, S. M. Lee, G. H.Syntheses and characterization of mixed acetylacetonate- catecholate complexes of zirconium, [Zr- 3(acac)(4)(cat)(4)(MeOH)(2)], [Zr(acac)(2)(DBcat)](2) (H(2)DBcat=3,5-di-tert-butylcatechol) and [Zr-4(mu(4)- O)(acac)(4)(DBcat)(3)(OMe)(4)(MeOH)]:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 200017J CHEM SOC DALTON TRANSISI:000088987800008 1864-1865M2+Chiang, M. Y. Gambarotta, S. Vanbolhuis, F. Dinuclear and Diamagnetic Zirconium(Iii) Derivatives without Zr-Zr Bond - Synthesis and X-Ray Structure of (Cp2zr[Mu- P(Ch3)2])2 and (Cp2zr)2(Mu-Cl)[Mu-P(Ch3)2]OrganometallicsOrganometallics 198878AUG ORGANOMETALLICSISI:A1988P775000026gP6DLJ0 1873-1881(,&Chirik, P. J. Day, M. W. Bercaw, J. E.Preparation and characterization of monomeric and dimeric group IV metallocene dihydrides having alkyl-substituted cyclopentadienyl ligandsOrganometallicsHYDRIDE DERIVATIVES; OLEFIN POLYMERIZATION; CARBON-MONOXIDE; COMPLEXES; ZIRCONOCENE; REACTIVITY; CATALYSTS; CHEMISTRY; ZIRCONIUM; HAFNIUMTMA series of zirconocene dihydride complexes of the general form [(RnCp)(2)ZrH2](x) having substituted cyclopentadienyl ligands has been prepared by hydrogenation of the corresponding dimethyl complexes. The most sterically crowded members (Cp*(eta(5)-C5HMe4)ZrH2, (Cp* = (eta(5)-C5Me5)), Cp*{eta(5)- C5H3-1,3-(CMe3)(2)}ZrH2 and {eta(5)-C5H3-1,3-(CMe3)(2)}(2)ZrH2) are monomeric; those less crowded members ([Cp*{eta(5)- C5H4(CMe3)}ZrH2](2), [Cp*(THI)ZrH2](2) (THI = eta(5)- tetrahydroindenyl), and [{eta(5)-C5H3-1,3- (CHMe2)(2)}(2)ZrH2](2)) are predominantly dimeric in benzene solution. Cp*{eta(5)-C5H3-1,3-(CHMe2)(2)}ZrH2 and (eta(5)- C5HMe4)(2)ZrH2 exist as equilibrium mixtures of monomer and dimer in benzene solution. The hydride ligands rapidly exchange with D-2, affording the dideuteride complexes. Deuterium incorporation into some of the substituents on the cyclopentadienyl rings of the monomeric dihydride complexes is also observed. The X-ray structures of Cp*2HfH2, Cp*{eta(5)- C5H4(CMe3)}ZrCl2, Cp*{eta(5)-C5H3-1,3-(CHMe2)(2)}ZrCl2 and {eta(5)-C5H3-1,3-(CMe3)(2)}(2)ZrCl2 are reported.Organometallics 19991810MAY 10 ORGANOMETALLICSISI:000080435300010 1758-1759a*$Choukroun, R. Gervais, D. Raoult, Y.nhZirconium(Iii) Chemistry - Influence of Olefins in Thermolytic Behavior of (Cp27rhcl)N, (Cp2zrhch2pph2)N Polyhedron Polyhedron 19898C 13-14h POLYHEDRONISI:A1989AF80400035r374-376MTMChoukroun, R. Dahan, F. Larsonneur, A. M. Samuel, E. Petersen, J. Meunier, P.lSynthesis, X-Ray Structure, and Electrochemical Study of [(Eta- 5-C5h4c(Ch3)3)2zrh(Mu-H)]2 - Identification of the [(Eta-5- C5h4c(Ch3)3)]2zrh2 Anion Radical by Epr SpectroscopyOrganometallicsOrganometallics 1991102RFEB ORGANOMETALLICSISI:A1991EY68100003E 1511-1512RD>Choukroun, R. Zhao, J. S. Lorber, C. Cassoux, P. Donnadieu, B.piLi[Cp2Zr(C CPh)(eta(2): 1,2-PhC2C CPh)]: an anionic zirconium(II) intermediate for carbon-carbon couplingcChemical Communicationsm Chem. Commun. 200016 CHEM COMMUN ISI:0000885159000284 1803-1810n.(Chu, K. J. Soares, J. B. P. Penlidis, A.nhEffect of experimental conditions on ethylene polymerization with in-situ-supported metallocene catalyst:3Journal of Polymer Science Part a-Polymer Chemistryethylene; polymerization; in-sitz-supported metallocene catalyst; polymerization rate; molecular weight distribution ZIEGLER-NATTA CATALYSTS; MOLECULAR-WEIGHT; PROPENE; TRIALKYLALUMINUMEthylene polymerization was carried out with a novel in-situ- supported metallocene catalyst that eliminates the need for a supporting step before polymerization. The influence of the metallocene amount, aluminum to zirconium mole ratio, temperature, pressure, and cocatalyst type on polymerization kinetics and molecular weight distribution of the produced polyethylene was studied. (C) 2000 John Wiley & Sons, Inc. J. Polym. Sci. Pol. Chem. 20003810&MAY 15 J POLYM SCI A-POLYM CHEMISI:000086628900064C81-C83V81Churakov, A. V. Lemenovskii, D. A. Kuzmina, L. G.Synthesis of Sandwich and Half-Sandwich Complexes of Ti, Zr and Hf Containing Eta(5)-C(5)H(4)Sime(2)Cl Ligand - Molecular- Structure of [Ticl2(Mu-Osime(2)-Eta(5)-C5h4)](2)R*#Journal of Organometallic ChemistryJ. Organomet. Chem.1 1995 489: 1-29MAR 8 J ORGANOMETAL CHEMISI:A1995QJ12800055287-296aVPCiruelo, G. Cuenca, T. Gomez, R. Gomez-Sal, P. Martin, A. Rodriguez, G. Royo, P.Synthesis and reactivity of new silyl substituted monocyclopentadienyl zirconium complexes. X-ray molecular structure of [Zr{eta(5)-C5H4(SiMe2CH2Ph)}(CH2Ph)(3)]*#Journal of Organometallic ChemistryeJ. Organomet. Chem.g 1997 547a2tDEC 1 J ORGANOMETAL CHEMISI:0000714508000102complexes: An unusual annulation with ethynes82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl. 19973618OCT 2 ANGEW CHEM INT EDSISI:A1997YA81300027O 4234-4236g,%Ashe, A. J. Al-Ahmad, S. Kampf, J. W.YjdReaction of bis(1-substituted-1-boratabenzene)bis- (trimethylphosphine)zirconium(II) with 1,3-diynesOrganometallics Organometallicst 19991820SEP 27 ORGANOMETALLICSISI:0000830335000438|J(T#oLM^gG^^ ^^s_^]^xT^R9}5#bffkN^f\gg0Msb:5;bj+5b+bb;CbCk]#bb]}LM=FLTssz R :P:Pq1c}kuMeg ;\V@_X"h):= ?Fa Q :#_hTWohQL>6)kf;!)H0zzGEEzlG%>>)%(%T(T%(((((KKKuulIT!L Z_?h,4 .(Herrmann, W. A. Menjon, B. Herdtweck, E. 1991Chemistry of Oxophilic Transition-Metals .4. Reactivity of the Organozirconium(Iii) Complex (Mu-Eta-5-Eta-5-C10h8)[(Mu- Cl)Zr(Eta-5-C5h5)]2 with Diphenyldiazomethane, Tert-Butyl Isocyanide, and Trimethylsilyl Azide - Diazo, Cyano, and Imido ComplexesOrganometallicso107e 2134-2141eOrganometallicsmISI:A1991FW22000015 HIGHER COORDINATE CYANIDE; X-RAY STRUCTURE; MULTIPLE BONDS; MOLECULAR-STRUCTURE; CARBON-MONOXIDE; FULVALENE COMPLEXES; CRYSTAL-STRUCTURES; 7-COORDINATE MOLYBDENUM(II); TETRAVALENT ZIRCONIUM; METHYLENE COMPLEXESThe fulvalene zirconium(III) complex (mu-eta-5:eta-5- C10H8)[(mu-Cl)Zr(eta-5-C5H5)]2 (1) reacts with stoichiometric amounts of diphenyldiazomethane, N2 = C(C6H5)2, and with tert- butyl isocyanide, C = NC(CH3)3, to give the 1:1 addition products [mu-eta-1:eta-2-N2(C6H5)2](mu-eta-5:eta-5-C10H8)[(eta- 5-C5H5)ZrCl]2 (3) and [mu-eta-1:eta-2-CNC(CH3)3](mu-eta-5:eta- 5-C10H8)[(eta-5-C5H5)ZrCl]2 (4), respectively. On the other hand, the reaction of 1 with trimethylsilyl azide, (CH3)3SiN3, takes place under loss of molecular nitrogen, yielding a mixture of (mu-eta-5:eta-5-C10H8)[(eta-5-C5H5)ZrCl2]2 (5) and (mu-eta-5:eta-5-C10H8)[(mu-NSi(CH3)3)Zr(eta-5-C5H5)]2 (6). The crystal and molecular structures of 3 and 4 have been determined by X-ray diffraction methods. 3 crystallizes in a triclinic unit cell of P1BAR symmetry with a = 9.189 (1) angstrom, b = 10.808 (1) angstrom, c = 15.833 (1) angstrom, alpha = 104.93 (1)-degrees, beta = 100.35 (1)-degrees, gamma = 97.82 (1)-degrees, V = 1467 angstrom 3, Z = 2, and d(calc) = 1.598 g cm-3. 4 crystallizes in an orthorhombic crystal lattice of P2(1)2(1)2(1) symmetry with a = 8.233 (1) angstrom, b = 16.891 (2) angstrom, c = 17.312 (2) angstrom, V = 2407 angstrom 3, Z = 4, and d(calc) = 1.641 g cm-3. Both structures can be regarded as a result of diphenyldiazomethane and tert- butyl isocyanide insertion into the Zr-Zr bond of 1 with concomitant splitting (opening) of the chloride bridges. The unsaturated organic molecule acts as a bridging ligand, coordinated in a (sigma + pi) fashion. Sodium amalgam reduction of 4 in the presence of C = NC(CH3)3 unexpectedly yields the cyano complex (mu-eta-5:eta-5-C10H8)[(mu-eta-1:eta- 2-CN)Zr(eta-5-C5H5)]2 (8), whose structure has been inferred from IR and H-1 and C-13 NMR spectroscopic data.JUL ORGANOMETALLICS169-181.*#Herrmann, W. A. Morawietz, M. J. A.M^XSynthesis and Characterization of Bridged Half-Sandwich Amides of Titanium and Zirconium*#Journal of Organometallic Chemistry)J. Organomet. Chem.t 1994 482a 1-2c NOV 29 J ORGANOMETAL CHEMlISI:A1994PT19500022ZSHerzog, A. Liu,Feng-Quan Roesky,H. W. Demsar,A. Keller,K. Noltemeyer,M. Pauer, F.l 1994VPbis(mu!3$-Chloro)-tris(mu!2$-chloro)-dichloro-bis(eta$5!-1-((but-3-enyl)-2,3,4,5OrganometallicsM 1251 ZOFMAI4.Herzog, A. Roesky,H. W. Zak,Z. Noltemeyer,M. 1994hexakis(mu!2$-Fluoro)-bis(eta$5!-pentamethyl-cyclopentadienyl)-hexamethyl-di-alu Trichloro-((1R,5R,8S,11S)-(eta$5!-1,5,14,14,15,15-hexamethylpentacyclo(9.2.1.1$5Angew.Chem.,Int.Ed.Engl.33 967 WEVHOU YAXKAJ2,Herzog,A. Roesky,H. W. Jager,F. Steiner,A. 1996VPtetrakis(bis(mu!2$-Fluoro)-chloro-(eta$5!-pentamethyl-cyclopentadienyl)-zirconiu Chem.Commun.29 ZOPREB 3752-3759VOHiller, J. Thewalt, U. Polasek, M. Petrusova, L. Varga, V. Sedmera, P. Mach, K.H~Methyl-substituted zirconocene-bis(trimethylsilyl)acetylene complexes (C(5)H(5-n)Me(n))(2)Zr(eta(2)-Me(3)SiC CSiMe(3)) (n=2-5)Organometallics Organometallics  19961517AUG 20 ORGANOMETALLICSISI:A1996VD29600020 1551-1561A<5Hiller, J. Thewalt, U. Podlaha, J. Hanus, V. Mach, K.aSynthesis and crystal structures of dimeric titanium(II) bis(trimethylsilyl)acetylene complexes [(C5H5-nMen)Ti(eta(2)- Me3SiC CSiMe3)(mu-Cl)](2)(n=3-5)82Collection of Czechoslovak Chemical Communications$Collect. Czech. Chem. Commun. 19976210$OCT COLLECT CZECH CHEM COMMUNnISI:A1997YJ29500005I 1141-1142>7Hitchcock, P. B. Lappert, M. F. Lawless, G. A. Royo, B.The Synthesis and Structure of the Alkaline-Earth Metal Organic-Compounds [M(Oar)2(Thf)N] [M = Ca, N = 3 (1) or 0 - M = Ba, N = 4] and [(Ca(Nr2)(Mu-Nr2)(Thf))2], and the X-Ray Structure of (1) (Ar = C6h2but2-2,6-Me-4 - R = Sime3 - Thf = Oc4h8)>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 199017"SEP 1 J CHEM SOC CHEM COMMUNISI:A1990DY16100003474-476.LFHitchcock, P. B. Lappert, M. F. Lawless, G. A. Olivier, H. Ryan, E. J.Lipophilic Halogenozirconocene(Iii) Complexes - [(Zr[Eta- C5h3(Sime3)2-1,3]2(Mu-Cl))2], [N(Bu-Normal)4][Zr(Eta- C5h3(Sime3)2-1,3)2cl2] and [Zr(Eta-C5h3(Sime3)2-1,3)2cl2]s>7Journal of the Chemical Society-Chemical Communicationsv"J. Chem. Soc.-Chem. Commun.c 19926u$MAR 15 J CHEM SOC CHEM COMMUNuISI:A1992HK80900010)554-555.>7Hitchcock, P. B. Lappert, M. F. Lawless, G. A. Royo, B.sSynthesis and Structure of Crystalline [K(Sn(Ch2but)3)(Eta- C6h5me)3] and the 1st Nmr Spectral Observation of Sn-119-K-39 Coupling>7Journal of the Chemical Society-Chemical Communicationsh"J. Chem. Soc.-Chem. Commun.N 19936m$MAR 21 J CHEM SOC CHEM COMMUNoISI:A1993KV03000037i. 2000 5944 JAN 15 J ORGANOMETAL CHEM:ISI:000084876400021 2532-2540e4.Fischer, R. Walther, D. Gebhardt, P. Gorls, H.Reactive intermediates of the catalytic carbomagnesation reaction: Isolation and structures of [Cp2ZrEt](2)(mu-ethene), [Cp2Zr(ethene)(L)] (L = THF, pyridine), and [(indenyl)(2)Zr(ethene) (THF)] and of metallacycles with norborneneOrganometallicsOrganometallics 20001913JUN 26 ORGANOMETALLICSISI:000087804200022 Kibala1991l Kibala1991 Kickham1997Y Kickham1998 Kiely1994 Kii2000 Kim1997 Kim1997 Kim2000 Kim2000 Kim2000 Kim2000? Kimura1998I Kimura1998 King19951 King1995 King1996n King1999 Kirchbauer1999 Kirchbauer1999 Kirchbauer2000 Kirchbauer2000 Kirmse20000% Kirsten1996# Klein1996 Kleinschmidt2000 Kleinschmidt2000T Klima19884 Klobes19999Klooster1997WKlooster1999 Kloppenburg1995k Kloppenburg1996l Kloppenburg1996 Kloppenburg1997 Kluwe2000 Knuppel2000 Ko20000 Kobayashi1980 Kobayashi2000@ Koch19966 Koch2000 Koch2000 Koetzle1997W Koetzle1999 Kokko2000 Kokko2000 Kokko2001 Koller2000 Komon2000 Komon2000~ Komon2001Kondakov1995Kondakov1995Kondakov1996Kondakov1996Kondakov1996Kondakov1996#Kooijman1996X Kool1986W Kool19874 Koppe1996 Koppl2000 Koppl2001MKordatos19971 Kosacki2000 Kotora20000? Koyama19983 Kozmina1998 Kraus1983/ Kremer1995, Kremer1996 Kresse20000y Kropp1982z Kropp1982z Kropp1983} Kropp1983 Kruger19808w Kruger1982x Kruger1982 Kruger19833} Kruger1983v Kruger1984 Kruger1988 Kruger19898p Kruger19909S Kruger19909 Kruger19939 Kruger199393 Krut'ko1998' Krut'ko1998Kryukova2000 Kubista1999 Kubista2000 Kuhl2000 Kukral2000B Kulikov1995C Kulikov1995Kulikova1989Kulikova1990 Kunz20002k Kupec1996l Kupec1996 Kupfer19988 Kupfer199885 Kupfer199996 Kupfer19999 Kupfer1999 Kupfer19999 Kupfer2000>Kurihara1985w Kuroda2001Kuz'mina199663Kuz'mina1998%Kuz'mina1998rKuz'mina2001P Kuzmina1995J Kuzmina1996 Labed1989 Lachicotte1999 Lachicotte2000a Lam1999a Lam1999 Lam2000 Lamouroux2000 Lan2000 Lancaster1997 Lancaster1998 Lancaster1999X Lanfranchi200003 Lange1998 Lange2000 Lange2000 Lanza1996n Lanza1999 Lanza2000/ Lappert19810 Lappert19811 Lappert1981 Lappert1984l Lappert1984 Lappert1986( Lappert1986 Lappert1987' Lappert1987 Lappert1989_ Lappert1990^ Lappert1991 Lappert1992Z Lappert1993 Lappert1994X Lappert1994 Lappert1995 Lappert1995 Lappert1996Q Lappert1996 Lappert1997 Lappert1998 Lappert1998H Lappert1998 Lappert1999 Lappert1999 Lappert1999 Lappert1999 Lappert2000! Lappert2000X Lara-Sanchez20000, Larsen1974D Larsonneur1991 Laschi19999[ Lasser19833Z Lasser19859u Latronico1998Lattanzi20000` Lauher1976Lavalley20000 Lawless1987_ Lawless1990\ Lawless1991] Lawless1991^ Lawless1991 Lawless1992Y Lawless1993Z Lawless1993X Lawless1994P Lawless1996Q Lawless1996R Lawless1996S Lawless1996T Lawless1996U Lawless1996V Lawless1996W Lawless1996J Lawless1997K Lawless1997L Lawless1997M Lawless1997N Lawless1997O Lawless1997/ Lawless1998H Lawless1998I Lawless1998F Lawless20008 Lee1992< Lee1992 Lee1996 Lee1999 Lee2000 Lee2000 Lee2000 Lee2000 Lee2000v Lee2001 Lefeber1995 Lefeber1995 Lefeber1995 Lefeber1996 Lefeber1996 Lefeber1996 Lefeber1996 Lefeber1996 Lefeber1997 Lefeber1997tLefebvre2001b|Lefebvre200103 Leffers1987 Lehmus2000 Lehmus2000 Lehmus20000 Lehmus2001 Leino2000 Leino2001g Lemenovskii19874j H<Rt127-141.Schneider, H. Puchta, G. T. Kaul, F. A. R. Raudaschl-Sieber, G. Lefebvre, F. Saggio, G. Mihalios, D. Herrmann, W. A. Basset, J. M.Immobilization of eta(5)-cyclopentadienyltris(dimethylamido) zirconium polymerization catalysts on a chlorosilane- and HMDS- modified mesoporous silica surface: a new concept for supporting metallocene amides towards heterogeneous single- site-catalysts0)Journal of Molecular Catalysis a-Chemical*$heterogeneous catalysts; metallocene; polymerization; surface chemistry; leaching SOLUBLE ZIEGLER-CATALYSTS; OLEFIN POLYMERIZATION; ETHYLENE POLYMERIZATION; PROPENE POLYMERIZATION; ZIRCONOCENE CATALYSTS; ANSA-METALLOCENES; MOLECULAR-WEIGHT; HEXAMETHYLDISILAZANE; METHYLALUMOXANE; CYCLODEXTRINThe modification of a mesoporous silica surface with Si(Ind)(CH3)(2)Cl and the immobilization of CpZr(NMe2)(3) on this surface was studied via IR-spectroscopy. To reduce side reactions, the indenyl-modified silica was reacted with hexamethyldisilazane (HMDS) under IR-control before the CpZr(NMe2)(3)-immobilization. The role of the hydroxyl group protection with HMDS is discussed. The surface modifications have been repeated via Schlenk technique at the same conditions and the surface modifications were studied with C-13 CP MAS- NMR, H-1 MAS-NMR, elemental-, SEM- and BET-analysis. The surface species of the resulting catalysts are discussed. The precatalysts have been treated with methylaluminoxane (MAO) (Al:Zr (mol:mol) = 500:1) and the resulting Zr contents (leaching-effect) are discussed. All catalysts have been tested in ethylene and propylene polymerization. (C) 2001 Elsevier Science B.V. All rights reserved.J. Mol. Catal. A-Chem. 2001 170 1-2 MAY 14 J MOL CATAL A-CHEMISI:000168613100014199-200 @:Schrock, R. R. Schattenmann, F. Aizenberg, M. Davis, W. M.Synthesis of group 4 complexes that contain the tridentate diamido ligands [(ArNCH2CH2)(2)O](2-) (Ar=C6H3-Me-2-2,6 or C6H3Pri;(2)-2,6)Chemical Communications Chem. Commun.y 19982tJAN 21 CHEM COMMUNISI:000071788200017i163-173 :4Schrock, R. R. Liang, L. C. Baumann, R. Davis, W. M.d]Synthesis of Group 4 [(RN-o-C6H4)(2)O](2-) complexes where R is SiMe3 or 0.5 Me2SiCH2CH2SiMe2o*#Journal of Organometallic ChemistryoJ. Organomet. Chem. 1999 591A 1-2DEC 5 J ORGANOMETAL CHEMISI:000084118500017a 3649-3670nTMSchrock, R. R. Baumann, R. Reid, S. M. Goodman, J. T. Stumpf, R. Davis, W. M..Synthesis of titanium, zirconium, and hafnium complexes that contain diamido donor ligands of the type [(t-BuN-o- C6H4)(2)O](2-) and an evaluation of activated versions for the polymerization of 1-hexeneOrganometallicsOrganometallics 19991818AUG 30 ORGANOMETALLICSISI:000082555300017428-437 <5Schrock, R. R. Seidel, S. W. Schrodi, Y. Davis, W. M.Synthesis of zirconium complexes that contain the diamidophosphine ligands [(Me3SiNCH2CH2)(2)PPh](2-) or [(RNSiMe2CH2)(2)PPh](2-) (R = t-Bu or 2,6-Me2C6H3)rOrganometallics9Organometallics 19991830FEB 1 ORGANOMETALLICSeISI:000078873600020a 1204-1204 <5Schrock, R. R. Seidel, S. W. Schrodi, Y. Davis, W. M. Synthesis of zirconium complexes that contain the diamidophosphine ligands [(Me3SiNCH2CH2)(2)PPh](2-) or [(RNSiMe2CH2)(2)-PPh](2-) (R = t-Bu or 2,6-Me2C6H3) (vol 18, pg 430, 1999)eOrganometallicsOrganometallics 20001960MAR 20 ORGANOMETALLICSISI:000086082900038N736-747 >8Schweder, B. Walther, D. Dohler, T. Klobes, O. Gorls, H.Salicylidene-imine-zirconium(IV) complexes in combination with methylalumoxane as catalysts for the conversion of hexa-1,5- diene: Adjusting of the catalytic activity4.Journal Fur Praktische Chemie-Chemiker-Zeitung J. Prakt. Chem.-Chem. Ztg. 1999 341p82J PRAKT CHEM-CHEM ZTG)ISI:000083817300004 ;'&pHNc103-105NPJDiamond, G. M. Green, M. L. H. Mountford, P. Popham, N. A. Chernega, A. N.New Metallocene Compounds of Zirconium and Hafnium Showing Unusual Ansa-Ligand Coordination - X-Ray Crystal-Structures of [((Ch2)(5)C(Eta(5)-C5h4)(Eta(2)-C9h6))Zr(Eta(5)-C5h5)Cl] and [(Me(2)C(Eta(5)-C5h4)(Eta(3)-C13h8))Zr(Eta(5)-C5h5)Cl]>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 19941"JAN 7 J CHEM SOC CHEM COMMUNISI:A1994MT19700051921-938 B8Canadian Journal of Chemistry-Revue Canadienne De Chimie692J357-362C$Can. J. Chem.-Rev. Can. Chim.5ISI:A1991FA87600027FEB CAN J CHEM192-POLYDing, Y. W. Corey, J. Y.The Generation of High Mw Poly(Di-N-Butylstannane) from Dehydrogenative Condensation of Bu2snh2 in the Presence of Cp2mcl2 (M = Zr, Hf)/N-Buli:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1995 2101& AUG 20 2 ABSTR PAP AMER CHEM SOCISI:A1995RP25901458 3855-3858 .(Dinnebier, R. E. Behrens, U. Olbrich, F.Solid state structures of cyclopentadienyllithium, -sodium, and -potassium. Determination by high-resolution powder diffractioniOrganometallicstTMMAIN-GROUP ELEMENTS; SIMPLEST METALLOCENE; LITHOCENE ANION; ALKALI; COMPLEXEStThe structures of MCp (M = Li, Na, K; Cp = cyclopentadienyl), some of the most important precursors in, synthetic organometallic chemistry, have been, investigated. All three compounds form polymeric ''multidecker structures''. In LiCp and NaCp the metal atoms form a ''string of pearls'' whereas the potassium atoms in KCp are arranged in a zigzag chain that interacts with neighboring chains.Organometallics 19971617AUG 19 ORGANOMETALLICSISI:A1997XR55900020 2915-2918D:4Dinnebier, R. E. Neander, S. Behrens, U. Olbrich, F.LFSolid-state structures of base-free indenyllithium and fluorenylsodiumOrganometallicsOrganometallics 19991815JUL 19 ORGANOMETALLICSISI:000081625500030 6Ypwn9v 3106-3127\PJYstenes, M. Eilertsen, J. L. Liu, J. K. Ott, M. Rytter, E. Stovneng, J. A.}Experimental and theoretical investigations of the structure of methylaluminoxane (MAO) cocatalysts for olefin polymerization:3Journal of Polymer Science Part a-Polymer Chemistrymethylaluminoxane; aluminoxanes; metallocene; methylaluminoxane catalysts; ethene polymerization; olefin polymerization; infrared spectroscopy; cocatalysts; polyethylene; metallocene catalyst; density functional theory ZIEGLER-NATTA CATALYSIS; ETHYLENE POLYMERIZATION; ZIRCONOCENE DICHLORIDE; PHASE-SEPARATION; TRIMETHYLALUMINUM; METHYLALUMOXANE; ALUMINUM; ALUMINOXANE; ALUMOXANES; HYDROLYSISThe structure of methylaluminoxane (MAO), used as a cocatalyst for olefin polymerization, has been investigated by Raman and in situ IR spectroscopy, polymerization experiments, and density functional calculations. From experimental results, a number of quantum chemical calculations, and bonding properties of related compounds, we have suggested a few Me18Al12O9 cage structures, including a highly regular one with C-3h symmetry, which may serve as models for methylaluminoxane solutions. The cages themselves are rigid but may contain up to three bridging methyl groups on the cage surfaces that are labile and reactive. Bridging methyls were substituted with Cl atoms to form a compound otherwise similar to MAO. Chlorinated MAO is unable to activate a metallocene catalyst, even in the presence of trimethylaluminum (TMA), but allows subsequent activation by regular MAO. With bis(pentamethylcyclopentadienyl)zirconium dichloride, MAO and TMA seem to influence chain termination independently. Several findings previously poorly explained are rationalized with the new model, including the observed lack of reaction products with excess TMA. (C) 2000 John Wiley & Sons, Inc. J. Polym. Sci. Pol. Chem. 20003817$SEP 1 J POLYM SCI A-POLYM CHEMISI:000088771200012313-316 TNYu, P. H. Murphy, E. F. Roesky, H. W. Lubini, P. Schmidt, H. G. Noltemeyer, M.New fluoride derivative of a dinuclear titanium(III) fulvalene complex: Crystal structure of [(eta(5)-C5H5)Ti(mu-F)](2)(mu- eta(5):eta(5)-C10H8)OrganometallicstOrganometallicso 1997163iFEB 4 ORGANOMETALLICS(ISI:A1997WG13800009( 3642-3646(!Yuchi, A. Mizuno, Y. Yonemoto, T. d]Ligand-exchange chromatography at Zirconium(IV) immobilized on IDA-type chelating polymer gelAnalytical Chemistry Anal. Chem.h 20007215AUG 1 ANAL CHEMISI:000088520400054N 6466-6467DXQZaegel, F. Gallucci, J. C. Meunier, P. Gautheron, B. Sivik, M. R. Paquette, L. A.,Preparation, X-Ray Crystallographic Analysis, and Stereoselective Electrophilic Capture of Coordinatively Isomeric Exo-Lithium Complexes of Isodicyclopentadiene.(Journal of the American Chemical SocietytmSTRUCTURAL CHARACTERIZATION; NMR; CYCLOPENTADIENYLLITHIUM; LIGAND; TETRAHYDROFURAN; MOLECULES; COMPOUND; MNDOhJ. Am. Chem. Soc.o 1994 116514JUL 13 J AMER CHEM SOCISI:A1994NX54800070l298-311Ab[Zanotti-Gerosa, A. Solari, E. Giannini, L. Floriani, C. Re, N. Chiesi-Villa, A. Rizzoli, C.rkTitanium-carbon functionalities on an oxo surface defined by a calix[4]arene moiety and its redox chemistrynInorganica Chimica ActaOInorg. Chim. Acta9 1998 270  1-2NAPR 2 INORG CHIM ACTAISI:000072720900038a 5499-55092,Zhang, S. Piers, W. E. Gao, X. L. Parvez, M.The mechanism of methane elimination in B(C6F5)(3)-Initiated monocyclopentadienyl-ketimide titanium smd related olefin polymerization catalysts .(Journal of the American Chemical SocietyJ. Am. Chem. Soc.  2000 122a23JUN 14 J AM CHEM SOCISI:000087792900011C 1941-1947sXQZhang, F. Mu, Y. Wang, J. H. Shi, Z. Bu, W. M. Hu, S. R. Zhang, Y. T. Feng, S. H.Synthesis and crystal structures of unbridged bis(4-R-1,2- diphenylcyclopentadienyl)zirconium dichlorides (R = phenyl, cyclohexyl), and catalysis for olefin polymerization Polyhedron Polyhedron 200019 16-170SEP 15 POLYHEDRON5ISI:000089771100008179-183.*#Zhang, L. N. Wang, X. F. Qin, Q. Z.d>7Density functional calculations on the Zr-CO2 complexesf.'Journal of Molecular Structure-TheochemTheochem-J. Mol. Struct. 2000 505"JUN 26 J MOL STRUC-THEOCHEMISI:0000879496000170 8093-8094r82Zhang, X. W. Zhu, Q. M. Guzei, I. A. Jordan, R. F.TMGeneral synthesis of racemic Me2Si-bridged bis(indenyl) zirconocene complexes.(Journal of the American Chemical SocietyXRMETALLOCENE CATALYSTS; POLYMERIZATION; DERIVATIVES; REACTIVITY; ZIRCONIUM; LIGANDSJ. Am. Chem. Soc. 2000 12233AUG 23 J AM CHEM SOCISI:000089082500036 641-644 D>Zhang, F. Mu, Y. Zhang, Y. T. Chen, C. X. Zhai, H. M. Hong, H.A sterically hindered zirconocene complex (1,2- Ph2C5H3)(2)ZrCl2: Synthesis, structure and properties as olefin polymerization catalystChinese Chemical LettersRKzirconium complex; metallocene catalyst; olefin polymerization METALLOCENESiyAn unbridged zirconocene complex bis(1,2- diphenylcyclopentadienyl)zircon dichloride [(1,2-Ph-2- C5H3)(2)ZrCl2] 1 has been synthesized and structurally characterized. When activated by MAO, 1 produces ultra-high molecular weight polyethylene with high melting transition temperature, as well as atactic oligopropylene with average molecular weight of similar to 1150 g mol(-1).Chin. Chem. Lett. 2000117JUL CHIN CHEM LETTISI:000088176300026179-181 PJZhang, F. Mu, Y. Bu, W. M. Zhao, L. G. Chen, C. X. Zhai, H. M. Yang, G. D.VPA new zirconocene complex and its catalytic properties for olefin polymerization0)Chemical Research in Chinese Universitiesf_zirconium; metallocene; olefin polymerization; catalysis; polyethylene; polypropylene PROPYLENEChem. Res. Chin. Univ. 2000162l MAY CHEM RES CHINESE UNIVeISI:000087467300016. 1994bis(mu!2$-Chloro)-tetrachloro-bis(eta$5!-pentamethyl-cyclopentadienyl)-di-zircon Aqua-(eta$5!-(2-methoxyethyl)-cyclopentadienyl)-trichloro-zirconium tetrahydrofutJ.Organomet.Chem.t 480z C10RIYHAI, POSZIG347-352E:3Matsubayashi, G. E. Nakano, M. Saito, K. Tamura, H.ohbElectrical conductivities of oxidized eta(5)-cyclo-pentadienyl- metal complexes with C8H4S8 ligand,&Molecular Crystals and Liquid Crystals Mol. Cryst. Liquid Cryst.. 2000 3430MOL CRYST LIQUID CRYSTISI:000089196100005S554-555TNMatsui, S. Mitani, M. Saito, J. Matsukawa, N. Tanaka, H. Nakano, T. Fujita, T.|uPost-metallocenes: Catalytic perfomance of new bis(salicylaldiminato) zirconium complexes for ethylene polymerizationChemistry Lettersa Chem. Lett.P 20005:MAY 5 CHEM LETT8ISI:000087378400057N 51-58.60Mattheis, C. van der Zeijden, A. A. Frohlich, R.^XMonocyclopentadienyl and mono(2-methoxyethylcyclopentadienyl) zirconium methyl complexes*#Journal of Organometallic Chemistry J. Organomet. Chem.e 2000 602 1-2oMAY 15 J ORGANOMET CHEM0ISI:000087713900008U185-188.@:Mazo, G. N. Rybakov, V. B. Ilinskii, A. L. Troyanov, S. I.tmSynthesis and Structure of Tetrachloro(Ortho-Phenanthrolin)- Zirconium and Products of Its Partial Hydrolysisa Koordinatsionnaya KhimiyaKoord. Khimiya 1990162G KOORD KHIMISI:A1990CP889000069 f  2142-2148S>8Wielstra, Y. Gambarotta, S. Spek, A. L. Smeets, W. J. J.D=Binuclear Zirconium(Iii) and Zirconium(Iv) Complexes - Mild Oxidation of Low-Valent Zirconium as a Synthetic Pathway to a Class of Trivalent and Tetravalent Zirconium Fulvalene Complexes - Molecular-Structures of [Eta-5-Eta-5- C10h8][Cpzrsph]2, [Eta-5-Eta-5-C10h8][Cpzr(Ch3)2]2, and [Eta-5- Eta-5-C10h8][Cpzr]2[Mu-S]2OrganometallicsOrganometallics 199097JUL ORGANOMETALLICSISI:A1990DN65800027572-577t.'Wielstra, Y. Gambarotta, S. Spek, A. L.Monocyclopentadienylzirconium and Monocyclopentadienylhafnium Alkyls - Synthesis, Hydrogen-Transfer Reactions, and Catalytic Features in the Reactivity with Alpha-Olefins - X-Ray Structure of Cpzr(Eta-4-Butadiene) (1,2-Bis(Dimethylphosphino)Ethane ClOrganometallicsOrganometallics 199093MAR ORGANOMETALLICSISI:A1990CU73500007183-190.F?Wielstra, Y. Duchateau, R. Gambarotta, S. Bensimon, C. Gabe, E. A Binuclear Zirconium Fulvalene Tetraallyl Complex - the Preparation and the Molecular-Structure of [Eta-5-Eta-5- C10h8][Cpzr(Eta-1-Ch2chch2)(Eta-3-Ch2chch2)]2*#Journal of Organometallic ChemistryiJ. Organomet. Chem.u 1991 418h2m OCT 22 J ORGANOMETAL CHEMISI:A1991GP43300006 3161-3172t6/Wigum, H. Tangen, L. Stovneng, J. A. Rytter, E.yEthene homopolymerization and copolymerization with 1-hexene for all methyl-substituted (RnC5H5-n)(2)ZrCl2/MAO catalytic systems: Effects of split methyl substitution:3Journal of Polymer Science Part a-Polymer Chemistrycopolymerization; zirconocene catalyst; methyl-substituted catalyst; density functional theory; comonomer response; ethene; 1-hexene; chain termination; Fourier transform infrared (FTIR); nuclear magnetic resonance (NMR); gel permeation chromatography (GPC); differential scanning calorimetry (DSC); successive self-nucleation/annealing (SSA) METALLOCENE CATALYSTS; ETHYLENE POLYMERIZATION; OLEFIN COPOLYMERIZATION; ALPHA-OLEFIN; 1-OCTENE; METHYLALUMINOXANE; CRYSTALLIZATION; TERMINATION; BEHAVIOR; KINETICS`ZEthene homopolymerization and copolymerization with 1-hexene were catalyzed by methyl-substituted cyclopentadienyl (Cp) zirconium dichlorides, (RnC5- H5-n)(2)ZrCl2 (R-n = H, Me, 1,2- Me-2, 1,3-Me-2, 1,2,3-Me-3, 1,2,4-Me-3, Me-4, or Me-5), and methylaluminoxane. The polymers were characterized with Fourier transform infrared, nuclear magnetic resonance, gel permeation chromatography, and differential scanning calorimetry techniques. Generally, an increasing number of methyl substituents on the Cp ligand results in lower l-hexene incorporation in the copolymer. The two catalysts with split methyl substitution (R-n = 1,3-Me-2 and R-n = 1,2,4-Me-3) show a higher comonomer response than their disubstituted and trisubstituted counterparts (R-n = 1,2-Me-2 and R-n = 1,2,3-Me- 3). They even incorporate more 1-hexene than R-n = H and R-n = Me. These findings are qualitatively in agreement with the results of a theoretical study based on density functional calculations. The presence of comonomer does not influence the termination reactions after the insertion of ethene. There is more frequent termination after each hexene insertion with increasing comonomer incorporation except for the two catalysts with split methyl substituents. The termination probability per inserted comonomer is highest for the less substituted catalysts. (C) 2000 John Wiley & Sons, Inc. J. Polym. Sci. Pol. Chem. 20003817$SEP 1 J POLYM SCI A-POLYM CHEMISI:000088771200015B;Wilkinson, G. Pauson, P. L. Birmingham, J. M. Cotton, F. A.c 1953.(Journal of the American Chemical Society75 1011*$Zirconium, Zr, Zirconocene dibromide& D:\My Documents\ENDNOTE\ZrII.enl382-INOR,&Winter, C. H. Zhou, X. X. Dobbs, D. A.~xSimple Synthesis of Cyclopentadienyl Titanium, Zirconium and Hafnium Complexes by Regiospecific Silyl Cleavage Reactions:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1989 198C$SEP 10 ABSTR PAP AMER CHEM SOCISI:A1989DG64201897145-151.,&Winter, C. H. Dobbs, D. A. Zhou, X. X.Hindered Cyclopentadienyl Rotation in Hexakis(Trimethylsilyl)Metallocene Dichlorides of Zirconium and Hafnium - Evidence for Complete Rotation of the Tris(Trimethylsilyl)Cyclopentadienyl Ligands*#Journal of Organometallic ChemistryaJ. Organomet. Chem.r 1991 403l 1-2 FEB 12 J ORGANOMETAL CHEMISI:A1991EZ79600015210-214n82Winter, C. H. Zhou, X. X. Dobbs, D. A. Heeg, M. J.Cyclopentadienylmetal Trichloride Formation Versus Metallocene Dichloride Formation in the Reactions of Silylated Cyclopentadienes with Zirconium and Hafnium Chlorides - Crystal-Structure of (1,3- Bis(Trimethylsilyl)Cyclopentadienyl)Titanium TrichlorideOrganometallicsOrganometallicsG 19911010JAN ORGANOMETALLICS1ISI:A1991ER63000051X<ӐiYN#Journal of OrganomeӐiYӐ`kY275-286.:3Miola-Delaite, C. Colomb, E. Pollet, E. Hamaide, T.Anionic ring opening polymerization of oxygenated heterocycles with supported zirconium and rare earths alkoxides as initiators in protic conditions. Towards a catalytic heterogeneous process5Macromolecular Symposia0Macromol. Symp. 2000 1533MAR MACROMOL SYMPOSIA(ISI:000087720400026429-434.\UMorozova, O. S. Streletskii, A. N. Berestetskaya, I. V. Leonov, A. V. Kryukova, G. N.vpEffect of reaction medium on the mechanochemical decomposition of ZrH2 and on the reactivity of hydride hydrogenRKMetastable, Mechanically Alloyed and Nanocrystalline Materials, Pts 1 and 2- 2000 343-302+MATERIALS SCIENCE FORUM 1&2 MATER SCI FORUM0ISI:000089403900068141-146N:4Morton, C. Gillespie, K. M. Sanders, C. J. Scott, P.vpComplexes of zirconium with aryl substituted triamidoamines: molecular structures of amide and alkyl derivatives*#Journal of Organometallic Chemistry0J. Organomet. Chem.E 2000 606220JUL 28 J ORGANOMET CHEM0ISI:000089316800006L 2405-2410|vMukherjee, P. Chattopadhyay, S. K. Chatterjee, S. K. Meikap, A. K. Barat, P. Bandyopadhyay, S. K. Sen, P. Mitra, M. K.ngMicrostructural studies on lattice imperfections in deformed zirconium-base alloys by X-ray diffractionZTMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science81Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.I 20003110OCT METALL MATER TRANS AISI:000089917400001571-582.@:Munoz-Escalona, A. Ramos, J. Cruz, V. Martinez-Salazar, J.{Effect of a second ethylene molecule on the insertion of ethylene in zirconocene catalyst systems: A QM semiempirical study:3Journal of Polymer Science Part a-Polymer ChemistryJCethylene insertion; homogeneous metallocene; semiempirical calculations; zirconocenes; polymerization; quantum calculations EFFECTIVE CORE POTENTIALS; HOMOGENEOUS OLEFIN POLYMERIZATION; ZIEGLER-NATTA CATALYSTS; KAMINSKY-TYPE CATALYSTS; METALLOCENE CATALYSTS; TRIGGER MECHANISM; ALPHA-OLEFINS; COMPLEXES; EXCHANGE; ZIRCONIUMThe PM3(tm) semiempirical method was used to show the effect, of a second ethylene molecule in the backside position on the frontside ethylene insertion in the Cp2Zr-Pr-n(+) gamma-agostic resting state. The same calculations without a companion second ethylene molecule were performed to compare geometrical parameters, energies, and electrostatic charges. The results obtained show that the geometrical parameters for both cases were identical, but differences in the electrostatic charges were observed. The energy profile presented two barriers, the first corresponding to the alkyl-chain rotation along the Zr-C alpha bond and the second relating to the insertion process itself. The presence of a companion second ethylene molecule affected the energetic profile by lowering the energy barrier of the first stage with respect to the process without the companion second ethylene molecule. These results provide some theoretical support to the well-known trigger effect. (C) 2000 John Wiley & Sons, Inc.  J. Polym. Sci. Pol. Chem.i 2000383$FEB 1 J POLYM SCI A-POLYM CHEMISI:000085010300022R = CMe3 or CHCMe(1-C10H7))r:3Journal of the Chemical Society-Dalton TransactionsU"J. Chem. Soc.-Dalton Trans.0 200012J CHEM SOC DALTON TRANS0ISI:000088758400015 1789-1793*#Dahlmann, M. Frohlich, R. Erker, G..tmReaction of a zirconocene(butadiene)borate-betaine single- component Ziegler catalyst with trimethylphosphane .'European Journal of Inorganic ChemistryaEur. J. Inorg. Chem. 20008MAUG EUR J INORG CHEMISI:000088396700016t]'Zlhn ߐPjYZ ,PjY L%mYZPW, |1@, Carrillo-Hermosilla, F.  ߐPjYZ ,PjYL%mYZPW115-123.*#Alt, H. G. Fottinger, K. Milius, W.KSynthesis, characterization and polymerization potential of unbridged and bridged half-sandwich complexes of zirconium containing N-donor ligandsE*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1998 564 1-28 AUG 14 J ORGANOMETAL CHEMMISI:0000755718000169155-168NGAmor, J. I. Cuenca, T. Galakhov, M. GomezSal, P. Manzanero, A. Royo, P. Neutral and cationic di(tert-butyl)cyclopentadienyltitanium, zirconium and hafnium complexes - Dynamic NMR study of the ligand-free cations [M(1,3-Bu-t(2)-eta(5)-C5H3)(eta(5)- C5H5)(CH3)](+) (M=Zr, Hf)*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1997 535 1-2 MAY 15 J ORGANOMETAL CHEMISI:A1997XH95000022 4765-4767 (!Amor, F. Spaniol, T. P. Okuda, J.dRemarkably robust group 4 metal half-sandwich complexes containing two higher alkyl ligands: X-ray structure and reactivity of the di-n-butyl complex [Hf(eta(5):eta(1):eta(1)- C5Me4SiMe2NCH2CH2OMe)Bu-n(2)]5OrganometallicsROrganometallicso 19971622OCT 28 ORGANOMETALLICSISI:A1997YD66500003lC37-C39.60Antinolo, A. Lappert, M. F. Winterborn, D. J. W.High-Yield Syntheses and Characterization of a New Zirconocene(Ii) Dicarbonyl [Zr(Eta-C5h3(Sime3)2)2(Co)2], a Convenient Precursor to Various Zirconocene(Ii or Iv) Complexes*#Journal of Organometallic Chemistry7J. Organomet. Chem.E 1984 272134J ORGANOMETAL CHEMISI:A1984TL10900012N 1463-1472RAntinolo, A. Lappert, M. F. Singh, A. Winterborn, D. J. W. Engelhardt, L. M. Raston, C. L. White, A. H. Carty, A. J. Taylor, N. J.Metallocene Derivatives of Early Transition-Elements .4. Synthesis and Crystal-Structures of a Series of Zirconocene(Iv) Halides [Zr(Eta-C5h4sime3)2cl2], [Zr(Eta-C5h4sime3)2br2] and [Zr(Eta-C5h3(Sime3)2-1,3)2f2], [Zr(Eta-C5h3(Sime3)2-1,3)2br2], Zr(Eta-C5h3(Sime3)2-1,3)2i2:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19876"JUN J CHEM SOC DALTON TRANSISI:A1987J326800026 1601-1606TAntinolo, A. Bristow, G. S. Campbell, G. K. Duff, A. W. Hitchcock, P. B. Kamarudin, R. A. Lappert, M. F. Norton, R. J. Sarjudeen, N. Winterborn, D. J. W. Atwood, J. L. Hunter, W. E. Zhang, H.eNGSynthetic and Structural Studies on Some Organic-Compounds of Zirconiumi Polyhedron Polyhedron 19898. 13-14  POLYHEDRONISI:A1989AF80400005C 5219-5224|Antinolo, A. Carrillo-Hermosilla, F. Corrochano, A. E. Fandos, R. Fernandez-Baeza, J. Rodriguez, A. M. Ruiz, M. J. Otero, A.New monocyclopentadienyl complexes of titanium(IV) and zirconium(IV) with chelating pyrimidinethiolate, oxypyrimidine, and oxypyridine ligands. molecular structure of [Zr(eta(5)- C5Me5)(eta(2)-O,N-ON2C6H7)(3)]OrganometallicsOrganometallics 19991825DEC 6 ORGANOMETALLICSISI:000084171900005a p0tvz|{zx wܐiYPAccounts of CheAccounts Chem. Res.l ResearchܐiY 3300-33100)Erker, G. Wicher, J. Engel, K. Kruger, C.0*(S-Trans-Eta-4-Diene)Zirconocene Complexes Chemische Berichte-RecueilChem. Ber.-Recl. 1982 11510 CHEM BER-RECLISI:A1982PL76000007 3311-33232,Erker, G. Engel, K. Kruger, C. Chiang, A. P.HBReactivity and Structure of (S-Cis-1,3-Diene)Zirconocene Complexes Chemische Berichte-RecueilChem. Ber.-Recl. 1982 115C10 CHEM BER-RECLISI:A1982PL76000008i 2437-2446rErker, G. Kropp, K.lNGDyotropic Rearrangements of Dinuclear Mu-Aldehyde-Zirconocene Complexesr Chemische Berichte-RecueilChem. Ber.-Recl. 1982 115I7C CHEM BER-RECLnISI:A1982NY46100005a 1285-1292Erker, G. Rosenfeldt, F.VPRadical Reaction Paths in Thermically-Induced Reactions of Zirconocene Complexes Tetrahedrone Tetrahedron. 1982389I TETRAHEDRONMISI:A1982NV85600019N 1277-12782+Erker, G. Berg, K. Treschanke, L. Engel, K.F?Convenient Route to Monocyclopentadienylzirconium(Iv) ComplexestInorganic Chemistry Inorg. Chem. 1982213H INORG CHEMISI:A1982NE35000085a 1555-1561R6/Erker, G. Kropp, K. Atwood, J. L. Hunter, W. E.AReactions of Vinylzirconocene Complexes with a Zirconium Hydride - the Unexpected Formation of [Mu-(Beta-Eta-1- Alpha,Beta-Eta-2-Styryl] (Mu-Chloro)Bis[Bis(Eta-5- Cyclopentadienyl)-Zirconium], a Binuclear (Olefin)Zirconocene ComplexOrganometallicsaOrganometallicsh 1983211ORGANOMETALLICSBISI:A1983RR26300013e455-456TRKErker, G. Berg, K. Kruger, C. Muller, G. Angermund, K. Benn, R. Schroth, G.(Eta-3-Allyl)(Eta-4-Butadiene)(Eta-5-Cyclopentadienyl)- Zirconium, a System of Isomeric Monocyclopentadienylzirconium(Ii) Compounds82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.  1984236ANGEW CHEM INT EDIISI:A1984TE12000022 1383-1397S.'Erker, G. Berg, K. Benn, R. Schroth, G.iNGFormation of Chiral Mono(Eta-5-Cyclopentadienyl)Zirconium(Ii) Complexes Chemische Berichte-RecueilChem. Ber.-Recl. 1985 118C4c CHEM BER-RECL0ISI:A1985AGG2700008EngErker,G. Sarter,C. Albrecht, M. Dehnicke, S. Kruger, C. Raabe, E. Schlund, R. Benn, R. Rufin, A. 1989HBTrichloro-(eta$5!-cyclopentadienyl)-bis(tetrahydrofuran)-zirconiumF?15-Crown-5 diaqua-trichloro-(eta$5!-cyclopentadienyl)-zirconium 377M C55 VEBWUU VEHLEZf`Erker,G. Sarter,C. Albrecht,M. Dehnicke, S. Kruger, C. Raabe, E. Schlund,R. Benn,R. Rufin,A. 1990LFTrichloro-(eta$5!-cyclopentadienyl)-bis(dimethylformamide-O)-zirconiumJ.Organomet.Chem.f 382 89 VEHLOJ 2<y Scettri, A.Schaefer, W. P.Schamberger, J.Scharmann, T. G.Schattenmann, F.Schattenmann, F. J.Schauwienold, A. M. Schick, B.Schleyer, P. V.Schliessburg, C.Schloss, J. D. Schlund, R. Schmid, G.Schmidt, H. G. Schneider, H. Schnockel, H. Schottek, J.Schrock, R. R. Schrodi, Y. Schroth, G.Schultz, A. J. Schumann, H. Schwartz, J. Schweder, B.Scopelliti, R. Scott, P. Scowen, I. J. Sebastian, A. Sedmera, P. Segre, A. Seidel, S. W. Seidel, W. W. Seki, T. Sen, P.Sengupta, S. K.Seppala, J. V. Serrano, R.Shaltout, R. M. Shang, M. Y.Sheldrick, G. M.Sheridan, P. H.Shestakov, A. F. Shi, X. Shi, Z. Shibata, K. Shilov, A. E. Shin, S. H. Shiono, T. Shur, V. B. SI, Troyanov Sikora, D. J. Silong, S. Silveira, A. Sim, G. A.Simonov, G. N. Mazo M. A.Simonov, M. A.Simpson, S. J. Singh, A.Sinnema, P. J. Sironi, A. Sisak, A. Sita, L. R. Sitzmann, H. Sivik, M. R.Skelton, B. W. Skibbe, V.Slebodnick, C.Smeets, W. J. J.Smirnov, V. A. Smith, J. D. Smith, J. M.Soares, J. B. P. Soga, K. Solari, E. Solari, G. Soleil F Sommer, R. D. Somoza, F. B. Sone, M. Song, F. Q. Song, X. J. Sorkau, A. Sostero, S. Souter, J.Spaniol, T. P.Spannenberg, A. Spek, A. L. Spek, A.L.Srivastava, A. K. Stalke, D. Stammler, A.Stammler, H. G. Stauffert, P.Steimle, T. C. Stein, B. K. Steiner, A.Stephan, D. W.Stephens, A. H. H. Stepnicka, P. Stern, C. L.Stoebenau, E. J.Stollmaier, F. Stone, C.Stone, F. G. A.Stovneng, J. A. Strahle, J.Straub, A. W. G. Strauch, J.Streitwieser, A.Streletskii, A. N. Strenger, I.Struchkov, Y. T.Strunkina, L. I. Stucky, G.D. Stumpf, R. Sturmann, M. Sugihara, T. Suh, S. Suib, S.L.Sukhovei, K. S.Summerville, R. H. Sun, J. Suzuki, N. Swain, A. C.Swanson, D. R. Taber, D. F. Tabet, J. C. Tachimori, S. Tahara, M.Tainturier, G. Takagi, K. Takahashi, T. Takaishi, K. Tamura, H. Tanaka, H. Tangen, L. Tanigaki, K. Tanner, P. S.Tarafder, M. T. H. Taylor, G. C. Taylor, N. J. Taylor, P. C. Terpstra, A. Terreros, P. Teuben, J. H. Thewalt, U. Thiele, K. H. Thomas, D. Thomas, E. J.Thompson, D. W.Thompson, L. S.Thorman, J. L.Thornton-Pett, M.ThorntonPett, M. Tian, S. Tikkanen, W. Tillack, A. Tilley, T. D.Tinkham, M. L. Tio, F. E.Tiripicchio, A. Tislerova, I.Tomaszewski, R. Toraman, G. Toupet, L. Tour, J. M.Trakarnpruk, W. Traverso, O.Treschanke, L.Triller, M. U.Tripathi, U. N. Tripepi, G. Tritto, I. Trobajo, C. Troll, C.Troyanov, S. I.Trubitsin, V. Y.Trzeciak, A. M. Tsai, F. Y.Tsirelnikov, V. I. Tsubaki, S.Tsvetkova, V. I.Tsyrelnikov, V. I.Tudoret, M. J. Tunge, J. A. Turculet, L. Turner, P. Twyman, J. M. Ueyama, N. Umakoshi, Y. Unger, G. Uozumi, T. Ura, Y.Urazovskii, I. F.Urazowski, I. F. Ushioda, T. Uson, I.Valente, L. F.van den Hende, J. R.van der Linden, A. J.van der Zeijden, A. A.van der Zeijden, A. A. H.van der Zeijden, A.A.H.Vanbeek, J. A. M.Vanbolhuis, F.vanderZeijden, A. A. H.Vanhorn, D. E.Vanlenthe, J. H. Varga, V. Varret, F. Vathauer, M. Vedel, J.Veksler, E. N. Vernooijs, P. 7. tDoerrer, L. H. Doherty, S. Dohler, T. Dohmeier, C. Donnadieu, B.dos Santos, J. H. Z. Dovesi, S. Drake, R. J. Dreier, T.Drewitt, M. J.Drummond, F. O. JrDrummond, F. O., Jr,Drummond, F. O., Jr. Dubner, F.Dubnikova, I. L. Duchateau, R. Dufaud, V. Duff, A. W. Duggan, D. M.Duisenberg, A.Duncalf, D. J. Dunlap, M. S.Durand-Niconoff, J. S. Dusausoy, Y. Duval, P. B. Dzuba, V. A.DAE.F.Murphy, R. Murugavel H. W. Roesky M. Noltemeyer H. G. SchmidtXRE.F.Murphy, T. Lubben A. Herzog H. W. Roesky A. Demsar M. Noltemeyer H. G. Schmidt Eaborn, C. Eadie, R. L. Ecker, A. Eckert, J. Edamoto, K.Edelmann, F. T.Edwards, P. G. Efimov, M. E. Egan, J. W.Eilertsen, J. L. Eisch, J. J. Eisen, M. S. Ekholm, P. Elian, M. Elizarov, A. Ellis, J. E.Elsegood, M. R. J.Elsevier, C. J. Elsner, F. H. Engel, K. Engeland, T.Engeler, M. P.Engelhardt, L. M.Engelhardt, L.M. Englert, U. Erker, G. Erkoc, S. Ernst, R. D.Errington, R. J. Espina, A. Etienne, M. Evans, J. Evans, W. J. Ewart, S. W. Fahey, D. R. Fally, F. Fan, Z. Q. Fandos, R.Fanwick, P. E. Faure, J. L. Feifel, T. Feil, F. Feng, L. X. Feng, S. H. Feng, X. J. Feng, Z. F. Fermin, M. C.Fernandez, F. J.Fernandez-Baeza, J. Fiddy, S. Fink, G. Finn, M. G. Finocchio, E. Fiori, C. Fischer, R.Flambaum, V. V. Flores, J. C. Flores, M. A. Floriani, C. Fochi, G. Formstone, C. Forte, M. C. Fortunato, E. Fottinger, K.Foulkes, M. A. Fowles, G.A. Fragala, I.Fragala, I. L.Frankland, A. D. Frede, M.Freeman, W. P. Frenzel, C.Frerichs, S. R. Friedrich, M. Friedrich, S. Frohlich, R.Fronczek, F. R. Fryzuk, M. D. Fryzuk, M.D. Fuertes, A. Fujita, T. Fukui, Y. Furin, G. G. Fusco, O.\YG.Erker, C. Sarter M. Albrecht S. Dehnicke C. Kruger E. Raabe R. Schlund R. Benn A. Rufin,&G.Erker, C. Sarter S. Werner C. Kruger\YG.Erker, J. Schamberger A. A. H. van der Zeijden S. Dehnicke C. Kruger R. Goddard M. NoltD?G.Hidalgo, M. A. Pellinghelli P. Royo R. Serrano A. Tiripicchio Gabe, E. Gade, L. H. Galakhov, M.Galakhov, M. V.Galas, A. M. R.Galimberti, M.Galland, G. B.Gallucci, J. C.Galsworthy, J. R.Gambarotta, S. Ganin, V. V. Gao, X. L. Garcia, J. R.Gardiner, I. M. Gautheron, B. Gebhardt, P. Gell, K. I. Gelmini, L. Gentil, S.Gerasimova, S. O. Gervais, D. Giannini, L. Gibson, V. C.Giesbrecht, G. R.Gillespie, K. M. Gillis, D. J. Giordano, L.Girolami, G. S.Glassman, T. E. Gleiter, R. Gobley, O. Goddard, R. Gomes, P. T. Gomez, F. J. Gomez, R. Gomez-Sal, P. GomezSal, P. Gonzalez, A.Goodman, J. T. Gorls, H. Graf, D. D. Greci, M. A. Green, J. C.Green, M. L. H. Greene, D. L. Greene, D.L.Gribakin, G. F. Griebenow, Y. Grimes, R. N.Grimmer, N. E. Guarini, A. Guastini, C.| fJezequel, M. Dufaud, V. Ruiz-Garcia, M. J. Carrillo-Hermosilla, F. Neugebauer, U. Niccolai, G. P. Lefebvre, F. Bayard, F. Corker, J. Fiddy, S. Evans, J. Broyer, J. P. Malinge, J. Basset, J. M. Supported metallocene catalysts by surface organometallic chemistry. Synthesis, characterization, and reactivity in ethylene polymerization of oxide-supported mono- and biscyclopentadienyl zirconium alkyl complexes: Establishment of structure/reactivity relationships,.(Journal of958-959V"Jayaratne, K. C. Sita, L. R.D>Stereospecific living Ziegler-Natta polymerization of 1-hexene.(Journal of the American Chemical SocietyALPHA-OLEFINS; METALLOCENE CATALYSTS; MOLECULAR-WEIGHT; TITANIUM; ZIRCONIUM; POLYMERS; LIGAND; MICROSTRUCTURE; POLYOLEFINS; DERIVATIVES J. Am. Chem. Soc.p 2000 122 5HFEB 9 J AMER CHEM SOC ISI:000085294700029T 3520-3540lJezequel, M. Dufaud, V. Ruiz-Garcia, M. J. Carrillo-Hermosilla, F. Neugebauer, U. Niccolai, G. P. Lefebvre, F. Bayard, F. Corker, J. Fiddy, S. Evans, J. Broyer, J. P. Malinge, J. Basset, J. M. Supported metallocene catalysts by surface organometallic chemistry. Synthesis, characterization, and reactivity in ethylene polymerization of oxide-supported mono- and biscyclopentadienyl zirconium alkyl complexes: Establishment of structure/reactivity relationships,.(Journal of the American Chemical SocietySIO2-SUPPORTED ZIRCONOCENE CATALYSTS; ZIEGLER-NATTA CATALYSTS; GROUP-IV METALLOCENE; OLEFIN POLYMERIZATION; PROPYLENE POLYMERIZATIONS; MOLECULAR-STRUCTURE; ELASTOMERIC POLY(PROPYLENE); PENTAMETHYLENE SPACERS; ALKENE POLYMERIZATION; ARENE COMPLEXESThe reactions of Cp*Zr(CH3)(3), 1, and Cp2Zr(CH3)(2), 2, with partially dehydroxylated silica, silica-alumina, and alumina surfaces have been carried out with careful identification of the resulting surface organometallic complexes in order to probe the relationship between catalyst structure and polymerization activity. The characterization of the supported complexes has been achieved in most cases by in situ infrared spectroscopy, surface microanalysis, qualitative and quantitative analysis of evolved gases during surface reactions with labeled surface, solid state H-1 and C-13 NMR using C-13- enriched compounds, and EXAFS. 1 and 2 react with silica(500) and silica-alumina(500) by simple protonolysis of one Zr-Me bond by surface silanols with formation of a single well- defined neutral compound. In the case of silica-alumina, a fraction of the supported complexes exhibits some interactions with electronically unsaturated surface aluminum sites. 1 and 2 also react with the hydroxyl groups of gamma -alumina(500), leading to several surface structures. Correlation between EXAFS and 13C NMR data suggests, in short, two main surface structures having different environments for the methyl group: [Al](3)-OZrCp*(CH3)(2) and [Al](2)-OZrCp*(CH3)(mu -CH3)-[Al] for the monoCp series and [Al](2)-OZrCp2(CH3) and [Al]- OZrCp2(mu -CH3)-[Al] for the bisCp series. Ethylene polymerization has been carried out with all the supported complexes under various reaction conditions. Silica-supported catalysts in the absence of any cocatalyst exhibited no activity whatsoever for ethylene polymerization. When the oxide contained Lewis acidic sites, the resulting surface species were active. The activity, although improved by the presence of additional cocatalysts, remained very low by comparison with that of the homogeneous metallocene systems. This trend has been interpreted on the basis of various possible parameters, including the (p-pi)-(d-pi) back-donation of surface oxygen atoms to the zirconium center.J. Am. Chem. Soc. 2001 12315APR 18 J AM CHEM SOCISI:000168259500015111-129HBJomard, G. Petit, T. Magaud, L. Pasturel, A. Kresse, G. Hafner, J.81Oxygen adsorption on Zr(0001): An ab initio studyMolecular Simulation Mol. Simul.e 200024 1-3 MOL SIMULATISI:000089409100009*RON-SPIN-RESONANCEYZܐiY PolyhedronZݐiY0ݐ`kYPW]ݐp$X-RAY STRUCTUREESONANCEYZܐiY 10457-10468 F@Freeman, W. P. Tilley, T. D. LiableSands, L. M. Rheingold, A. L.Synthesis and study of cyclic pi-systems containing silicon and germanium. The question of aromaticity in cyclopentadienyl analogues.(Journal of the American Chemical SocietyRAY CRYSTAL-STRUCTURE; SILACYCLOPENTADIENYL ANION; ORGANOSILICON COMPOUNDS; METALLACYCLE TRANSFER; GROUP-14 METALLOLES; SILABENZENE; CHEMISTRY; ZIRCONIUM; TRANSMETALATION; HETEROCYCLESleSynthetic routes to the metallole species C(4)Me(4)E(H)R (9, E = Si, R = Si(SiMe(3))(3); 10, E = Si, R = Mes (mesityl); 11, E = Ge, R = Si(SiMe(3))(3); 12, E = Ge, R = Mes), C(4)R(4)E(SiMe(3))(2) (13, E = Si, R = Me; 14, E = Ge, R = Me; 19, E = Si, R = Et; 20, E = Ge, R = Et), and C(4)Me(4)E(R)E(R)Me(4)C(4) (15, E = Si, R = SiMe(3); 16, E = Si, R = Me; 17, E = Ge, R = SiMe(3); 18, E = Ge, R = Me) are described. In the presence of 18-crown-6, dihalides 1 and 2 are reduced by potassium in tetrahydrofuran to give crystalline samples of the silole dianion [K(18-crown-6)(+)](2)[C(4)MeSi(2- )] (21) and the germole dianion [K-4(18-crown- 6)(3)][C(4)Me(4)Ge](2) (22). Compound 21 adopts an inverse- sandwich geometry, while 22 is a dimer with a bridging [K(18- crown-6)K](2+) group and eta(5)-binding modes for all of the potassium atoms. The metallole dianions in these structures appear to possess delocalized pi-systems, as evidenced by nearly equivalent C-C bond lengths in the five-membered rings. Silolyl and germolyl anions have been obtained by various methods involving nucleophilic cleavage of bonds to germanium and silicon. Deprotonation of 11 and 12 in the presence of a crown ether gave the anions [K(18-crown-6)][C(4)Me(4)GeR] (23, R = Si(SiMe(3))(3); 24, R = Mes) and [Li(12-crown- 4)(2)][C(4)Me(4)GeR] (25, R = Si(SiMe(3))(3); 26, R = Mes). NMR parameters for these species, and X-ray structures for 25 and 26, indicate that the anionic rings possess pyramidal germanium centers and bond localization in the diene portion of the ring. Spectroscopic and X-ray crystallographic data for [Na(15-crown- 5)]-[C(4)Me(4)GeMe] (28), prepared by reductive cleavage of the Ge-Ge bond in 18, reveal a similar structure for the germolyl ring. The latter compound possesses a Na ... Ge interaction in the solid state. Silolyl and germolyl anions M[C(4)Me(4)E(SiMe(3))] (30, E = Si, M = Li; 31, E = Si, M = K; 32, E = Si, M = Li(12-crown-4)(2); 33, E = Si, M = K(18-crown- 6); 34, E = Ge, M = K; 35, E = Ge, M = K(18-crown-6)) have been prepared by nucleophilic cleavage of the E-SiMe(3) bond in C(4)Me(4)E(SiMe(3))(2) with MCH(2)Ph (M = Li, K). By similar methods, the monoanionic species [K(18-crown- 6)][C(4)Me(4)E(SiMe(3))C(4)Me(4)E] (36, E = Si; 37, E = Ge) were obtained. A crystal structure determination for 33 revealed a highly pyramidalized Si center (the angle between the C4Si plane and the Si-Si bond is 99.6 degrees) and pronounced double bond localization in the ring. Interaction between the [K(18-crown-6)](+) cation and the anion is rather weak, as indicated by the K ... Si distance (3.604(2) Angstrom) and the atomic position for K. By variable-temperature H-1 NMR spectroscopy, inversion barriers for the compounds [Li(12- crown-4)(2)][C(4)Et(4)ESiMe(3)] (38, E = Si; 40, E = Ge) and K[C(4)Et(4)SiMe(3)] (39, E = Si; 41, E = Ge) were estimated. Barriers for the germolyl anions 40 and 41 (10.5(1) and 9.4(1) kcal mol(-1), respectively) are distinctly higher than those for the corresponding silolyl anions 38 and 39, as might be expected from periodic trends. The silolyl anions exhibited coalescence temperatures below the freezing point of tetrahydrofuran (165 K), but upper limits to the inversion barriers were estimated from spectra recorded at the lowest temperatures (less than or equal to 8.3 kcal mol(-1) for 38 and <8.4 kcal mol(-1) for 39). The measured inversion barriers for compounds 38-41 provide energy differences between the pyramidal anions and their corresponding planar (possibly aromatic) structures, and their low values may be attributed to stability imparted to the transition state by delocalization of rr-electron density in the ring.J. Am. Chem. Soc. 1996 11843OCT 30 J AMER CHEM SOCISI:A1996VQ08900016mpson, L. S.LFReactions of Hydrosilanes Catalyzed by Cp2mcl2/N-Buli and Cpmcl3/Nbuli:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1992 2030&APR 5 3 ABSTR PAP AMER CHEM SOC0ISI:A1992HK16301025  1121-1130,&Corey, J. Y. Huhmann, J. L. Zhu, X. H.B8Lappert, M. F. Raston, C. L. Skelton, B. W. White, A. H.RKChemistry of Ortho-Xylidene Metal-Complexes .4. Stereospecific Synthesis of the Early Transition-Metal Meso-Metallacycles [M(Ch(Sime3)C6h4chsime3-O)(Eta-C5h5)2] (M = Ti, Zr, Hf, or Nb), Their Reversible One-Electron Reduction (M = Ti, Zr, Hf, or Nb) and Oxidation (M = Nb) - and the X-Ray Crystal-Structure of the Zirconium Complex:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19845J CHEM SOC DALTON TRANSISI:A1984SR87800022203-217. Lappert, M. F. Liu, D. S.MRecent Studies on Metal and Metalloid Bis(Trimethylsilyl) Methyls and the Transformation of the Bis(Trimethylsilyl) Methyl into the Azaallyl and Beta-Diketinimato Ligands*#Journal of Organometallic ChemistryAJ. Organomet. Chem. 1995 500E 1-2 SEP 20 J ORGANOMETAL CHEM0ISI:A1995RY95300017[ 2895-2902i>8Lappert, M. F. Raston, C. L. Skelton, B. W. White, A. H.,&Metallocene derivatives of early transition metals .5. C- centered chiral metal alkyls, [MR*(Cl)(eta-C5H5)(2)], rac- and meso-[ZrR*(2)(eta-C5H5)(2)] [R* = CH(SiMe3)C6H4Me-o], and their one-electron reductions; reaction of Li[CH(SiMe3)(2)](Me2NCH2CH2NMe2) with [MCl2(eta-C5H5)(2)] (M = Zr or Hf):3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 199717$SEP 7 J CHEM SOC DALTON TRANSISI:A1997XW83900009 Larsen, E.M. Henzler, T.E. 1974 Inorg.Chem.13 581>7Lauher, J. W. Elian, M. Summerville, R. H. Hoffmann, R. 1976Triple-Decker Sandwiches*$Journal of American Chemical Society9811 3219-3224 71-83 Lee, D. H. Noh, S. K. :3Polymerization with dinuclear metallocene compoundsaKorea Polymer JournalaX-RAY STRUCTURES; OLEFIN POLYMERIZATION; CRYSTAL-STRUCTURE; CATALYST SYSTEMS; HALF-TITANOCENES; BINUCLEAR METALLOCENES; ZIRCONIUM COMPLEXES; TITANIUM COMPLEXES; ANSA-METALLOCENES; STYRENEn The metallocene compounds had been applied to the polymerizations of olefins and vinyl monomers with methylaluminoxane (MAO) cocatalyst, and they have usually one transition metal atom per molecule, i.e., mononuclear metallocene. Recently it has been found that the dinuclear metallocene compounds containing two transition metal atoms exhibit the peculiar polymerization behaviors for olefins and vinyl monomers. In this article, the dinuclear metallocenes are classified into four groups of dinuclear bent-metallocene, dinuclear ansa-metallocene, dinuclear constrained geometry catalyst and dinuclear half-metallocene, and then the synthesis of dinuclear metallocene of each group as well as the polymerization behaviors for ethylene, propylene, and styrene are described.Korea Polym. J. 200192APR KOREA POLYMER JISI:000168511300001hey were found to be similar to those observed for standard group 4 metallocenes. The boratabenzene ligand in 7 more closely resembles an eta(5)-pentadienyl fragment than in 9, where it is eta(6)-bound. Variable-temperature H-1 NMR spectroscopy shows that ion-pair dissociation/recombination processes occur in solution. Data over large temperature ranges were obtained by the combination of line shape and spin saturation transfer techniques (100 degrees C for 4 and 5, 65 degrees C for 4). The rates of these processes give insight into how the orbital overlap between boron and the exocyclic group affects the rates of elementary reactions at the metal. The Delta H-double dagger values for ion-pair dissociation/recombination were found to increase with decreasing donor strength of the substituent: 12.2(2), 12.6(1), and 17.6(3) kcal/mol for 7, 8, and 9, respectively. Exchange reactions between 9 and 4 reveal that 7 is formed exclusively, indicating that the aminoboratabenzene ligand can better accommodate the increased positive charge on the metal center. The dependence of the carbonyl stretching frequency on the extent of metal back-bonding in complexes of the type (C5H5B- R)Cp*Zr(CO)(2) (R = NMe2 (10), OEt (11), Me (12), Ph (13)) and (C5H5B-R)(2)Zr(CO)(2) (R = NMe2 (14), OEt (15), Me (16), Ph (17)) can also be used to gauge the electron density at Zr. Complexes 10-17 were prepared by reductive carbonylation of the corresponding dichlorides. The measured reduction potentials of the dichlorides, (C5H5B-R)(2)ZrCl2, show that it is progressively more difficult to reduce the metal center as the donor strength of the boratabenzene ligand increases. The dynamic NMR, IR, and electrochemical data are consistent with the notion that the donor properties in [C5H5B-R] ligands decrease in the order R = NMe2 > OEt approximate to Me > Ph.J. Am. Chem. Soc. 2000 1227FEB 23 J AMER CHEM SOCISI:000085639200015 4785-4790ABenard, M. Rohmer, M. M.Abinitio Configuration-Interaction S2n zPph| C9-C11.'Pellecchia, C. Immirzi, A. Zambelli, A.FSingle Insertion of Propene into a Cationic Zirconium(Iv) Complex - Isolation and X-Ray Crystal-Structure of [(C5me5)Zr(Ch2chmech2ph)(Ch2ph)]-[B(Ch2ph)(C6f5)3]*#Journal of Organometallic ChemistryGJ. Organomet. Chem.1 1994 479A 1-2COCT 4 J ORGANOMETAL CHEMISI:A1994PJ11300032335-344 6/Pellecchia, C. Pappalardo, D. Vanbeek, J. A. M.Cationic Zirconium Benzyl Complexes as Catalysts for Olefin Polymerization - a Comparison among Dicyclopentadienyl, Monocyclopentadienyl and Cp-Free DerivativesMacromolecular SymposiasMacromol. Symp.. 199589JAN MACROMOL SYMPOSIAUISI:A1995QP72000030A 2505-2506 \VPellny, P. M. Kirchbauer, F. G. Burlakov, V. V. Spannenberg, A. Mach, K. Rosenthal, U.rkUnusual formation of a hex-3-ene-1,5-diyne-3-yl ligand from a buta-1,3-diyne in the Cp(*)(2)TiCl2-Mg systemzChemical Communicationst Chem. Commun.H 199924 CHEM COMMUNeISI:000083995100029m 8313-8323,`YPellny, P. M. Kirchbauer, F. G. Burlakov, V. V. Baumann, W. Spannenberg, A. Rosenthal, U.eReactivity of permethylzirconocene and permethyltitanocene toward disubstituted 1,3-butadiynes: eta 4-vs eta(2)- complexation or C-C coupling with the permethyltitanocene.(Journal of the American Chemical SocietyTRANSITION-METAL COMPLEXES; ACETYLENE COMPLEXES; CYCLIC CUMULENE; CARBON-DIOXIDE; ZIRCONOCENE; TITANOCENE; ZIRCONIUM; LIGAND; DIYNES; MACROCYCLESi(!This paper describes the reactivity of permethylzirconocene and permethyltitanocene toward different 1,3-butadiynes. A pointed dependence on the metals and the diyne substituents was found. Unusual, but still stable, five-membered zirconacyclocumulenes (eta(4)-diyne complexes, zirconacyclopenta-2,3,4-trienes) Cp*Zr-2(eta(4)-1,2,3,4-RC4R), R = Ph and SiMe3, were prepared using two new and effective synthetic routes. One starts with the permethylzirconocene bisacetylides Cp*Zr-2(C equivalent to CR)(2), R = Ph (1a), SiMe3 (1b), which rearrange in sunlight to form the stable five-membered zirconacyclocumulenes Cp*Zr- 2(eta(4)-1,2,3,4-RC4R), R = Ph (2a), SiMe3 (2b). The alternative route to 2a and 2b is the reduction of Cp*2ZrCl2 with Mg in the presence of the adequate disubstituted butadiynes RC equivalent to C-C equivalent to CR. Both methods failed to produce the analogous titanacyclocumulenes, which seemed extremely unstable. Nevertheless, we were able to obtain distinct products employing the reduction pathway with permethyltitanocene. For R = SiMe3, the novel titanacyclopropene (eta(2)-complex) Cp*Ti-2(eta(2)-1,2-Me3SiC2C equivalent to CSiMe3) (3) was isolated. For R = Ph, an activation of both pentamethylcyclopentadienyl ligands was observed resulting in the complex [eta(5)-C5Me4-(CH2)-]Ti[-C- (=CHPh)C(=CHPh)CH2-eta(5)-C5Me4] (4). The reaction of 4 with carbon dioxide led to the Cp*-substituted titanafuranone Cp*Ti[-OC(=O)C(Ph)C(-)C(=CHPh)CH2-eta(5)-C5Me4] (5). The zirconacyclocumulene 2b surprisingly inserted two molecules of CO2 to give the unprecedented cumulenic dicarboxylate Cp*Zr-2 [-OC(=O)C(SiMe3)=C=C=C(SiMe3)C(=O)O-] (6). The eta(2)-complex 3 (titanacyclopropene) took up one molecule of carbon dioxide to afford the titanafuranone Cp*Ti-2 [OC(=O)C(SiMe3)=C(C equivalent to SiMe3)-] (7).[J. Am. Chem. Soc.M 1999 121a36SEP 15 J AMER CHEM SOCISI:000082768300022o 2816-2819UpjPellny, P. M. Burlakov, V. V. Baumann, W. Spannenberg, A. Horacek, M. Stepnicka, P. Mach, K. Rosenthal, U.piFacile functionalizations of permethyltitanocene dichloride to chiral persubstituted titanocene complexesOrganometallicsCOrganometallics: 20001914JUL 10 ORGANOMETALLICSISI:000088133600027iR. Zippel,F. 1997VP(N-Isopropyl-2-(isopropylamino)troponiminato)-germanium(ii) tris(mu!2$-chloro)-b Inorg.Chem.F36 4444 RUNMIW:3van der Zeijden, A. A. H. Mattheis, C. Frohlich, R.  1997Synthesis and characterization of monocyclopentadienyl titanium and zirconium complexes bearing a chelating (chiral) ether side chain on the Cp ringOrganometallics`1612 2651-2658OrganometallicsISI:A1997XE32800029SJUN 10 ORGANOMETALLICSnd hafnium with a metal : nonmetal ratio of 2 : 182Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem. 2000 626l6[JUN Z ANORG ALLG CHEM2ISI:000087840500023697-699.:3Herrmann, W. A. Cuenca, T. Menjon, B. Herdtweck, E.xqChemistry of Oxophilic Transition-Metals .3. Dinuclear Fulvalene Complexes of Trivalent and Tetravalent Zirconium82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.s 1987267JUL ANGEW CHEM INT EDISI:A1987J644200030E 2134-2141N.(Herrmann, W. A. Menjon, B. Herdtweck, E.Chemistry of Oxophilic Transition-Metals .4. Reactivity of the Organozirconium(Iii) Complex (Mu-Eta-5-Eta-5-C10h8)[(Mu- Cl)Zr(Eta-5-C5h5)]2 with Diphenyldiazomethane, Tert-Butyl Isocyanide, and Trimethylsilyl Azide - Diazo, Cyano, and Imido ComplexesOrganometallicsOrganometallics 1991107JUL ORGANOMETALLICSISI:A1991FW22000015 d GROUPSLCU GROWING-CHAIN H ACTIVATIONR H-1 NMRru H-1-NMRESH2O-CENTER-DOT-B(C6F5)(3) HAFNIUMITHAFNIUM POLYHYDRIDES. hafnocenehalf sandwich complexesY half-sandwichHALF-SANDWICH COMPLEXESATHALF-TITANOCENESE HALIDETRY HALOGENON Hartree-Fockl heteroatomnocHETEROBIMETALLICS heterocyclesheterogeneous catalystsheterogenizationiHEXAMETHYLDISILAZANESHEXAMETHYLDISILAZIDE HEXENEOCEhighl HIGH ENANTIOMERIC PURITIESLIGhigh temperatureiHIGHER COORDINATE CYANIDE$!HIGHLY REACTIVE ORGANOLANTHANIDES HOMOGENEOUSCUhomogeneous catalysishomogeneous metallocene$!HOMOGENEOUS OLEFIN POLYMERIZATION(#homogeneous Ziegler-Natta catalysisHOMOPOLYMERIZATIONION HOMOPOLYMERST HYDRIDEE HYDRIDE COMPLEXSOHYDRIDE COMPLEXESHYDRIDE DERIVATIVESIDHYDRIDO COMPLEXES HYDROAMINATION/CYCLIZATIONHAN HYDROCARBYLSD HYDROGENNHYDROGEN ABSTRACTIONN HYDROGEN ATOMHYDROGEN-PEROXIDE HYDROLYSISEXAHYDROPEROXIDESIDA hydrosilanesoHYDROSILYLATIONILHYDROZIRCONATIOND$ HYDROZIRCONATION-TRANSMETALATIONT idenylircIMIDO COMPLEXESALIMIDO COMPOUNDSXEimpact-resistance in-sitz-supported metalloceneindanylnorbornene indenylumindenyl carbanionsarbinfrared spectroscopy INHOMOGENEOUS ELECTRON-GASESINITIO MOLECULAR-DYNAMICS INSERTIONINSERTION REACTIONSTIINTERCONVERSIONRE intramolecular cyclizationsZ ion pairsION-S ION-PAIREION-PAIR FORMATIONN-MIRON-MOLYBDENUM COFACTORISODICYCLOPENTADIENES ISOMERIZATION KAMINSKY-TYPEKAMINSKY-TYPE CATALYSTSMEKETENE COMPLEXESS KETONEACYKETONE ENOLATECTUKINETIC RESOLUTIONERS KINETICSI kinetics of polymerizationZ LANTHANIDECE  lanthanidesen leachingy Lewis acids a LEWIS-ACID-ME ligandene LIGANDSUMLINEAR ALPHA-OLEFINSNLINEAR POLYETHYLENEME LINKAGEON LITHIUM-S LITHIUM 2LITHIUM COMPLEXESLITHIUM CYCLOPENTADIENIDELITHOCENE ANIONOCliving polymerizationlong-chain branching$LOW-TEMPERATURE PHOTOCHEMISTRYLUMINESCENCE SPECTRAU M = TIING M = ZRSYN macrocycle MACROCYCLESMAGNESIUM REAGENTSRELMAGNETIC PROPERTIES main-groupdieMAIN-GROUP ELEMENTSMAOa- MECHANISMMECHANISTIC ASPECTSTSMEDIATED SYNTHESISDEH MELT RHEOLOGYMETAL METAL ALKYLNE("METAL CYCLOOCTATETRAENYL COMPLEXES$ METAL HETEROBIMETALLIC COMPLEXESMETAL KETENIMINENMETAL PHOSPHINE CHEMISTRY METAL-MPE METAL-ALKYLMETAL-CARBON BONDSTRAMETAL-COMPLEXESPLMETAL-PROMOTEDLZI METAL-PROMOTED CYCLIZATIONZ METALLACYCLECMETALLACYCLE TRANSFER metallacyclesmetallacyclocumulenes METALLACYDES METALLOCENEMETALLOCENE ANIONSUNDmetallocene catalysismetallocene catalyst.METALLOCENE CATALYSTS($metallocene catalyzed polymerizationmetallocene complexesmetallocene conformationeMETALLOCENE DERIVATIVES,'METALLOCENE METHYLALUMINOXANE CATALYSTS METALLOCENE ZIEGLER-CATALYSTmetallocene/MAO systemnY METALLOCENESCmetallocyclopropaneos METALLOLESLE METALSTIOMETALS MAGNESIUMO metathesises METATHESIS REACTIONSU METHANESS METHODIENmethyl-substitutedstMETHYLALUMINOXANE METHYLALUMINOXANE CATALYSTXES$!METHYLALUMINOXANE CATALYST SYSTEMMETHYLALUMOXANEAZMETHYLALUMOXANE CATALYSTCMETHYLENE COMPLEXESENMICROSTRUCTURENDC MIMICSOCEmixed dicyclopentadienylMNDOO MOLECULARMOLECULAR NITROGENss. molecular weight distribution MOLECULAR-YMEMOLECULAR-DYNAMICSATIMOLECULAR-STRUCTUREYMOLECULAR-STRUCTURESXMOLECULAR-WEIGHTS MOLECULAR-WEIGHT DISTRIBUTIONMOLECULAR-WEIGHT POLYMERS MOLECULES MOLYBDENUMOCEmono zirconium complexes$MONO(CYCLOPENTADIENYL)ZIRCONIUMATmonocyclopentadienylMONOMER CONCENTRATION($MONOMER-ISOMERIZATION POLYMERIZATION&P 2 @=&Jh6l5t L 4318-+81Holt, A. Engeland, T. Hjorth-Jensen, M. Osnes, E.-leApplication of realistic effective interactions to the structure of the Zr isotopes - art. no. 064318(!Physical Review C-Nuclear PhysicsPhys. Rev. C-Nucl. Phys. 2000 61066lJUN PHYS REV C-NUCL PHYSISI:0000875750000350 4185-4191)>7Horacek, M. Hiller, J. Thewalt, U. Polasek, M. Mach, K. TNActivation of the (trimethylsilyl)tetramethylcyclopentadienyl ligand in the [C5Me4(SiMe3)](2)TiCl2/Mg system, yielding intramolecular Si-CH2-Mg and Si-CH2-Ti bonds. Molecular structures of {[eta(5)-C5Me4SiMe2(mu-CH2{Mg,Mg})][eta(5)- C5Me4(SiMe3)]Ti-III(mu-H)(2)Mg(THF)}(2) and [eta(5):eta(1)- C5Me4SiMe2CH2][eta(5)-C5Me4(SiMe3)]Ti-IIIOrganometallicsOrganometallics 19971619SEP 16 ORGANOMETALLICSISI:A1997XW95100020251-251.<6Horacek, M. Kupfer, V. Muller, B. Thewalt, U. Mach, K.Reactions of (trimethylsilyl)tetramethylcyclopentadiene with (benzene)titanium(II) bis(tetrachloroaluminate). Crystal structures of [C5Me4(SiMe3)]Ti(AlCl4)(2) and {[C5Me4(SiMe3)]Ti(AlCl4)(mu-Cl)}(2) (vol 552, pg 75, 1998)*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1998 563 1-2 JUL 30 J ORGANOMETAL CHEMISI:000075121600028 75-82 <6Horacek, M. Kupfer, V. Muller, B. Thewalt, U. Mach, K.Reactions of (trimethylsilyl)tetramethylcyclopentadiene with (benzene)titanium(II) bis(tetrachloroaluminate). Crystal structures of [C5Me4(SiMe3)]Ti(AlCl4)(2) and {[C5Me4(SiMe3)]Ti(AlCl4)(mu-Cl)}(2)*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1998 552 1-2 FEB 10 J ORGANOMETAL CHEMISI:000073209500010286-292 LEHoracek, M. Kupfer, V. Thewalt, U. Stepnicka, P. Polasek, M. Mach, K. ~wBis(mu-eta(5):eta(5)-1,4- bis(trimethylsilyl)cyclooctatetraene)dititanium - the first compound with a strong Ti-Ti bondj*#Journal of Organometallic ChemistryrJ. Organomet. Chem.- 1999 584 2h JUL 23 J ORGANOMETAL CHEMISI:000082012300009R126-132 >7Horacek, M. Kupfer, V. Thewalt, U. Polasek, M. Mach, K.~Synthesis and structures of paramagnetic binuclear (eta(8)-1,4- bis(trimethylsilyl)cyclooctatetraenide)titanium(III) chlorides*#Journal of Organometallic ChemistryhJ. Organomet. Chem.t 1999 579 1-2MAY 5 J ORGANOMETAL CHEMISI:0000810428000181 10638-10639AHoracek, M. Stepnicka, P. Gyepes, R. Cisarova, I. Polasek, M. Mach, K. Pellny, P. M. Burlakov, V. V. Baumann, W. Spannenberg, A. Rosenthal, U.Novel addition reactions of 2,2,7,7-tetramethyl-3,5-octadiyne to the methyl groups of a eta(5)-pentamethylcyclopentadienyl ligandC.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.  1999 12145NOV 17 J AMER CHEM SOCISI:000083857800027e 3572-3578NLEHoracek, M. Kupfer, V. Thewalt, U. Stepnicka, P. Polasek, M. Mach, K.Bis[eta(5)-tetramethyl(trimethylsilyl) cyclopentadienyl]titanium(II) and its pi-complexes with bis(trimethylsilyl)acetylene and ethyleneOrganometallicsOrganometallics  19991818AUG 30 ORGANOMETALLICSISI:000082555300007m 2397-2408cf`Horacek, M. Stepnicka, P. Gyepes, R. Cisarova, I. Tislerova, I. Zemanek, J. Kubista, J. Mach, K.Reduction of bis[eta(5)-(omega- alkenyl)tetramethylcyclopentadienyl]titanium dichlorides: An efficient synthesis of long-chain ansa-bridged titanocene dichlorides by acidolysis of cyclopentadienyl-ring-tethered titanacyclopentanes"Chemistry-a European Journal Chem.-Eur. J. 2000613JUL 3 CHEM-EUR JISI:000088278300012 2621-2624B"Hoskin, A. J. Stephan, D. W.PIReactivity of decamethylzirconocene trihydride anion with protic reagents-OrganometallicsZOrganometallics 20001913JUN 26 ORGANOMETALLICSISI:000087804200035 3158-31672,&Hou, Z. M. Breen, T. L. Stephan, D. W.Formation and Reactivity of the Early Metal Phosphides and Phosphinidenes Cp-Asterisk-2zr=Pr, Cp-Asterisk-2zr(Pr)2, and Cp-Asterisk-2zr(Pr)3OrganometallicsOrganometallics 1993128AUG ORGANOMETALLICSISI:A1993LU68300044213-220.@9Howie, R. A. McQuillan, G. P. Thompson, D. W. Lock, G. A.Structure and Reactivity of Substituted Di-Eta-5- Cyclopentadienyl Metal Dihalides - Crystal-Structure of Dichlorobis(Eta-5-Tert-Butylcyclopentadienyl)Zirconium(Iv)*#Journal of Organometallic ChemistryNJ. Organomet. Chem.E 1986 30332APR 8 J ORGANOMETAL CHEMISI:A1986A932000007E 51-56A.'Huang, W. J. Chang, F. C. Chu, P. P. J.apiCopolymerization of norbornene with ethylene: a high-resolution liquid NMR, DSC and solid state NMR study.("Journal of Polymer Research-TaiwanJ. Polym. Res.-Taiwanm 200071aMAR J POLYM RES-TAIWANISI:000087260900007528-INOR"Huhmann, J. L. Corey, J. Y.MRLBinuclear Ziegler-Natta Type Catalysts in the Polymerization of Hydrosilanes:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1994 2085& AUG 21 1 ABSTR PAP AMER CHEM SOCISI:A1994PA261027032 4063-4074.'Huhmann, J. L. Corey, J. Y. Rath, N. P.PJSynthesis of new silyl-bridged bis(cyclopentadienyl) ligands and complexesOrganometallicseOrganometallicsc 19961519SEP 17 ORGANOMETALLICSISI:A1996VH29300024J 17-26.<6Huhmann, J. L. Corey, J. Y. Rath, N. P. Campana, C. F.lfReaction of (POR)M(OAc)(2) (M=Zr, Hf) with (n)BuLi and solid state structure of [(TPP)Zr(mu-OH)(2)](2)*#Journal of Organometallic Chemistry J. Organomet. Chem.S 1996 513C 1-2MAY 3 J ORGANOMETAL CHEMISI:A1996UP36400003 61-72.'Huhmann, J. L. Corey, J. Y. Rath, N. P.,NGCatalytic dehydrocoupling of PhSiH3 with bimetallic Ti and Zr complexes*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1997 533 1-2 APR 15 J ORGANOMETAL CHEMISI:A1997XH52700009with (n)BuLi and solid state structure of [(TPP)Zr(mu-OH)(2)](2)*#Journal of Organometallic Chemistry J. Organomet. Chem.S 1996 513C 1-2MAY 3 J ORGANOMETAL CHEMISI:A1996UP36400003 61-72.'Huhmann, J. L. Corey, J. Y. Rath, N. P.,NGCatalytic dehydrocoupling of PhSiH3 with bimetallic Ti and Zr complexes*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1997 533 1-2 APR 15 J ORGANOMETAL CHEMISI:A1997XH52700009gP6DL A. Cheng, X. Stoebenau, E. J. Slebodnick, C. Billodeaux, D. R. Fronczek, F. R.BInfluence of the departing group on the electrophilic cleavage of silicon-carbon bonds adjacent to zirconocene dichlor 1758-1759a*$Choukroun, R. Gervais, D. Raoult, Y.nhZirconium(Iii) Chemistry - Influence of Olefins in Thermolytic Behavior of (Cp27rhcl)N, (Cp2zrhch2pph2)N Polyhedron Polyhedron 19898C 13-14h POLYHEDRONISI:A1989AF80400035r374-376MTMChoukroun, R. Dahan, F. Larsonneur, A. M. Samuel, E. Petersen, J. Meunier, P.lSynthesis, X-Ray Structure, and Electrochemical Study of [(Eta- 5-C5h4c(Ch3)3)2zrh(Mu-H)]2 - Identification of the [(Eta-5- C5h4c(Ch3)3)]2zrh2 Anion Radical by Epr SpectroscopyOrganometallicsOrganometallics 1991102RFEB ORGANOMETALLICSISI:A1991EY68100003E 1511-1512RD>Choukroun, R. Zhao, J. S. Lorber, C. Cassoux, P. Donnadieu, B.piLi[Cp2Zr(C CPh)(eta(2): 1,2-PhC2C CPh)]: an anionic zirconium(II) intermediate for carbon-carbon couplingcChemical Communicationsm Chem. Commun. 200016 CHEM COMMUN ISI:0000885159000284C81-C83V81Churakov, A. V. Lemenovskii, D. A. Kuzmina, L. G.Synthesis of Sandwich and Half-Sandwich Complexes of Ti, Zr and Hf Containing Eta(5)-C(5)H(4)Sime(2)Cl Ligand - Molecular- Structure of [Ticl2(Mu-Osime(2)-Eta(5)-C5h4)](2)R*#Journal of Organometallic ChemistryJ. Organomet. Chem.1 1995 489: 1-29MAR 8 J ORGANOMETAL CHEMISI:A1995QJ12800055287-296aVPCiruelo, G. Cuenca, T. Gomez, R. Gomez-Sal, P. Martin, A. Rodriguez, G. Royo, P.Synthesis and reactivity of new silyl substituted monocyclopentadienyl zirconium complexes. X-ray molecular structure of [Zr{eta(5)-C5H4(SiMe2CH2Ph)}(CH2Ph)(3)]*#Journal of Organometallic ChemistryeJ. Organomet. Chem.g 1997 547a2tDEC 1 J ORGANOMETAL CHEMISI:0000714508000102!@BZj rF\VMurphy, E.F. Lubben,T. Herzog,A. Roesky,H. W. Demsar,A. Noltemeyer,M. Schmidt,H. G. 1996hexakis(mu!2$-Fluoro)-bis(mu!2$-chloro)-tetrakis(chloro-(eta$5!-pentamethyl-cycl octakis(mu!2$-Fluoro)-tetrakis(bromo-(eta$5!-pentamethyl-cyclopentadienyl)-zirco( Inorg.Chem.t3523 ZOPRIF ZOYCOP`ZMurphy,E.F. Lubben,T. Herzog,A. Roesky, H. W. Demsar, A. Noltemeyer, M. Schmidt, H. G. 1996VPoctakis(mu!2$-Fluoro)-tetrakis(bromo-(eta$5!-pentamethyl-cyclopentadienyl)-zirco Inorg.Chem. 3523 ZOYCOP155-162.$Naga, N. Shiono, T. Ikeda, T.e\VProfiles of ethylene polymerization with zirconocene- trialkylaluminum/borane compound0)Journal of Molecular Catalysis a-Chemicalr("ethylene polymerization; zirconocene catalyst; trialkylaluminum; cation-forming reagent ACTIVATED METALLOCENE CATALYSTS; ZIEGLER-NATTA CATALYSTS; OLEFIN POLYMERIZATION; PROPENE POLYMERIZATION; METHYLALUMINOXANE CATALYST; PROPYLENE POLYMERIZATION; EQUILIBRIA; DICHLORIDE; COMPLEXES; CP2ZRCL2Ethylene polymerization was conducted with bis(cyclopentadienyl)zirconium dichloride (1) and rac- dimethylsilylenebis(indenyl)zirconium dichloride (2) combined with trialkylaluminum (AlR3; R = methyl (Me), ethyl (Et), isobutyl (iBu))/triphenylcarbenium tetrakis(pentafluorophenyl)borate (Ph3CB(C6F5)(4)) or tris(pentafluorophenyl)borane (B(C6F5)(3)) to study the effect of cocatalysts on polymerization rate (R-p). When AlMe3 was used, no activity or very low activity was observed with both zirconocenes regardless of the borane compounds used. The replacement of AlMe3 to AIEt(3) or AliBu(3) with 1- AlR3/Ph3CB(C6F5)(4) caused polymerization and induction time was observed to reach the maximum R-p. Especially in the case of using AlEt3, it took about 30 min to show the activity. When B(C6F5)(3) was used, AlEt3 was not effective but AliBu(3) gave the highest activity among all the combinations of AlR3 and the borane compounds. In the case of polymerization with 2 using Ph3CB(C6F5)(4), high activity was observed with both AlEt3 and AliBu(3) without any induction period. When B(C6F5)(3) was used instead of Ph3CB(C6F5)(4) very low activity was observed with AlEt3. On the other hand, high activity was observed with AliBu(3), and the maximum R-p was found at the beginning of the polymerization. The effect of AlR3 on the formation of active species was discussed based on these results. (C) 1999 Elsevier Science B.V. All rights reserved.cJ. Mol. Catal. A-Chem. 1999 150r 1-2( DEC 28 J MOL CATAL A-CHEMnISI:000084327300016- 2498-2503aLFNakayama, Y. Watanabe, K. Ueyama, N. Nakamura, A. Harada, A. Okuda, J.Titanium complexes having chelating diaryloxo ligands bridged by tellurium and their catalytic behavior in the polymerization of ethyleneeOrganometallicscOrganometallics. 20001913JUN 26 ORGANOMETALLICSISI:0000878042000189BB^[_O(  xmja}%^$r&"2/%)0?-1: ?I/_Z!OGAFH8<Z65&= . |>45273sE6`KTY~JInWX?,y}3'w/10,`vo A@s7g%8[!YrZB!ydj%& *p2CVfqH b~De9D.:&>RP   ihE7t <747kmau ](T[fa#{g`Mi9 9!z Ee>@=mS9c}86  #54B 9wYy^W}m@W@ %aPRYjS=H`BWx0 "Z`X38^D_oWG3`~golhkFtnjpPH3jf4J 9186-9194pjDaturi, M. Finocchio, E. Binet, C. Lavalley, J. C. Fally, F. Perrichon, V. Vidal, H. Hickey, N. Kaspar, J.<5Reduction of high surface area CeO2-ZrO2 mixed oxidesF&Journal of Physical Chemistry BiJ. Phys. Chem. B 2000 10439OCT 5 J PHYS CHEM BMISI:000089712900018: 5404-5409C^WDeck, P. A. Cheng, X. Stoebenau, E. J. Slebodnick, C. Billodeaux, D. R. Fronczek, F. R.BInfluence of the departing group on the electrophilic cleavage of silicon-carbon bonds adjacent to zirconocene dichloride. Preparation of electrophile-functionalized zirconocene dibromidesOrganometallics SILYL-SUBSTITUTED CYCLOPENTADIENYL; OLEFIN POLYMERIZATION CATALYSTS; ZIEGLER-NATTA CATALYSTS; PROPYLENE POLYMERIZATION; METALLOCENE CATALYSTS; COMPLEXES; ARYLSILANES; REACTIVITY; BORYLATION; ZIRCONIUMxq(EtMe2SiC5H4)CpZrCl2 (5) reacts with BBr3 in 1,2-dichloroethane (reflux, 24 h) to afford a 4:1 mixture of (EtMeBrSiC5H4)CpZrBr2 (10) and (BrMe2SiC5H4)CpZrBr2 (11) in a nearly quantitative conversion. Similarly, ((BuMe2SiC5H4)-Bu-t)CpZrCl2 (6) reacts with BBr3 to afford a 15:1 mixture of ((BuMeBrSiC5H4)-Bu- t)CpZrBr2 (13) and 11. The product 11 is obtained independently by treating (Me3SiC5H4)CpZrCl2 (12) with BBr3. In contrast, Si- Ph bonds are cleaved with complete selectivity in the presence of Si-Me groups. (PhMe2SiC5H4)(2)-ZrCl2 (8) reacts with excess BCl3 in dichloromethane (reflux, 15 h) to afford (ClMe2SiC5H4)(2)-ZrCl2 (14) in 72% yield. (Ph2MeSiC5H4)(2)ZrCl2 (9) reacts with excess BBr3 in 1,2-dichloroethane (reflux, 15 h) to afford (Br2MeSiC5H4)(2)ZrBr2 (15) in 79% yield. Complexes 9 and 15 were analyzed by single-crystal X-ray diffraction. Crystalline 9 adopts a pseudo-C-2 conformation in which the face of the Ph group of one ligand shows a weak interaction with a C-H bond of the other ligand. Crystalline 15 also adopts a pseudo-C-2 conformation, in which the SiBr2 groups are directed away from the ZrBr2 group.eOrganometallicst 20001925DEC 11 ORGANOMETALLICSISI:000165704600021l929-932mD>Deckers, P. J. W. van der Linden, A. J. Meetsma, A. Hessen, B.RKCationic ansa-(eta(5)-cyclopentadienyl)(eta(6)-arene) complexes of titanium.'European Journal of Inorganic ChemistryCEur. J. Inorg. Chem. 200055MAY EUR J INORG CHEMISI:000087022200018E281-285.LFDeelman, B. J. Hitchcock, P. B. Lappert, M. F. Lee, H. K. Leung, W. P.piNovel monoanionic di-N,N'-centred chelating ligands and their C-1 and C-2 symmetrical zirconium complexest*#Journal of Organometallic Chemistry2J. Organomet. Chem.t 1996 513h 1-2nMAY 3 J ORGANOMETAL CHEMISI:A1996UP36400031) 1444-1452eZTDeelman, B. J. Hitchcock, P. B. Lappert, M. F. Leung, W. P. Lee, H. K. Mak, T. C. W.Novel zirconium and hafnium complexes of monoanionic Di-N,N '- chelating pyridyl- and quinolyl-1-azaallyl ligands and their activity in olefin polymerization catalysislOrganometallics Organometallics  1999188eAPR 12 ORGANOMETALLICSISI:000079947500013e 2794-2805J`ZDekock, R. L. Peterson, M. A. Reynolds, L. E. L. Chen, L. H. Baerends, E. J. Vernooijs, P.~wTheoretical-Study of the Nature of the Bonding in [Cp2m(Mu- X)]2, Where M = Zr (X = I, Ph2, and Nh) and M = Ti (X = Cl)9OrganometallicsOrganometallics  1993127.JUL ORGANOMETALLICSISI:A1993LU68200055 1187-11906piDella Bona, M. A. Cassani, M. C. Keates, J. M. Lawless, G. A. Lappert, M. F. Sturmann, M. Weidenbruch, M.Magnetic resonance spectroscopic studies of a tetraaryl- distannene and -digermene [M2R4] (R = C6HBut-2-Me-3-4,5,6 and M = Sn or Ge):3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19987$APR 7 J CHEM SOC DALTON TRANSISI:000073170600021 3567-3573nD>Della Sala, G. Giordano, L. Lattanzi, A. Proto, A. Scettri, A.NHMetallocene-catalyzed diastereoselective epoxidation of allylic alcohols Tetrahedroni diastereoselection; epoxidation; titanium and compounds; zirconium and compounds TERT-BUTYL HYDROPEROXIDE; ASYMMETRIC EPOXIDATION; UNFUNCTIONALIZED ALKENES; SELECTIVE EPOXIDATION; ALKYL HYDROPEROXIDES; HYDROGEN-PEROXIDE; OLEFINS; MECHANISM; COMPLEXES; OXIDATION0)Allylic alcohols undergo an efficient process of diastereoselective epoxidation by t-butyl hydroperoxide (TBHP) in n-hexane solution in the presence of catalytic amounts of mono- and bis-cyclopentadienyl titanium(IV) and zirconium(IV) chlorides. (C) 2000 Elsevier Science Ltd. All rights reserved. Tetrahedron 20005622MAY 26 TETRAHEDRONISI:000087253000012.(Demerseman, B., Bouquet, G., Bigorne, M. 1976J. Organometal. Chem 107 C19synthesis of zrcp2co20)Demerseman, B., Bouquet, G., Bigorne, M. 1977J. Organometal. Chem 132 223s C1-C4A2,Diamond, G. M. Green, M. L. H. Walker, N. M.Convenient One-Pot Synthesis of 1/2-Sandwich Eta- Cycloheptatrienyl and Eta-Toluene Derivatives of the Metals Titanium and Zirconium - Crystal-Structure of [Zr(Eta-6- C6h5me)(Pme3)2cl2]*#Journal of Organometallic ChemistryiJ. Organomet. Chem.c 1991 413n 1-3AUG 7 J ORGANOMETAL CHEMISI:A1991GB68100038  2641-2646PJDiamond, G. M. Green, M. L. H. Walker, N. M. Howard, J. A. K. Mason, S. A.82Diene and Arene Compounds of Zirconium and Hafnium:3Journal of the Chemical Society-Dalton Transactionsa"J. Chem. Soc.-Dalton Trans.T 199217$SEP 7 J CHEM SOC DALTON TRANS9ISI:A1992JM27900016H 2259-2261@:Diamond, G. M. Green, M. L. H. Mountford, P. Walker, N. M.jdHalf-Sandwich Eta-Cycloheptatri-Ene and Eta-Cycloheptatri-Enyl Derivatives of Titanium and Zirconium:3Journal of the Chemical Society-Dalton TransactionsT"J. Chem. Soc.-Dalton Trans.H 199214$JUL 21 J CHEM SOC DALTON TRANSISI:A1992JG569000179417-422TRKDiamond, G. M. Green, M. L. H. Mountford, P. Walker, N. M. Howard, J. A. K.voSynthesis and Reactions of Eta-Cycloheptatriene and Eta- Cycloheptatrienyl Derivatives of Zirconium and HafniumC:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19923 "FEB J CHEM SOC DALTON TRANSISI:A1992HD31900011 2535-2536B7Journal of the Chemical Society-Chemical Communicationsc"J. Chem. Soc.-Chem. Commun.2 19946C$MAR 21 J CHEM SOC CHEM COMMUN2ISI:A1994ND76700026jR. 2526-2531..(Liang, L. C. Schrock, R. R. Davis, W. M.rkSynthesis of titanium, zirconium, and hafnium complexes that contain the [(mesitylN-o-C6H4)(2)O](2-) ligandOrganometallicsOrganometallics 20001913JUN 26 ORGANOMETALLICSISI:000087804200021273-283 *$Licht, E. H. Alt, H. G. Karim, M. M.xqMixed substituted zirconocene dichloride complexes as catalyst precursors for homogeneous ethylene polymerization0)Journal of Molecular Catalysis a-ChemicallJ. Mol. Catal. A-Chem. 2000 15902OCT 2 J MOL CATAL A-CHEMISI:000089431200013L 9-23*$Licht, E. H. Alt, H. G. Karim, M. M.Synthesis and characterization of bis(cyclopentadienyl)zirconium dichloride complexes with omega- fluorenylalkyl or silyl substituents and their application in catalytic ethylene polymerization0)Journal of Molecular Catalysis a-Chemical  zirconium; catalysis; ethylene polymerization; metallocene complexes; substituents M = ZR; OLEFIN POLYMERIZATION; SYNDIOTACTIC POLYPROPYLENE; METALLOCENE CATALYSTS; ZIRCONOCENE COMPLEXES; CYCLOPENTADIENYL RING; CRYSTAL-STRUCTURES; PROPYLENE; ZIRCONIUM; BEHAVIORnEight zirconocene dichloride complexes are described that contain an alkyl or silylalkyl substituent with a fluorenyl end group on the cyclopentadienyl ring. Also, a bridged cyclopentadienyl indenyl metallocene complex with a fluorenyl terminated alkyl substituent is reported. These complexes were activated with methyl aluminoxane (MAO) and used for catalytic ethylene polymerization. (C) 2000 Elsevier Science B.V. All rights reserved.J. Mol. Catal. A-Chem. 2000 164 1-2 DEC 18 J MOL CATAL A-CHEMISI:000166078400002X+Z*zzqt2 D. W.HBStructure and Magnetic-Properties of [Cp2m(Mu-Pet2)]2 (M = Ti, Zr)>8Canadian Journal of Chemistry-Revue Canadienne De ChimieTITANIUM PHOSPHIDES; STRUCTURES; MAGNETIC PROPERTIES METAL HETEROBIMETALLIC COMPLEXES; MOLECULAR-STRUCTURE; COOPERATIVE ACTIVATION; CRYSTAL; REACTIVITY; TITANIUM; ELECTROCHEMISTRY; DERIVATIVES; TITANOCENE; ZIRCONIUMmPJThe complex [Cp2Ti(mu-PEt2)]2 (1) crystallizes in the monoclinic space group P2(1)/n 3220-3227JDFlores, M. A. Manzoni, M. R. Baumann, R. Davis, W. M. Schrock, R. R.ZTZirconium complexes that contain a diamido O-donor ligand with a restricted geometryOrganometallicsoOrganometallicso 19991816AUG 2 ORGANOMETALLICS ISI:000081997400041e 2245-2248dF?Floriani, C. Solari, E. Solari, G. Chiesi-Villa, A. Rizzoli, C.uThe pi-pyrrole complexation of alkali metal ions by zirconium meso-octaalkylporphyrino-gens: Encapsulation of Li4H4 and Li2O in sandwich structure.'Angewandte Chemie-International EditioniAngew. Chem.-Int. Edit.t 19983716AUG 17 ANGEW CHEM INT EDISI:0000758605000200 19-23. Floriani, C.ztMetal reactivity on oxo surfaces modeled by calix[4]arenes: Metal-driven reactions in an oxo-quasiplanar environment"Chemistry-a European Journal Chem.-Eur. J.O 199951gJAN CHEM-EUR JISI:000078024200001 1253-1256& Fochi, G. Guidi, G. Floriani, C."Bis(Cyclopentadienyl)Zirconium(Iii) Complexes Containing a Metal Metal Bond - Synthesis and Properties of Zirconium(Ii) and Zirconium(Iii) Complexes:3Journal of the Chemical Society-Dalton Transactions8"J. Chem. Soc.-Dalton Trans. 19846 J CHEM SOC DALTON TRANS4ISI:A1984SW13100039I*$Fowles, G.A. Russ, B.J. Willey, G.R. 1967:4Journal of Chemical Society, Chemical Communications 646C Fowles, G.A. Willey, G.R.\ 1968$Journal of Chemical Society, A 1435 2435-2436F?Frankland, A. D. Hitchcock, P. B. Lappert, M. F. Lawless, G. A.BA Novel High-Yield Route to Organic Derivatives of Group-2 Metals X-Ray Structure of [(Ba(Otf)(2))(4)(Py)(14)]Center-Dot- Py (Otf=Oso2cf3) and Nmr Spectral Characterization of [Ba(Nr(2))(Mu-Nr(2))(2)Na(Thf)(2)] (R=Sime(3))>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 199421"NOV 7 J CHEM SOC CHEM COMMUNISI:A1994PQ838000072000 28118SEP J NUCL MATERISI:0000893218000060 1494-1499n,&Kasani, A. Gambarotta, S. Bensimon, C.Zirconium alkyl and borohydride complexes stabilized by a sterically demanding anionic organic amide. The crystal structures of ZrMeL3 (2) and Zr(BH4)L-3 (3) (L = (3,5- Me2Ph)N(Ad); Ad equals adamantyl)>8Canadian Journal of Chemistry-Revue Canadienne De Chimie$Can. J. Chem.-Rev. Can. Chim. 19977511NOV CAN J CHEMISI:000071518100008.hD9eD^~"b8 Z229-236.NGPolo, E. Galimberti, M. Mascellani, N. Fusco, O. Muller, G. Sostero, S.AZSEthene/propene copolymerisations with rac-EBTHIZrR2/alumoxane: sigma-ligands effect0)Journal of Molecular Catalysis a-ChemicalbJ. Mol. Catal. A-Chem. 2000 160a2a OCT 31 J MOL CATAL A-CHEMyISI:000089829700004s759-765 @9Popowski, Y. Hiltbrand, E. Joliat, D. Ing, D. Rouzaud, M.|Open magnetic resonance imaging using titanium-zirconium needles: Improved accuracy for interstitial brachytherapy implants?B;International Journal of Radiation Oncology Biology Physics0("Int. J. Radiat. Oncol. Biol. Phys. 2000473:("JUN 1 INT J RADIAT ONCOL BIOL PHYSISI:000087393900030 8259-8265S0)Poumbga, C. N. Benard, M. Hylakryspin, I.^XPlanar Tetracoordinate Carbons in Dimetallic Complexes - Quantum-Chemical Investigations.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.r 1994 11618SEP 7 J AMER CHEM SOC5ISI:A1994PF91300036 779-780 >8Priego, J. L. Doerrer, L. H. Rees, L. H. Green, M. L. H.Weakly-coordinating anions stabilise the unprecedented monovalent and divalent eta-benzene nickel cations [(eta-C5H5) Ni(eta-C6H6) Ni(eta-C5H5)](2+) and [Ni(eta-C6H6)2](2+)Chemical CommunicationsRKCRYSTAL-STRUCTURES; COMPLEXES; H2O-CENTER-DOT-B(C6F5)(3); TETRAFLUOROBORATE@9Nickelocene in benzene reacts with the Bronsted acid H2O-B( C6F5)(3) to give the salt [(eta-C5H5) Ni(eta-C6H6) Ni(eta- C5H5)][ B-3(mu-O)(3)(C6F5)(5)] which is the first example of a triple-decker nickel sandwich with a bridging eta-benzene ligand; the borate anion is also unprecedented; treatment of Ni(eta-C5H5)(2) with Brookhart's acid [H(OEt2)(2)][B(3,5(CF3) 2C6H3)(4)] in benzene gives the paramagnetic bis(eta-benzene) nickel derivative {[Ni(eta-C6H6)(2)][B(3,5(CF3) 2C6H3)(4)]2 . Ni(eta-C5H5)(2)} in which nickelocene is present as a molecule of crystallisation. Chem. Commun. 20009 CHEM COMMUNISI:000086779800025 2063-2065EXRProkopenko, I. V. Efimov, M. E. Troyanov, S. I. Medvedev, V. A. Tsirelnikov, V. I.4.Enthalpies of Zirconium Monochloride Formation Zhurnal Fizicheskoi KhimiiZhurnal Fiz. Khimii 1986608AUG ZH FIZ KHIMyISI:A1986E008700055n 17-25.0*Pupi, R. M. Coalter, J. N. Petersen, J. L.Structural Studies of Monocyclopentadienyl Titanium and Zirconium Complexes Containing a Diisopropylamide Ligand - Evidence of a Beta-Agostic Interaction in (C5h5)M[N((C3h7)-C- I)(2)]Cl-2r*#Journal of Organometallic ChemistryYJ. Organomet. Chem.1 1995 497 1-2 JUL 26 J ORGANOMETAL CHEMHISI:A1995RM31800005 4489-4490WJCQuan, R. W. Bazan, G. C. Kiely, A. F. Schaefer, W. P. Bercaw, J. E.iPentamethylcyclopentadienyl Aminoborollide Derivatives of Zirconium and Hafnium - a New Class of Amphoteric Molecule Having Both Lewis Acidic and Lewis Basic Sitesa.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.: 1994 116-10MAY 18 J AMER CHEM SOCISI:A1994NM988000533 2411-2417pRLQuijada, R. Rojas, R. Bazan, G. Komon, Z. J. A. Mauler, R. S. Galland, G. B.tmSynthesis of branched polyethylene from ethylene by tandem action of iron and zirconium single site catalysts MacromoleculeshbMETALLOCENE CATALYSTS; ALPHA-OLEFINS; COPOLYMERIZATION; OLIGOMERIZATION; POLYMERIZATION; COMONOMER0*The synthesis of low-density polyethylene from ethylene as the only monomer feed has been investigated as an alternative route to branched polyethylene and to obtain new materials with different properties, avoiding the need to feed l-alkenes into l;he polymerization process. The details of the evaluation of two combination catalyst systems based on single site catalysts are discussed. The { [(2-ArN=C(Me))(2)C5H3N]FeCl2} (Ar = 2- C6H4(Et)) compound, designated as catalyst 1, oligomerizes ethylene to produce linear alpha -olefins with high selectivity, and Me(2)SiInd(2)ZrCl(2) (2) or EtInd(2)ZrCl(2) (3) are used as catalysts that incorporate the alpha -olefins in the polymer. For catalyst 1 in the presence of methylaluminoxane (MAO) and ethylene, a wide range of alpha - olefin products were found, both soluble and insoluble. Also, tandem catalyst combinations 1 and 2 or 1 and 3 in the presence of ethylene alone can readily produce branched polyethylene with levels of 1-4 branches per 100 units of ethylene. A change in activity was found for variations in the Fe/Zr ratio for both systems, with lower activity but higher frequency of branching in the polymer backbone for catalyst 2. The final product obtained by the 1/3/MAO systems, however, shows a more homogeneous structure as determined by DSC and GPC.Macromolecules 2001348hAPR 10 MACROMOLECULESlISI:000167964600007t 11-19PBYano, A. Sone, M. Yamada, S. Hasegawa, S. Sato, M. Akimoto, A.Effect of ligand structures on high temperature homo- and copolymerization of ethylene by cationic hafnocene catalysts based on tetrakis(pentafluorophenyl) borate0)Journal of Molecular Catalysis a-Chemicalhafnocene; ligand; ethylene polymerization; high temperature ZIRCONOCENE CATALYSTS; PROPYLENE POLYMERIZATIONS; METALLOCENE CATALYSTS; CRYSTAL-STRUCTURES; ALPHA-OLEFINS; PROPENE; COMPLEXES; DERIVATIVES; 1-HEXENEEthylene (Et) polymerization and Et/alpha-olefin copolymerization were carried out with various hafnocenes activated with dimethylanilinium tetrakis(pentafluorophenyl)borate (Me2PhNH . B(C6F5)(4)/triisobutylaluminum (i-Bu3Al) to study the relationship between ligand structures and catalyst performance at high temperature. Dimethylsilylene(bisindenyl)hafnium dichloride (Me2Si(Ind)(2)HfCl2)-based catalyst produced highest molecular weighs polyethylene among indenyl-based catalysts. Hydrogenation of the indenyl ligand resulted in the decrease in activity and copolymerization reactivity, presumably due to the increased mobility of the ligand framework at high temperature. Diphenylmethylidene(cyclopentadienyl)(fluorenyl)hafnium dichloride (Ph2C(Cp)(Flu)HfCl2)-based catalyst produced higher molecular weight polyethylene than zirconium analog and indenyl-based hafnocene catalysts, but the activity was drastically dependent upon the alkylaluminum compound. This phenomenon was not observed in the corresponding zirconium catalyst. A broad chemical composition distribution, which was observed in Et/1-hexene copolymers obtained with Ph2C(Cp)(Flu)HfCl2-based catalyst, was attributed to the small amount of zirconium contamination. (C) 2000 Elsevier Science B.V. All rights reserved.J. Mol. Catal. A-Chem. 2000 156n 1-2. MAY 20 J MOL CATAL A-CHEMhISI:000087526500012 73-78.("Yasuda, Y. Nakatsuka, O. Zaima, S.\VInterfacial reactions of Ti- and Zr(Si1-xGex) Si contacts with rapid thermal annealingThin Solid FilmsThin Solid Films 2000 373t 1-2 SEP 3 THIN SOLID FILMSISI:000090045900018e 8859-8860,%Yin, J. G. Abboud, K. A. Jones, W. M.NZTSynthesis of Zirconocene Complexes of a 1,2,3-Cyclohexatriene and a Cyclohexen-3-Yne.(Journal of the American Chemical SocietyxrRING CYCLIC CUMULENES; RAY CRYSTAL-STRUCTURE; METAL-COMPLEXES; ALKENE COMPLEXES; REACTIVITY; CYCLOALKYNES; ALKYNESJ. Am. Chem. Soc.M 1993 115)19SEP 22 J AMER CHEM SOCISI:A1993LZ13300057i 1271-1275rLEYoon, J. S. Lee, Y. S. Park, E. S. Lee, I. M. Park, D. K. Jung, S. O. ZTSynthesis of polypropylene using bis(2-alkylindenyl)zirconium dichloride/MAO systemsEuropean Polymer JournalANSA-METALLOCENE CATALYSTS; GROUP-IVB CATALYSTS; ELASTOMERIC POLYPROPYLENES; PROPENE POLYMERIZATION; ZIRCONOCENE CATALYSTS; MONOMER CONCENTRATION; PROPYLENE; STEREOSPECIFICITY; STEREOSELECTIVITY; METHYLALUMOXANExrElastomeric polypropylene was prepared using bis(2- alkylindenyl)zirconium dichloride(alkyl = methyl, i-propyl, n- butyl, benzyl, and cyclohexyl) as a catalyst. The nature of the alkyl substituent exerted stronger influence upon the catalytic activity for propylene polymerization rather than upon that corresponding to ethylene polymerization. The rate of propylene polymerization decreased in the following order; (2- MeInd)(2)ZrCl2 > (2-n-BuInd)(2)ZrCl2 > (2-CyInd)(2)ZrCl2 > (2- i-PrInd)(2)ZrCl2 > (2-BzInd)(2)ZrCl2. Molecular weight of PP increased as the polymerization temperature decreased. Among the five catalysts, (2-MeInd)(2)ZrCl2 produced the highest molecular weight-PP, and (2-BzInd)(2)ZrCl2 yielded PP with the lowest molecular weight. Meanwhile, PP produced over (2- BzInd)(2)ZrCl2, which contained the highest [mmmm] pentad fraction, showed lower tensile strength, tensile modulus, elongation and elastic recovery compared to those obtained by the other catalysts, presumably due to its lower molecular weight. When PP had molecular weights high enough so that the mechanical properties were in the plateau region, [mmmm] pentad fraction influenced PP from (2-n-BuInd)(2)ZrCl2 to exhibit higher tensile strength and tensile modulus but lower elongation and tensile set after elongation compared to PP from (2-MeInd)(2)ZrCl2. (C) 2000 Elsevier Science Ltd. All rights reserved.Eur. Polym. J. 20003661JUN EUR POLYM JISI:000085986000021T 4985-4987CYoshida, T. Negishi, E.SSelective Carbon-Carbon Bond Formation Via Transition-Metal Catalysis .21. Mechanism of the Zr-Catalyzed Carboalumination of Alkynes - Evidence for Direct Carboalumination.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.2 1981 10316J AMER CHEM SOC ISI:A1981MB11600072  1276-1277mYoshida, T. Negishi, E.SSelective Carbon-Carbon Bond Formation Via Transition-Metal Catalysis .17. Controlled Carbometatation .8. 1,1- Dimetalloalkenes Containing Aluminum as Well as Titanium or Zirconium - Their Structures and Use as Novel Alkenylidene and Alkenyl Transfer Agents.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1981 1035J AMER CHEM SOCISI:A1981LF69400074 Y SIMPLESTASIMPLEST METALLOCENESIMULTANEOUS SMALL-ANGLESsingle-site catalysts($SIO2-SUPPORTED ZIRCONOCENE CATALYSTS SODIUMUPSSODIUM HYDRIDE-DE SOLID-DIF SOLID-STATEUCSOLUBLE ZIEGLER-CATALYSTS SOLUTIONTSOLUTION DYNAMICS SOLVATION$SPECTROSCOPIC CHARACTERIZATIONS SPECTROSCOPYN$!SPHERE ELECTROSTATIC CALCULATIONSSTABLE PRIMARY ENAMINES PSTACKSTATESTATISTICAL-ANALYSISNSTEREOCHEMICAL CONTROLZIRSTEREOCHEMISTRYIOSTEREOERROR FORMATION,&STEREOSELECTIVE PROPENE POLYMERIZATIONSTEREOSELECTIVITYSTEREOSPECIFICITY STERICTIO STILBENENSTRAINED CYCLIC CUMULENES STRATEGIESSE STRONTIUM STRUCTURAL CHARACTERIZATIONLL STRUCTUREstructure elucidation STRUCTURESSTR STYRENETAsubstituent effectati substituentsy SUBSTITUTIONESUBSTITUTION-REACTIONSALS0*successive self-nucleation/annealing (SSA)SULFONIUM SALTSXE SUPERSANDWICH supported PHT surfaceizSYNDIOSPECIFICCHA(%SYNDIOSPECIFIC STYRENE POLYMERIZATION SYNDIOTACTICC SYNDIOTACTIC POLYPROPYLENENSYNDIOTACTIC-SPECIFICsynthesis of zrcp2co2 SYNTHONST SYSTEM6(N SYSTEMSCE TANTALUMY TEMPERATURELO TERMINATION CTERT-BUTYL HYDROPEROXIDETETRAFLUOROBORATE TETRAHYDROBORATE COMPLEXESZTETRAHYDROFURANDETETRAHYDROFURAN SOLUTIONLtetrahydroindenyl ligandTETRAHYDROINDENYL LIGANDS TETRAVALENTE TETRAVALENT ZIRCONIUMTHERMAL-PROPERTIESISN THERMOLYSISTATHF=TETRAHYDROFURANIZTHIOALDEHYDE COMPLEXESTIO THIOETHERSNATTHIOLATE COMPLEXESRE thuliumumTIECT TI N BONDINGDtinni TITANIUMSTITANIUM ALKYLIDENESATITANIUM AMIDEStitanium and compoundsTITANIUM COMPLEXESSNETITANIUM PHOSPHIDESTITANIUM(IV) COMPLEXESOCA TitanoceneTITANOCENE DERIVATIVESSNSTITANOCENE-ALKYNE titanocenessTO-TAIL DIMERIZATION TOLANESTRTORSIONAL ISOMERISMON TRANSFERYTRANSITION STRUCTURES TRANSITION- CTRANSITION-METALNTRANSITION-METAL BONDSCAT TRANSITION-METAL CATALYSIS\Zr TRANSITION-METAL COMPLEXESZ TRANSITION-METAL-COMPLEXESZTRANSITION-METALSTRANSMETALATIONNE TRAPPINGTtrialkylaluminuma TRICHLORIDEUC tridentateTRIETHYNYLBENZENETRIGGER MECHANISMTRIMETHYLALUMINUMTRIMETHYLSILYLION TRIMETHYLSILYLDIAZOMETHANE trinuclear zirconium complex TRIPLE BOND C TRIS(PENTAFLUOROPHENYL)BORANE(%TRIS(TRIMETHYLSILYL)SILYL DERIVATIVES TUNGSTENYTURNSTILE ROTATIONiYUNFUNCTIONALIZED ALKENES X = CLUREX-ectX-RAYX-RAY DIFFRACTIONX-RAY STRUCTUREX-RAY STRUCTURESc X-RAY-OLEX-RAY-DIFFRACTIONX=CLR YLIDESTRYZIEGLER CATALYSTMZiegler catalysts Ziegler-NattaZIEGLER-NATTA CATALYSISYZiegler-Natta catalystZIEGLER-NATTA CATALYSTSME ZIEGLER-NATTA POLYMERIZATIONZIRCONACYCLOPENTADIENESIOZIRCONACYCLOPENTENESO zirconiumzirconium and compoundsZIRCONIUM CATALYSTATIzirconium complexZIRCONIUM COMPLEXESTSZIRCONIUM DICHLORIDEsZIRCONIUM REAGENTSESI ZIRCONIUM(IV)($Zirconium, Zr, Zirconocene dibromideZIRCONIUM-CARBON BONDzirconium-catalyzed($ZIRCONIUM-MEDIATED FUNCTIONALIZATION ZIRCONOCENE ZIRCONOCENE ALKYNE COMPLEXZzirconocene catalystZIRCONOCENE CATALYSTSzirconocene complexesZIRCONOCENE DERIVATIVESIOzirconocene dichloride("ZIRCONOCENE THIOALDEHYDE COMPLEXESZIRCONOCENE TRIHYDRIDEPLE ZIRCONOCENE-F ZIRCONOCENE-ALKENE COMPLEXES$ZIRCONOCENE-PHOSPHIDO COMPLEXES zirconocenescZRGANZr-enzwitterionic metallocenes9dsxTHYb289-290.B;Ashworth, T. V. Agreda, T. C. Herdtweck, E. Herrmann, W. A.d]Novel Fulvalene Derivatives of Zirconium - a Facile Entry into Organozirconium(Iii) ChemistryO82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.  1986253MAR ANGEW CHEM INT ED ISI:A1986C0842000318 3259-3264zAvent, A. G. Eaborn, C. Hitchcock, P. B. Lawless, G. A. Lickiss, P. D. Mallien, M. Smith, J. D. Webb, A. D. Wrackmeyer, B.Crystal-Structure of [Li(Tmen)2][Li(C(Sime3)3)2] - a Multinuclear Magnetic-Resonance Study of Tris(Trimethylsilyl)Methyllithium Tetrahydrofuran(1/2) and - N,N,N',N'-Tetramethylethylenediamine (1/1) (Tmen):3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.M 199321$NOV 7 J CHEM SOC DALTON TRANSISI:A1993MF93800014. 1305-1307C4-Babaiankibala, E. Cotton, F. A. Kibala, P. A.S,&Structure of [Zrcl3(Ch3och2ch2och3)]2oHAActa Crystallographica Section C-Crystal Structure Communicationsu60Acta Crystallogr. Sect. C-Cryst. Struct. Commun. 199147,%JUN 15 6 ACTA CRYSTALLOGR C-CRYST STRcISI:A1991FU70400063 2424-+HABai, G. C. Roesky, H. W. Hao, H. J. Noltemeyer, M. Schmidt, H. G.Synthesis of the titanium compound [(MeC5H4)TiCl(mu-NSiMe3)](2) with migration of a SiMe3 group and preparation of Cp2ZrCl(eta(2)-NHNCHSiMe3}Inorganic ChemistryX-RAY STRUCTURE; ORGANIC-SYNTHESIS; LITHIUM TRIMETHYLSILYLDIAZOMETHANE; DIAZOALKANE COMPLEXES; ALKYLIDENE COMPLEXES; TRIPLE BOND; REACTIVITY; DIAZO; REAGENTS; SYNTHONHBReaction of(MeC5H4)TiCl3 with Me3SiCLiN2 gave the imido-bridged dinuclear titanium complex [(MeC5H4)TiCl(mu -NSiMe3)](2) (1; below left) with migration of a SiMe3 group. The reaction of Cp-2-ZrHCl with Me3SiCHN2 yielded an eta (2)-N-2-zirconium diazoalkane complex Cp2ZrCl(eta (2)-NHNCH-SiMe3) (2; below right). [GRAPHICS] Inorg. Chem. 20014010MAY 7 INORG CHEMISI:000168524100035431-433.,&Baker, R. W. Foulkes, M. A. Turner, P.Enantiospecific synthesis of a planar chiral fluorenylzirconium ansa-metallocene: synthesis and structures of [1-(9-fluorenyl)- and [1-(1-methyl-9-fluorenyl)-2-(2- indenyl)naphthalene]zirconium dichloride:3Journal of the Chemical Society-Dalton Transactions^XCYCLOPENTADIENYL LIGANDS; AXIAL CHIRALITY; DERIVATIVES; CARBANIONS; RETENTION; COMPLEXESDi-lithiation of +ac(R)-1-methyl-9-[2-(2-indenyl)-1- naphthyl]fluorene, +ac(R)-6, generates an axially chiral fluorenyl ligand, (a-S)-10, which on reaction with ZrCl4 enantiospecifically provides the planar chiral ansa-zirconocene (p-S)-[1-(1-methyl-9-fluorenyl)-2-(2- indenyl)naphthalene]zirconium dichloride, (p-S)-8; single crystal X-ray structures have been determined for the racemic ansa-zirconocene rac-8 and the related C-s-symmetric ansa- zirconocene 7."J. Chem. Soc.-Dalton Trans. 20004J CHEM SOC DALTON TRANSISI:000085350300001 2207-2216.<6Bandy, J. A. Green, M. L. H. Gardiner, I. M. Prout, K.Polymerization of Ethylene and Propene Using New Chiral Zirconium Derivatives - Crystal-Structure of [Zrl1cl2]- [H2l1=(4s,5s)-Trans-4,5-Bis(1h-Inden-1-Ylmethyl)-2,2-Dimethyl- 1,3-Dioxolane:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.C 19918p"AUG J CHEM SOC DALTON TRANS ISI:A1991GB33400049t 3867-3878a6/Barlow, S. Cary, D. R. Drewitt, M. J. Ohare, D.pjSynthesis and structure of organometallic derivatives of 1,2,3,4,5,6,7,8-octamethyl-1,5-dihydro-s-indacene:3Journal of the Chemical Society-Dalton Transactions8"J. Chem. Soc.-Dalton Trans. 199720$OCT 21 J CHEM SOC DALTON TRANSISI:A1997YD75000031C 15 J ORGANOMET CHEMeISI:000166128700014n 2832-2834(4-Gun'ko, Y. K. Hitchcock, P. B. Lappert, M. F.( Nonclassical organolanthanoid metal chemistry: [K([18]-crown- 6)(eta(2)-PhMe)(2)]X (X = [(LnCp(3)(t))(2)(mu-H)], [(LnCp ''(2))(2)(mu-eta(6):eta(6)-PhMe)]) from [LnCp(3)(x)], K, and [18]-crown-6 in toluene (Ln = La, Ce; Cp-t = eta(5)- C5H4SiMe2But; Cp '' = eta(5)-C5H3(SiMe3)(2)-1,3)OrganometallicsOrganometallics  20001915JUL 24 ORGANOMETALLICSISI:000088374300004 4017-4022rD>Guzei, I. A. LiableSands, L. M. Rheingold, A. L. Winter, C. H.leSynthesis and characterization of titanium and zirconium complexes bearing diphenyltriazenido ligandsr Polyhedron Polyhedron 19971623 POLYHEDRONISI:A1997YA55800010207-213.@9Gyepes, R. Witte, P. T. Horacek, M. Cisarova, I. Mach, K.iCrystal structures of titanocene 2,2 '-bipyridyl complexes. Singlet versus triplet state dependence on methyl substituents at the cyclopentadienyl ligands*#Journal of Organometallic Chemistry9J. Organomet. Chem. 1998 551 1-20 JAN 30 J ORGANOMETAL CHEM0ISI:000073410100023  1814-1821n<5Hagenau, U. Heck, J. Kaminsky, W. Schauwienold, A. M.aHBZr-IV and Ta-V complexes with methane-bridged bis(aryloxy) ligands82Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem. 2000 626a8tAUG Z ANORG ALLG CHEMiISI:000088768100023aE`342<>@ 2889-2894R"Jones, S. B. Petersen, J. L.Preparation and Structural Characterization of Early- Transition-Metal Hydrides - [(Eta-5-C5h4ch3)2zrh(Mu-H)]2, a Binuclear Zirconium Hydride ComplexnInorganic Chemistryg Inorg. Chem. 1981209 INORG CHEMISI:A1981MD59800029M2,Jordan, V. Behrens, U. Olbrich, F. Weiss, E. 1996jcMetal alkyl and aryl compounds .55. Cyclopentadienyl and indenyl compounds off potassium and sodium*#Journal of Organometallic Chemistry! 517 1-2" 81-88#J. Organomet. Chem.ISI:A1996UU15000010Lorganopotassium compounds; organosodium compounds; cyclopentadienyl carbanions; indenyl carbanions; crystal structure MAIN-GROUP ELEMENTS; X-RAY STRUCTURE; COMPLEXES; COORDINATION; GEOMETRY The syntheses and crystal structures of the following solvated compounds are described: [cyclopentadienyl potassium(Et(2)O)](n) (1) (multidecker structure), [indenyl sodium(PMDTA)] (2) (PMDTA = N,N,N',N '',N ''- pentamethyldiethylenetriame) (monomeric), [indenyl potassium(TMEDA)](n) (3) (TMEDA = N,N,N',N'- tetramethylethylenediamine) (polymeric, zig-zag chain), and [indenyl potassium(PMDTA)](n) (4) (polymeric, zig-zag chain). The different coordination modes are the combined result of electrostatic and steric effects.a JUN 28 J ORGANOMETAL CHEM 147-152.82Jung, J. Noh, S. K. Lee, D. H. Park, S. K. Kim, H.f_Synthesis and characterization of Group 4 metallocene complexes with two disiloxanediyl bridgesa*#Journal of Organometallic Chemistry zirconium; hafnium; metallocene complexes; doubly bridged metallocene; disiloxane-bridged metallocene RAY MOLECULAR-STRUCTURES; ZIRCONIUM COMPLEXES; ZIRCONOCENE COMPLEXES; METATHESIS REACTIONS; POLYMERIZATION; DERIVATIVES; TITANOCENE; CATALYSTS; TITANIUM; DICHLORIDESGroup 4 metallocene complexes with two disiloxanediyl bridges [mu,mu-(Me2SiOSiMe2)(2)(C5H3)(2)]ZrCl2 (3) and [mu,mu- (Me2SiOSiMe2)(2)(C5H3)(2)]HfCl2 (4) have been prepared by the reaction of MCl4 (M = Zr, Hf) with distannylated bis(cyclopentadienes), while the zirconium complex, 3, was subjected to a single-crystal X-ray diffraction study. The reaction of TiCl4 with two equivalents of doubly disiloxane bridged distannylated bis(cyclopentadienes) gives rise to the formation of the doubly bridged dinuclear titanocene [mu,mu- (Me2SiOSiMe2)(2)(C5H3)(2)][TiCl3](2) (5), Methylation and benzylation of the complex 3 results in [mu,mu- (Me2SiOSiMe2)(2)(C5H3)(2)]ZrMe2 (6) and [mu,mu- (Me2SiOSiMe2)(2)(C5H3)(2)]-Zr(CH2C6H5)(2) (7), respectively, without complications. Furthermore, the dibridged zirconium compound 3 polymerizes ethylene very efficiently in the presence of methylaluminoxane with an activity of 5 ton of PE/[Z] mol h atm. (C) 2000 Elsevier Science S.A. All rights reserved.J. Organomet. Chem. 2000 595h2  FEB 15 J ORGANOMETAL CHEM ISI:000085336700001- 2511-2514Jutzi, P. Hielscher, B.H:4Reaction of Decamethylstannocene with Lithium AlkylsOrganometallics Organometallics 1986512DEC ORGANOMETALLICSeISI:A1986F451600018E583-584R82Jutzi, P. Leffers, W. Hampel, B. Pohl, S. Saak, W.@9Structure of a Crystalline Alkali-Metal Cyclopentadienide82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.E 19872662JUN ANGEW CHEM INT EDISI:A1987J197200027jcJutzi, P. Redeker,T. Neumann,B. Stammler, H. G. van der Zeijden,A.A.H. Mattheis, C. Frohlich,R.. 1997bis((mu!2$-Chloro)-(eta$5!-2-methoxyethyl-cyclopentadienyl)-dichloro-zirconium) (eta$5!-1,3-bis(bis(Isopropyl)phosphinomethyl-bis(methyl)silyl)-cyclopentadienylJ.Organomet.Chem.y 533h237 2651 RURQAW TIRQUGLHNc103-105NPJDiamond, G. M. Green, M. L. H. Mountford, P. Popham, N. A. Chernega, A. N.New Metallocene Compounds of Zirconium and Hafnium Showing Unusual Ansa-Ligand Coordination - X-Ray Crystal-Structures of [((Ch2)(5)C(Eta(5)-C5h4)(Eta(2)-C9h6))Zr(Eta(5)-C5h5)Cl] and [(Me(2)C(Eta(5)-C5h4)(Eta(3)-C13h8))Zr(Eta(5)-C5h5)Cl]>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 19941"JAN 7 J CHEM SOC CHEM COMMUNISI:A1994MT19700051921-938 B8Canadian Journal of Chemistry-Revue Canadienne De Chimie692J357-362C$Can. J. Chem.-Rev. Can. Chim.5ISI:A1991FA87600027TITANIUM AMIDES; STRUCTURES; TI N BONDING METAL HETEROBIMETALLIC COMPLEXES; CRYSTAL-STRUCTURE; REACTIVITY; ELECTROCHEMISTRY; TI; RH; ZR/Reaction of simple amides with TiCl4 affords mixed amido- chloride species Ti(NR2)(4-n)Cl(n). The trisamide-chloride species Ti(NR2)3Cl can be prepared directly employing three equivalents of amide or by reaction Ti(NR2)4 with TiCl4. The compound Ti(NMe2)3Cl, 1, crystallizes in the trigonal space group R3BARc, with a = 11.525(5), c = 14.939(3) angstrom, Z = 6, and V = 1718(1) angstrom 3. The compound Ti(NEt2)3Cl, 2, crystallizes in the monoclinic space group P2(1)/c, with a = 8.385(2) angstrom, b = 15.958(2) angstrom, c = 14.230(4) angstrom, beta = 107.79(1)degrees, Z = 4, and V = 1813(1) angstrom 3. The geometry of the Ti coordination sphere in these complexes is best described as pseudo-tetrahedral. The structural data are consistent with Ti-N multiple bonding. Preliminary results of EHMO calculations are consistent with d- pi-p-pi Ti-N bonding. Attempts to replace the halides with phosphides (LiPR2, R = Me, Et, Ph) led not to the Ti(IV) phosphido species, but rather to redox chemistry yielding Ti(III) amides and P2R4. The barrier to rotation about the Ti- N bonds has been considered. Variable temperature H-1 NMR studies reveal that the barrier is small. Extended Huckel total energy minimization calculations have been performed. In addition, MMX calculations of the barrier to Ti-N rotation are reported. The results of these calculations imply that the rotational barrier is dominated by steric effects.FEB CAN J CHEM 2811-2816  Dick, D. G. Stephan, D. W.|uTitanocene(Iii) Phosphides - Trapping and Structure of Mononuclear Intermediates in the Formation of [Cp2ti(Mu-Pr2)]2OrganometallicsMETAL HETEROBIMETALLIC COMPLEXES; M = ZR; MOLECULAR-STRUCTURE; COOPERATIVE ACTIVATION; R =; CRYSTAL; REACTIVITY; DERIVATIVES; ZIRCONIUM; CHEMISTRY2+Intermediates in the reactions of Cp2TiCl2 with phosphides have been previously inferred by EPR studies. In this report two intermediates are trapped, isolated, and structurally characterized. Reaction of LiPR2 (R = Et, Ph) with Cp2TiCl2 in the presence of PMe3 yields the compounds Cp2TiPR2(PMe3) (3). The compound Cp2TiPPH2(PMe3) (3b) crystallizes in the space group P2(1)/c with a = 8.716 (3) angstrom, b = 25.914 (13), c = 10.225 (5) angstrom, Z = 4, and V = 2276 (2) angstrom 3. With the employment of excess phosphide and TMEDA, the compounds [Li(TMEDA)2][Cp2Ti(PR2)2] (4) are obtained. The compound [Li(TMEDA)2][Cp2Ti(PPh2)2] (4b) crystallizes in the space group P2(1)/c with a = 13.058 (5) angstrom, b = 19.312 (5) angstrom, c = 18.441 (6) angstrom, Z = 4, and V = 4613 (4) angstrom 3. The synthesis, isolation, and structural studies of these compounds serve not only to confirm the nature of the intermediates and the mechanism of formation of [Cp2Ti(mu- PR2)]2 but also to represent the first structural studies of mononuclear titanium phosphide complexes.Organometallics 1991108AUG ORGANOMETALLICSISI:A1991GA27500052have been synthesized from the appropriate LnCl(3), TmI3, or LnI(2) with the selected sodium or potassium cyclopentadienide. The complexes were characterized by H-1, C- 13, Si-29, and Yb-171 (for Yb(II) complexes) NMR spectroscopy, elemental analysis, and mass spectrometry. The molecular structures of [{NdCp2R(mu-Cl)}(2)], [{TmCp22tt(mu-I)}(2)], and [Yb(Cp-2(R')-SiMe2)(THF)(2)] have been determined by single- crystal X-ray diffraction studies. Attempts to reduce the complexes [{NdCp2R(mu-Cl)}(2)], [{NdCp2tt(mu-Cl)}(2)], and [{TmCp2tt(mu-I)}(2)] are described.Organometallics 20001917AUG 21 ORGANOMETALLICSISI:000088956200024Ho, J., Stephan, D. W. 1992HBCyclopentadienyl C-H activation in zirconocene phosphide complexesOrganometallicsr11 1014-1016e60Ho, J., Hou, Z. M., Drake, R. J., Stephan, D. W. 1993P-H and cyclopentadienyl C-H activation en route to homo- and heterobinuclear zirconocene phosphide and phosphinidene complexesOrganometallics)12 3145-3157* 3792-3793,%Ho, J. W. Drake, R. J. Stephan, D. W.[Cp2zr(Mu-Pph)]2[((Thf)3li)2(Mu-N2)] - a Remarkable Salt of a Zirconocene Phosphinidene Dianion and Lithium Dication Containing Side-Bound Dinitrogen.(Journal of the American Chemical SocietyxqTRANSITION-METAL-COMPLEXES; RAY CRYSTAL-STRUCTURE; MOLECULAR- STRUCTURE; NITROGEN-FIXATION; ACTIVATION; CHEMISTRYJ. Am. Chem. Soc. 1993 1159MAY 5 J AMER CHEM SOCISI:A1993LA67800062 2676-2677Hoffman, D. M. Lee, S.zsSynthesis of Pyridine Complexes of Zirconium(Iii) Chloride and the Apparent Oxidation to Zirconium(Iv) by a NitrileInorganic Chemistry Inorg. Chem. 19923113JUN 24 INORG CHEMHISI:A1992JA547000021680-INOR$Hoffman, D. M. Lee, S. Suh, S.JCSynthesis and Reactions of Pyridine Ligated Zirconium(Iii) Chloride:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1992 2036&APR 5 2 ABSTR PAP AMER CHEM SOC8ISI:A1992HK16201088712-713R@:Hofmann, P. Frede, M. Stauffert, P. Lasser, W. Thewalt, U.Monomeric, Mononuclear Enediolate Complexes of Zirconium - Molecular-Geometry and Electronic-Structure of the Products of Reductive Co Coupling on the Metal82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.l 19852480ANGEW CHEM INT EDnISI:A1985ASE1600025c ,`HsZ72654237-245.81Jutzi, P. Redeker, T. Neumann, B. Stammler, H. G.aHalf-sandwich complexes of titanium and zirconium with the (diisopropylaminoethyl)cyclopentadienyl ligand - Molecular structure of [((C5H4CH2CH2NCH)(i)Pr-2)ZnCl3](+)Cl-.2CH(3)OHS*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1997 533 1-2 APR 15 J ORGANOMETAL CHEMISI:A1997XH52700031663-674MJutzi, P. Redeker, T.nNHAminoethyl-functionalized cyclopentadienyl complexes of d-block elements.'European Journal of Inorganic ChemistryEur. J. Inorg. Chem. 19986JUN EUR J INORG CHEMISI:000073982900001n 3797-+ Jutzi, P.XQStable systems with a triple bond to silicon or its homologues: Another challenge.'Angewandte Chemie-International EditionAngew. Chem.-Int. Edit.o 20003921ANGEW CHEM INT ED0ISI:000165202200009O322-INOR Jutzi, P.:3Highlights in the Cp*-chemistry of p-block elements:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 2000 2199& MAR 26 1 ABSTR PAP AMER CHEM SOCISI:0000872461044572 2237-2244Jutzi, P. Reumann, G.A*$Cp* Chemistry of main-group elements:3Journal of the Chemical Society-Dalton TransactionsP"J. Chem. Soc.-Dalton Trans.n 200014J CHEM SOC DALTON TRANSEISI:0000887588000017 42-46HAJutzi, P. Keitemeyer, S. Neumann, B. Stammler, A. Stammler, H. G.`ZSynthesis and structure of the first oxygen-donor-stabilized organogermanium(II) compoundsOrganometallicsOrganometallics 2001201JAN 8 ORGANOMETALLICSISI:000166330400009180-18560Jutzi, P. Muller, C. Neumann, B. Stammler, H. G.xrDialkylaminoethyl-functionalized ansa-zirconocene dichlorides: synthesis, structure, and polymerization properties*#Journal of Organometallic Chemistry ansa-metallocenes; MAO; N-ligands; polymerization; zirconium CYCLOPENTADIENYL COMPOUNDS; ORGANOMETALLIC COMPOUNDS; PROPENE POLYMERIZATION; OLEFIN POLYMERIZATION; METALLOCENE CATALYSTS; ZIRCONIUM COMPLEXES; ALKANE ELIMINATION; CRYSTAL-STRUCTURES; SIDE-CHAIN; PROPYLENEtDonor substituted carbon- and silicon-bridged zirconocene dichlorides of the type [eta (5)-C13H8-CMe2-eta (5)- C5H3(CH2CH2NR2)]ZrCl2 (R = Me (2a), Et (2b), Pr-i (2c)) and [eta (5)-C13H8-SiMe2-eta (5)-C5H3(CH2CH2NR2)]ZrCl2 (R = Me (4a), Et (4b), Pr-i (4c)) have been prepared. Activation of 2a- c and 4a-c with excess methylalumoxane results in the formation of catalytically active species for the polymerization of ethylene and propylene. (C) 2001 Elsevier Science B.V. All rights reserved.J. Organomet. Chem. 2001 6252APR 22 J ORGANOMET CHEMISI:000168575100007308-311F>7Kang, K. K. Oh, J. K. Jeong, Y. T. Shiono, T. Ikeda, T.1^WHighly active MgCl2-supported CpMCl3 (M = Ti, Zr) catalysts for ethylene polymerizationm*#Macromolecular Rapid CommunicationsiMacromol. Rapid Commun.a 1999206 JUN MACROMOL RAPID COMMUNISI:000080690400003- 57-64.NGKang, Y. C. Milovancev, M. M. Clauss, D. A. Lange, M. A. Ramsier, R. D. LEUltra-high vacuum investigation of the surface chemistry of zirconium"Journal of Nuclear MaterialsJ. Nucl. Mater.c 2000 28118SEP J NUCL MATERISI:0000893218000060 1494-1499n,&Kasani, A. Gambarotta, S. Bensimon, C.Zirconium alkyl and borohydride complexes stabilized by a sterically demanding anionic organic amide. The crystal structures of ZrMeL3 (2) and Zr(BH4)L-3 (3) (L = (3,5- Me2Ph)N(Ad); Ad equals adamantyl)>8Canadian Journal of Chemistry-Revue Canadienne De Chimie$Can. J. Chem.-Rev. Can. Chim. 19977511NOV CAN J CHEMISI:000071518100008bhlXܐnY 10573-10580lPJDodge, T. Curtis, M. A. Russell, J. M. Sabat, M. Finn, M. G. Grimes, R. N.}Titanium and zirconium Et2C2B4H4-metal-phosphine complexes: Synthesis, characterization, and ethylene polymerization activity.(Journal of the American Chemical SocietyORGANOTRANSITION-METAL METALLACARBORANES; OLEFIN POLYMERIZATION; STRUCTURAL CHARACTERIZATION; CRYSTAL-STRUCTURE; ORGANOMETALLIC COMPOUNDS; INSERTION REACTIONS; METALLOCENE MIMICS; CARBORANE LIGANDS; BUILDING-BLOCKS; CATALYSTSThe synthesis, structures, and reactivity of a series of 14- electron complexes including L2Cl2Ti-(Et2C2B4H4) (1-3, L-2 = 2 PMe3, Me2P(CH2)(2)PMe2, or Me2P(CH2)(3)PMe2], [Me2P(CH2)(3)PMe2](2)Me2Ti- (Et2C2B4H4) (22), and related compounds are reported together with the preparation and spectroscopic characterization of the analogous zirconium species L2Cl2Zr(Et2C2B4H4) (L-2 = 2PMe(3) or Me2P(CH2)(3)PMe2 (24 and 25). Compounds 1-3, 22, and 25 are catalyst precursors for the polymerization of ethylene at 1 atm pressure in the presence of methylaluminoxane, thus extending Ziegler-Natta chemistry for the first time to complexes of the [R2C2B4H4](2-) Small carborane ligands. Although the choice of phosphine ligand has a dramatic effect on catalyst activity, NMR data reveal aluminum-phosphine binding under conditions approximating the catalytic mixtures for the PMe3 and Me2P(CH2)(2)PMe2 (dmpe) systems, whereas the state of Me2P(CH2)(3)PMe2 (dmpp) coordination is not clear. Multiple catalyst species are probably active in these reaction mixtures, giving rise to polyethylene products of broad polydispersity; melting points and C-13 NMR data provide evidence for significant chain branching. (dmpp)Me2Ti(Et2C2B4H4) produces a highly active ethylene polymerization catalyst with much narrower molecular weight distributions than the other systems described here. The complexes (PMe3)(2)Cl2Ti(Et2C2B4H4) (1), (dmpp)Cl2Ti(Et2C2B4H4) (3), and (dmpp)Me2Ti(Et2C2B4H4) (22) have been structurally characterized by X-ray crystallography.J. Am. Chem. Soc. 2000 12243NOV 1 J AM CHEM SOCISI:000165205000009 2111-2118HADoerrer, L. H. Green, M. L. H. Haussinger, D. Sassmannshausen, J.b\Evidence for cationic Group 4 zirconocene complexes with intramolecular phenyl co-ordination:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.m 199913$JUL 7 J CHEM SOC DALTON TRANS-ISI:000081308600002  1018-1029aXQDoherty, S. Errington, R. J. Housley, N. Ridland, J. Clegg, W. Elsegood, M. R. J. *$N-alkoxy-beta-ketoiminate complexes of groups 4 and 5: Synthesis and characterization of the complexes [(eta(5)- C5H4R)M{CH3C(O)CHC(NCH2CHR ' O)CH3}Cl-n] (M = Ti, n = 1; M = Nb, n = 2; R = H, Me; R ' = H, Me), [Ti{CH3C(O)CHC(NCH2CHR ' O)CH3}Cl-2(thf)], and [Ti{CH3C(O)CHC(NCH2CHR ' O)CH3}(2)]OrganometallicsOrganometallics 1999186MAR 15 ORGANOMETALLICSISI:000079256000013inaphthyl ligands-OrganometallicsOrganometallicst 2000195HMAR 6 ORGANOMETALLICSRISI:0000858112000280316-324M2+Janiak, C. Lange, K. C. H. Scharmann, T. G.,Zirconium-chelate and mons-eta-cyclopentadienyl zirconium- chelate/methylalumoxane systems as soluble Ziegler-Natta olefin polymerization catalysts& Applied Organometallic ChemistryAppl. Organomet. Chem. 20001467 JUN APPL ORGANOMETAL CHEM3ISI:000087530800003I ib9MN`fg{*#~180-186 0)Troyanov, S. I. Meetsma, A. Teuben, J. H.h Trimethylphosphine halide complexes of titanium, zirconium and hafnium in oxidation states IV, III and II. Crystal structure of MI4(PMe3)(n) (M=Zr, n=3; M=Hf, n=2.5), M2X6(PMe3)(4) (M=Hf, Ti, X=1; M=Zr, X=Br) and (mu-eta(6),eta(6)-C6H6)Hf2I4- (PMe3)(4)center dot C6H6Inorganica Chimica ActaInorg. Chim. Acta 1998 271 1-2APR 15 INORG CHIM ACTAISI:000072704800027145-149.6/Trzeciak, A. M. Ziotkowski, J. J. Choukroun, R.oHydroformylation of olefins catalysed with bimetallic systems: HRh{P(OPh)(3)}(4)+cp(2)ZrH(CH(2)PPh(2)) and HRh(CO){P(OPh)(3)}(3)+cp(2)ZrH(CH(2)PPh(2))*#Journal of Organometallic ChemistryJ. Organomet. Chem.  1996 5251 1-2T NOV 15 J ORGANOMETAL CHEMZISI:A1996WA21200019-875-876$Ura, Y. Hara, R. Takahashi, T.rkCompletion of a catalytic cycle of zirconium-catalyzed alkylation of silanes by addition of organic halidesrChemical Communications<6ZIRCONOCENE; DERIVATIVES; COMPLEXES; REAGENTS; ALKENESA catalytic cycle in zirconium-catalyzed alkylation of silanes with secondary Grignard reagents was completed by addition of organic halides which were not incorporated in the products. Chem. Commun. 200010 CHEM COMMUNISI:000086900800034e 1171-+JCUra, Y. Li, Y. Z. Tsai, F. Y. Nakajima, K. Kotora, M. Takahashi, T. F?Preparation of Sn-, Ge-, and Si-heterocycles from zirconacyclesd HeterocyclesCARBON BOND FORMATION; METAL-PROMOTED CYCLIZATION; METALLACYCLE TRANSFER; BENZENE-DERIVATIVES; GRIGNARD-REAGENTS; CONVENIENT METHOD; ZIRCONACYCLOPENTADIENES; ZIRCONIUM; ALKYNES; RING`ZStannacycles such as stannacyclopentanes, stannacyclopentenes and stanacyclopeneadienes were prepared from the corresponding zirconacycles. The effect: of addition of CuCl on the reaction of zirconacycles with tin halides is remarkable. In the case of germanium and silicon halides, the remarkable effect of CuCl addition was not observed. Symmetrical or unsymmetrical germa- and silacycles were prepared by the reaction of silicon or germanium halides with dilithio compounds prepared from the corresponding zirconacycles. Several heterocyclic compounds containing two metalloatoms were also prepared. Heterocycles 2000523yMAR 1 HETEROCYCLESISI:000086813700023r356-357.0*Ura, Y. Jin, M. Nakajima, K. Takahashi, T.voFormation of ethylene-bridged bimetallic zirconocene complexes by coupling of Cp2ZrEt2 and Cp2ZrX2 (X=Cl or Br)nChemistry Letters ZIRCONIUMkCp2ZrEt2 reacted with one equiv of Cp2ZrX2 (X = Cl or Pr) in THF To afford ethylene-bridged bimetallic zirconocene complexes, (Cp2ZrX)(2)(CH2CH2) (X = Cl (2a), or Br (2b)), in high yields. The structure of 2b was determined by X-ray analysis. Reactions of 2a-b with various anions Y- gave a series of ethylene-bridged bimetallic zirconocene complexes, (Cp2ZrY)(2)-(CH2CH2) (Y = Ph, Me, Bu, CH2SiMe3) in good to high yields.  Chem. Lett.d 20014tAPR 5 CHEM LETTrISI:000168436200037a\UUrazovskii, I. F. Ponomarev, V. I. Atovmayn, L. O. Nifantev, I. E. Lemenovskii, D. A. 1987f_1st Structural Characterization of a Mononuclear Organometallic Compound of Trivalent ZirconiumcRLBulletin of the Academy of Sciences of the USSR Division of Chemical Science369 1992-1992ISI:A1987N843000040*#SEP 2 BULL ACAD SCI USSR D CHEM SCI287-294ALEUrazowski, I. F. Ponomaryev, V. I. Nifantev, I. E. Lemenovskii, D. A.piZr and Hf Metallocenes - Study of the Structure of a Novel Mononuclear Zirconium Trivalent OrganometallicC*#Journal of Organometallic ChemistryJ. Organomet. Chem.J 1989 368032 JUN 13 J ORGANOMETAL CHEMISI:A1989AA21600005M155-166 82Ushioda, T. Green, M. L. H. Haggitt, J. Yan, X. F.jcSynthesis and catalytic properties of ansa-binuclear metallocenes of the Group IV transition metals*#Journal of Organometallic ChemistrymJ. Organomet. Chem. 1996 518A 1-2S JUL 12 J ORGANOMETAL CHEM0ISI:A1996UW69600018SB P,>R&*#Roesky,H.W. Murphy,E. M. Albers,T.i 1999bis(tris(mu!2$-Fluoro)-dimethyl-((dimethyl(isopropyl)silyl)-(2,6-dimethylphenyl) (eta$5!-(2-Diphenylphosphinoethyl)-cyclopenta-2,4-dienyl)-trichloro-tetrahydrofurPrivate CommunicationL HOYBUS JUQQAN692-693.(Rogers, R. D. Bynum, R. V. Atwood, J. L.1st Authentic Example of a Difference in the Structural Organometallic Chemistry of Zirconium and Hafnium - Crystal and Molecular-Structure of (Eta-5-C5h5)2hf(Eta-1-C5h5)2.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1981 1033J AMER CHEM SOCISI:A1981LB70700044TMRogers, R. D., Benning, M. M., Kurihara, L. K., Moriaty, K. J., Rausch, M. D. 1985J. Organometal. Chem 29351 41-47."Rogers, R. D. Teuben, J. H.d^Structure of (Eta-5-C5me5)(Eta-8-C8h8)Zr, an Aromatic Mixed Sandwich Complex of Zirconium(Iii)*#Journal of Organometallic ChemistryyJ. Organomet. Chem.a 1989 359a19JAN 3 J ORGANOMETAL CHEMISI:A1989R663500005- 3976-3980E2,Rogers, J. S. Lachicotte, R. J. Bazan, G. C.`YFulvene to cyclopentadienyl conversion with homoleptic complexes of zirconium and hafniumnOrganometallicsaOrganometallics 19991820SEP 27 ORGANOMETALLICSISI:000083033500009M319-INOR Rogers, J. S. Bazan, G. C.`YFulvene-to-cyclopentadienyl conversion with homoleptic complexes of zirconium and hafnium:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 2000 219& MAR 26 1 ABSTR PAP AMER CHEM SOCISI:000087246104454157-163CRohmer, M. M. Benard, M.Superlong Metal Metal Single Bonds in Bimetallic Complexes of Zirconium(Iii) - Extended Huckel and Abinitio Self-Consistent Field Configuration-Interaction StudyOrganometallicsOrganometallics 1991101iJAN ORGANOMETALLICSmISI:A1991ER63000043 5016-5019ZPIRosenthal, U. Ohff, A. Michalik, M. Gorls, H. Burlakov, V. V. Shur, V. B.SInteraction of the Zirconocene Alkyne Complex Cp2zr(Thf)(Me3sic2sime3) and the Binuclear Zirconium Sigma- Alkenyl Complex (Cp[Mu-(Eta(1)-Eta(5)- C5h4)]Zr[C(Sime3)=Ch(Sime3)])2 with Carbon-Dioxide and WaterLOrganometallicsTTITANOCENE; TOLANEIt has been shown that the bis(trimethylsilyl)acetylene complex of zirconocene Cp2Zr(THF)(Me3SiC2SiMe3) (1) and the binuclear sigma-alkenyl complex of zirconium {Cp[mu-(eta1:eta5- C5H4)]Zr[C(SiMe3)=CH(SiMe3)]12 (2) readily react with carbon dioxide at room temperature to form the dimeric zirconafuranone metallacycle [Cp2ZrC(SiMe3)=C(SiMe3)C(O)O]2(3). Under similar conditions the reaction of Cp2Zr(THF)(Me3SiC2SiMe3) and {Cp[mu- (eta1:eta5-C5H4)]Zr[C(SiMe3)=CH(SiMe3)]}2 with water affords the zirconoxane complex [Cp2ZrC(SiMe3)=CH(SiMe3)]2O (4). The structures of the obtained complexes have been established by X-ray structure analysis.Organometallics 19931212DEC ORGANOMETALLICSISI:A1993MM12900050 1193-1195uPIRosenthal, U. Ohff, A. Michalik, M. Gorls, H. Burlakov, V. V. Shur, V. B.cTransformation of the 1st Zirconocene Alkyne Complex without an Additional Phosphane Ligand into a Dinuclear Sigma-Alkenyl Complex by Hydrogen-Transfer from Eta(5)-C5h5 to the Alkyne Ligandl82Angewandte Chemie-International Edition in EnglishtmAGOSTIC ALKENYLZIRCONOCENE COMPLEXES; METAL-PROMOTED CYCLIZATION; MOLECULAR-STRUCTURE; REACTIVITY; TITANOCENEC<6The agostic interaction between the alkenyl CH groups and the Zr centers is the most notable feature of the dinuclear complex 1, which is formed from the alkyne complex [Cp2Zr(thf)(Me3SiC=CSiMe3)] upon thermal loss of THF. In this transformation a H atom is transferred from the Cp ligand to the alkyne ligand.$Angew. Chem.-Int. Edit. Engl.e 1993328eAUG ANGEW CHEM INT EDXISI:A1993LU3380003162-ORGN. Rosenthal, U. Burlakov, V.& New Zirkonocene-Alkyne Complexes:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1993 205R& MAR 28 2 ABSTR PAP AMER CHEM SOCISI:A1993KQ98300198m203-207.ZTRosenthal, U. Ohff, A. Baumann, W. Tillack, A. Gorls, H. Burlakov, V. V. Shur, V. B.LEZirconadihydrofuran Complexes - Preparation, Structure and Reactivityz*#Journal of Organometallic ChemistrysZIRCONIUM; METALLOCENES; METALLACYDE; ALKYNE; KETONE; TRIMETHYLSILYL METAL-PROMOTED CYCLIZATION; ZIRCONOCENE ALKYNE COMPLEX; SIGMA- ALKENYL COMPLEX; TITANOCENE; TOLANE; LIGANDThe zirconocene alkyne complexes Cp(2)Zr(THF)(Me(3)SiC=CSiMe(3)) (1) and Cp(2)Zr(py)(Me(3)SiC=CSiMe(3)) (2) react with acetone to yield the new zirconadihydrofurane complex Cp(2)Zr-O-C(Me(2))- C(SiMe(3))=C(SiMe(3)) (3). Reaction of 3 with tolan gives, under substitution of the alkyne moiety, a further dihydrofurane compound Cp(2)Zr-O-C(Me(2))-C(Ph)=C(Ph) (4). Complexes 3 and 4 are characterized by NMR and X-ray structure analyses. They are compared with the known titanocene complex Cp(2)Ti-O-C(Me(2))-C(Ph)=C(Ph) (5) to study the influence of the metals M = Ti, Zr and the substituents R = Ph, SiMe(3) in selected metalladihydrofuranes Cp(2)M-O-C(Me(2))-C(R)=C(R). Although the structures of complexes 3 and 4 are similar, the complexes display different reactivities. Thus 3 is capable of reacting with tolan, CO2 and water at room temperature, while 4 is inactive towards these compounds under the same conditions.J. Organomet. Chem. 1994 484 1-2 DEC 27 J ORGANOMETAL CHEMISI:A1994PZ70600030FVX n 5559-5567 0)Royo, E. Royo, P. Cuenca, T. Galakhov, M.wInsertion of terminal and internal acetylenes into the Zr-mu- methylene bond of the dinuclear cationic zirconium complex [{Zr(eta(5)-C5H5)}(2)(mu-CH2)(mu-Cl)(mu-eta(5)-C5H4-eta(5)- C5H4)][BMe(C6F5)(3)]. Synthetic aspects, NMR spectroscopic study, and dynamic behavior in solution-OrganometallicsBGROUP-4 METALLOCENE COMPLEXES; ZIEGLER-NATTA CATALYSTS; MOLECULAR-STRUCTURE; POLYMERIZATION CATALYSIS; OLEFIN POLYMERIZATION; ALKYL COMPLEXES; CARBON-MONOXIDE; METHYLALUMINOXANE CATALYST; ALKYLZIRCONIUM COMPLEXES; TETRAVALENT ZIRCONIUMfThe dinuclear cationic zirconium species [{Zr(eta (5)- C5H5)}(2)(mu -CH2)(mu -Cl)(mu-eta (5)-C5H4)] [BMe(C6F5)(3)] (1) reacts in dichloromethane at -78 degreesC with terminal alkynes, via insertion into the Zr-mu -methylene bond, to give various dinuclear cationic derivatives. Reaction of 1 with Me3SiC=CH gives the hydride complex [[Zr(eta (5)-C5H5)}(2)(mu - Cl)(mu -H)(CH2C=CSiMe3)(mu-eta (5)-C5H4-eta (5)- C5H4)][BMe(C6F5)(3)] (2), whereas 1-pentyne and 3,3-dimethyl-1- butyne give the; mu-eta (1)-eta (3)-(2-alkyl)allyl derivatives [{Zr(eta (5)-C5H5)}(2)(mu -Cl){mu-[eta (1)-eta (3)-CHC(Pr- n)CH2]}(mu-eta (5)-C5H4-eta (5)-C5H4)] [BMe(C6F5)(3)] (3) and [{Zr(eta (5)-C5H5)}(2)(mu -Cl){mu-[eta (1)-eta (3)-CHC(Bu- t)CH2]}(mu-eta (5)-C5H4-eta (5)-C5H4)] [BMe(C6F5)(3)] (4) Compounds 3 and 4 show dynamic behavior in solution involving an interchange between two enantiomeric structures through a suprafacial migration of the. "-RC=CH2" moiety. When compound 1 was treated with a molar equivalent bf internal alkynes RC=CR (R = Et, Pr-n), formation of [{Zr(eta (5)-C5H5)}(2)(mu -Cl){mu -CH2C(Et)=C(Et)}(mu-eta (5)-C5H4-eta (5)-C5H4)] [BMe(C6F5)(3)] (5) and [{Zr(eta (5)-C5H5)}(2)(mu -Cl){mu -CH2C(Pr-n)=C(Pr- n)}(mu-eta (5)-C5H4-eta (5)-C5H4)] [BMe(C6F5)(3)] (6) was observed, which were isomerized to the [{Zr(eta (5)- C5H5)}(2)(mu -Cl) {mu -CH2C(Et)CH=CHMe}(mu-eta (5)-C5H4-eta (5)-C5H4)][BMe(C6F5)(3)] (7) and [{Zr(eta (5)-C5H5)}(2)(mu - Cl){mu -CH2C(Pr-n) CH=CHEt}(mu-eta (5)-C5H4-eta (5)- C5H4)][BMe(C6F5)(3)] (8) derivatives at room temperature, through a beta-alpha hydrogen migration. The new complexes reported were characterized by elemental analysis and IR and NMR spectroscopy.Organometallics 20001926DEC 25 ORGANOMETALLICSISI:000166165800005 4669-4673HRuchatz, D. Fink, G.b\Ethene-norbornene copolymerization using homogenous metallocene and half-sandwich catalysts: Kinetics and relationships between catalyst structure and polymer structure. 1. Kinetics of the ethene-norbornene copolymerization using the [(isopropylidene)(eta(5)-inden-l-ylidene-eta(5)- cyclopentadienyl)]zirconium dichloride methylaluminoxane catalystMacromoleculesMacromolecules 19983115JUL 28 MACROMOLECULESISI:000075174800001Ruff, O., Wallstein, R. 1923Z. Anorg. Allg. Chem.u 128-96695-698.Rumpf, C. Bensch, W.tmSynthesis and crystal structure of new ternary chalcogenides of group IV metals: K2ZrS4, Rb2ZrS4, and Rb2HfS4NGZeitschrift Fur Naturforschung Section B-a Journal of Chemical SciencesrZ.Naturforsch.(B)0 2000558MAUG Z NATURFORSCH SECT BISI:000088826900005I 9597-9606>7Rush, G. E. Chadwick, A. V. Kosacki, I. Anderson, H. U.jcAn EXAFS study of nanocrystalline yttrium stabilized cubic zirconia films and pure zirconia powderst&Journal of Physical Chemistry BOJ. Phys. Chem. B 2000 104041OCT 19 J PHYS CHEM BISI:000165233100005 $H(\V@J,X 2837-2843Antinolo, A. Carrillo-Hermosilla, F. Corrochano, A. Fernandez-Baeza, J. Lara-Sanchez, A. Ribeiro, M. R. Lanfranchi, M. Otero, A. Pellinghelli, M. A. Portela, M. F. Santos, J. V.Synthesis of zirconium(IV) monocyclopentadienyl-aryloxy complexes and their use in catalytic ethylene polymerization. X-ray structure of (eta(5)-C5Me5)Zr{2,6-OC6H3(CH3)(2)}(3)OrganometallicsOrganometallics 20001915JUL 24 ORGANOMETALLICSISI:000088374300006 71-78;d]Antinolo, A. Lopez-Solera, I. Orive, I. Otero, A. Prashar, S. Rodriguez, A. M. Villasenor, E.hNiobium and zirconium complexes incorporating asymmetrically substituted ansa ligands. X-ray crystal structures of [Me2Si(eta(5)-C5Me4)(eta(5)-C5H3R)]Nb(=(NBu)-Bu-t)Cl (R = Me, Pr-i) and [Me2Si(eta(5)-C5Me4) (eta(5)-C5H3R)]ZrCl2 (R = H, Me)Organometallics ALPHA-OLEFIN POLYMERIZATION; ZIRCONOCENE CATALYSTS; TRANSITION- METALS; IMIDO COMPLEXES; SYNDIOTACTIC POLYPROPYLENE; METALLOCENE DERIVATIVES; GROUP-4 METALLOCENES; NIOBOCENE COMPLEXES; ANCILLARY LIGAND; TANTALUMnhThe asymmetric ansa-ligand precursors (CsMe4H)SiMe2(C5H4R) (R = H (1), Me (2), SiMe3 (3), Pr-i (4)) and their lithium derivatives [Me2Si(C5Me4)(C5H3R)]Li-2 (R = H (5), Me (6), SiMe3 (7), Pr-i (8)) have been prepared. The ansa-niobocene imido complexes [Me2Si(eta (5)-C5Me4)(eta (5)-C5H3R)]Nb(=(NBu)-Bu- t)Cl (R = H (9), Me (10), SiMe3 (11),Pr-i (12)) were synthesized by the reaction of Nb(=(NBu)-Bu-t)Cl-3(py)(2) with [Me2Si(C5Me4)(C5H3R)]Li-2 in THF. The ansa-zirconocene complexes [Me2Si(eta (5)-C5Me4)(eta (5)-C5H3R)]ZrCl2 (R = H (13), Me (14), SiMe3 (15), Pr-i (16)) were prepared by the reaction of ZrCl4 and the corresponding lithiated ansa- derivative. The molecular structures of 10, 12, 13, and 14 were determined by single-crystal X-ray diffraction studies. Preliminary results for the catalytic activity of 13-16 in the polymerization of ethylene are reported.Organometallics 2001201JAN 8 ORGANOMETALLICSISI:000166330400013 2435-2444aPJAntonelli, D. M. Gomes, P. T. Green, M. L. H. Martins, A. M. Mountford, P.<5asna-eta-Cyclopentadienylimide derivatives of niobium:3Journal of the Chemical Society-Dalton Transactionsc"J. Chem. Soc.-Dalton Trans. 199714$JUL 21 J CHEM SOC DALTON TRANSISI:A1997XN38100010265-270VPArevalo, S. Benito, J. M. de Jesus, E. de la Mata, F. J. Flores, J. C. Gomez, R.VPSynthesis of mono- and dinuclear cyclopentadienyl-aryloxy titanium(IV) complexes*#Journal of Organometallic ChemistryeJ. Organomet. Chem. 1999 592E2 DEC 25 J ORGANOMETAL CHEMUISI:000084488300014 4369-4375ihbArmstrong, D. R. Henderson, K. W. Little, I. Jenny, C. Kennedy, A. R. McKeown, A. E. Mulvey, R. E.Zirconocene ketimides: Synthesis, structural characterization, ethylene polymerization activity, and ab initio computational studiesOrganometallicsOrganometallics 20001921OCT 16 ORGANOMETALLICSISI:000090086200025 1281-1285m@9Arndt, P. Lefeber, C. Kempe, R. Tillack, A. Rosenthal, U.tReactions of lactams with titanocene- and zirconocene-alkyne complexes as elemental steps in catalytic anionic ring-opening polymerization of lactamsiChemische Berichtezirconocenes; titanocenes; N-methyl-epsilon-caprolactam; beta- propiolactam; epsilon-caprolactam; ring-opening polymerization SIGMA-ALKENYL COMPLEX; REGIOSELECTIVE REACTIONS; OXOVANADIUM(IV); LIGAND; BONDSCDepending on the nature of the metal and the ring size, lactams react with titanocene and zircocene complexes of bis(trimethylsilyl)acetylene Cp(2)Ti(Me(3)SiC(2)SiMe(3)) and Cp(2)Zr(L)(Me(3)SiC(2)SiMe(3)) (L = Py, THF) to yield different products. In the reaction of Cp(2)Zr(Py)(Me(3)SiC(2)SiMe(3)) with N-methyl-epsilon-caprolactam a simple ligand exchange reaction occurs and the complex Cp(2)Zr(Me(3)SiC(2)SiMe(3))[O = C-N(Me)-(CH2)(5)] (1) was isolated. With beta-propiolactam the alkenyl-amido complex Cp(2)Zr[-C(SiMe(3)) = C(H)(SiMe(3))][-N- CO-CH2-CH2] (2) was obtained, which indicates that an agostic metal-hydrogen interaction has taken place. The reaction of Cp(2)Ti(Me(3)-SiC(2)SiMe(3)) with epsilon-caprolactam gives after elimination of the alkyne and molecular hydrogen the first early transition metal complex with a deprotonated coordinated epsilon-caprolactam in a eta(2)-amidate bonding fashion Cp(2)Ti-O-C-N-(CH2)(5) (3). The obtained complexes were characterized by NMR spectra (1, 2) and crystal structure analysis (1-3) and discussed as elemental steps in anionic ring-opening polymerization of lactams catalyzed by metallocene-alkyne complexes.Chem. Berichte 1996 129410 OCT CHEM BERISI:A1996VN63600021JCArnold, J. Engeler,M. P. Elsner, F. H. Heyn, R. H. Tilley, T. D.f 1989VPtetrakis(mu!2$-Chloro)-(mu!3$-oxo)-tris(chloro-(eta$5!-pentamethyl-cyclopentadieOrganometallics8 2284 KEWVUD 2014-2016Y81Ashe, A. J. AlAhmad, S. Kampf, J. W. Young, V. G.PIBoratabenzene zirconium(II) complexes: An unusual annulation with ethynes82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl. 19973618OCT 2 ANGEW CHEM INT EDSISI:A1997YA81300027O 4234-4236g,%Ashe, A. J. Al-Ahmad, S. Kampf, J. W.YjdReaction of bis(1-substituted-1-boratabenzene)bis- (trimethylphosphine)zirconium(II) with 1,3-diynesOrganometallics Organometallicst 19991820SEP 27 ORGANOMETALLICSISI:0000830335000438 fl7E`ZpihP 2967-2970  Samuel, E.Reduction of Zirconocene Dihalides with Magnesium Studied by Electron-Spin-Resonance - Evidence of Zirconium(Iii) Hydride Formation by Hydrogen Transfer from the Cyclopentadienyl RingInorganic Chemistry Inorg. Chem. 19832220 INORG CHEMISI:A1983RJ805000442,Samuel, E., Guery, D., Vedel, J., Basile, F. 1985f`Electrochemical reduction of zirconene dihalides and dialkyls studies by electron spin resonanceOrganometallicse4* 1073-1077*B7Dohmeier, C. Baum, E. Ecker, A. Koppe, R. Schnockel, H..(Pentabenzylcyclopentadienides of lithiumOrganometallics CRYSTAL-STRUCTURE; LITHOCENE ANION; COMPOUND; METALLOCENE; COMPLEXES; CYCLOPENTADIENIDE; TETRAHYDROFURAN; SUPERSANDWICH; LIGANDS; ALKALI(Pentabenzylcyclopentadienyl)lithium (Li(eta(5)-C(5)Bz(5))) has been prepared by lithiation of pentabenzylcyclopentadiene with tert-butyllithium in toluene or benzene. This compound, which is the nonisolated starting material for most of the known pentabenzylcyclopentadienides, has been characterized by NMR and mass spectroscopy. The molecular structure of the benzene adduct of dimeric Li(eta(5)-C(5)Bz(5)) has been determined by X-ray diffraction studies. A triple-decker-like structure, (eta(5)-C(5)Bz(5))Li(eta(5)-C(5)Bz(5))Li(eta(2)-C6H6), results. The reaction of Li(eta(5)-C(5)Bz(5)) with Al(eta(5)-C(5)Me(5)) leads to Al(eta(5)-C(5)Bz(5)) and Li(eta(5)-C(5)Me(5)), with [Li(eta(5)-C(5)Bz(5))(2)][Al(eta(5)-C(5)Me(5))(2)] as a side product. The molecular structure of the last-named compound consists of the separated sandwich ions [Li(eta(5)- C(5)Bz(5))(2)](-) and [Al(eta(5)-C(5)Me(5))(2)](+).Organometallics 19961522OCT 29 ORGANOMETALLICSISI:A1996VR12400012 4095-4103n6/Dreier, T. Erker, G. Frohlich, R. Wibbeling, B.,zt2-hetaryl-substituted bis(indenyl)zirconium complexes as catalyst precursors for elastomeric polypropylene formationOrganometallicsMETALLOCENE ZIEGLER-CATALYST; X-RAY-DIFFRACTION; PROPYLENE POLYMERIZATION; TORSIONAL ISOMERISM; MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; SOLID-STATE; METAL; DERIVATIVES; CHEMISTRY2-Indanone was treated with 2-lithio-5-methylfuran and the addition product dehydrated to yield the 2-(5'-methyl-2'- furyl)-substituted indene 2. Deprotonation with n-butyllithium followed by transmetalation to zirconium gave the bis(2- furylindenyl)ZrCl2 complex 4a. Sub sequent reaction with methyllithium yielded the corresponding bis(8- furylindenyl)ZrMe2 system 6a. The related bis[2-(5'-methyl-2'- furyl)indenyl]hafnium complexes (5a, 7a) and the bis[2-(5'- methyl-2'-thienyl)indenyl]zirconium and -hafnium complexes 4b- 6b were synthesized analogously. In the crystal the bis(2- furylindenyl)ZrCl2 (4a) and -HfCl2 (5a) complexes exhibit meso- like metallocene conformations, as shown by X-ray diffraction. In contrast, the bis(2-furylindenyl)ZrMe2 system (6a) shows a chiral, close to Ca-symmetric rac-like metallocene conformation in the solid state. Hydrolysis of 2-(5'-methyl-2'-furyl)indene (2a) followed by Paal-Knorr pyrrole synthesis of the resulting 1,4-diketone 8 with methylamine gave (5'-methyl-2'-N- methylpyrrolyl)indene (9), which was deprotonated and transmetalated to yield the substituted bis(2- pyrrolylindenyl)ZrCl2 (11), -HfCl2 (12), and -ZrMe2 (13) complexes. Treatment of the [2-(5'-methyl-2'-furyl)indenyl]- and [2-(5'-methyl-2'-thienyl)indenyl]ZrCl2 systems 4a,b with excess methylalumoxane gave active homogeneous Ziegler catalysts for the production of elastomeric polypropylene. The catalyst derived from 11 yielded only propene oligomers.Organometallics 20001920OCT 2 ORGANOMETALLICS1ISI:000089761500014143-148@9Dreier, T. Unger, G. Erker, G. Wibbeling, B. Frohlich, R.rGroup 4 metallocenes containing hetaryl substituents at their pi-ligands: synthesis and characterization of the parent bis[2- (2-furyl)indenyl]zirconocene system*#Journal of Organometallic Chemistry zirconocene complexes; homogeneous Ziegler-Natta catalysis; elastomeric polypropylene; metallocene conformation ELASTOMERIC POLYPROPYLENE; PROPYLENE POLYMERIZATION; CATALYST PRECURSORS; COMPLEXES; METAL; STEREOSPECIFICITY; POLY(PROPYLENE); CHEMISTRYe2-Lithiofuran was added to 2-indanone to yield 2-(2- furyl)indene (4) after hydrolytic workup. Treatment of 4 with n-butyl-lithium gave 2-(2-furyl)indenyllithium (5). Subsequent reaction of 5 with 0.5 molar equivalents of zirconium tetrachloride in toluene yielded bis[2-(2- furyl)indenyl]zirconium dichloride (6) that was characterized by X-ray diffraction. The homogeneous 6-methylalumoxane Ziegler-Natta catalyst produced elastomeric polypropylene. (C) 2001 Elsevier Science B.V. All rights reserved.J. Organomet. Chem. 2001 622 1-2MAR 15 J ORGANOMET CHEMISI:000167609900018 4995-5005NBLϛg?A&&sxȫVЎ)@y@Ӝ– aj@iὸ;Jht帏WSHpvn'ݜcZ"T<.hՏhHO)ڹ&Mg_P7[Z7 ӽP9:rͻhe0R8Tcs+<.0)iNgAwh+%*6TkVٵ0v߹m\__WY> 4'%G R8bf[MTn-'f≯|.B+Q46`O&"@ϖfv:[Cʁ&RNlǒty)L rWFI 0cRNlk((B 17-25P^WCano, A. Cuenca, T. Galakhov, M. Rodriguez, G. M. Royo, P. Cardin, C. J. Convery, M. A.I:4Fulvalene Titanium and Zirconium Complexes - Synthesis and Nmr- Study of Phosphanido-Derivatives, Alkyl-Derivatives, and Alkynyl-Derivatives - X-Ray Crystal-Structures of [(Ti(Eta(5)- C5h5)(Mu-Pph(2)))(2)(Mu-(Eta(5)-C5h4-Eta(5)-C5h4))] and [(Zr(Eta(5)-C5h5)(Mu-C-Csume(3)))(2)(Mu-(Eta(5)-C5h4-Eta(5)- C5h4))]*#Journal of Organometallic ChemistryJ. Organomet. Chem.a 1995 493 1-2j MAY 17 J ORGANOMETAL CHEMISI:A1995QX75300003227-235.>7Cano, A. Cuenca, T. GomezSal, P. Manzanero, A. Royo, P. Dicyclopentadienyl titanium and zirconium complexes with the double bridged bis(dimethylsilanodiyl) dicyclopentadienyl [(Me(2)Si)(2)(eta(5)-C5H3)(2)](2-) ligand: X-ray molecular structure of [Ti{(SiMe(2))(2)(eta(5)-C5H3)(2)}Me(2)]*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1996 5262 DEC 27 J ORGANOMETAL CHEMISI:A1996WB284000030)Cardin, D.J. Lappert, M. F. Raston, C. L.( 1986:4Chemistry of Organo-Zirconium and -Hafnium Compounds West Sussex, England Ellis Horwood LTDa 0-85312-475-2e81Organohalfium compounds, organozirconium compound 2668-2668tD>Carpenetti, D. W. Kloppenburg, L. Kupec, J. T. Petersen, J. L. Application of amine elimination for the efficient preparation of electrophilic ansa-monocyclopentadienyl group 4 complexes containing an appended amido functionality. Structural characterization of [(C5H4)SiMe(2)(n-t-Bu)]ZrCl2(NMe(2)H) (vol 15, pg 1573, 1996)OrganometallicsOrganometallics, 19961511MAY 28 ORGANOMETALLICSISI:A1996UN67700018 1572-1581tD>Carpenetti, D. W. Kloppenburg, L. Kupec, J. T. Petersen, J. L.Application of amine elimination for the efficient preparation of electrophilic ansa-monocyclopentadienyl group 4 complexes containing an appended amido functionality. Structural characterization of [(C5H4) SiMe(2)(N-t-Bu)] ZrCl2 (NMe(2)H)jOrganometallicsOrganometallics 1996156nMAR 19 ORGANOMETALLICSISI:A1996UB30700009P900-90660Casarin, M. Ciliberto, E. Gulino, A. Fragala, I.An Investigation of the Electronic-Structure of Bis(Eta-5- Cyclopentadienyl) Dicarbonyl Complexes of Titanium(Ii) and Zirconium(Ii) - Discrete Variational X-Alpha Calculation and Gas-Phase Photoelectron-SpectroscopyOrganometallicsOrganometallics 198984APR ORGANOMETALLICSISI:A1989U095300007 5457-5469K>7Caselli, A. Giannini, L. Solari, E. Floriani, C. Re, N.TZirconium-butadiene bonded over a planar set of oxygens derived from calix[4]arene and its behavior as a source of zirconium(II)OrganometallicsiOrganometallicsO 19971625DEC 9 ORGANOMETALLICSEISI:A1997YK90100012 3652-3670n\VCaselli, A. Solari, E. Scopelliti, R. Floriani, C. Re, N. Rizzoli, C. Chiesi-Villa, A.Dinitrogen rearranging over a metal-oxo surface and cleaving to nitride: From the end-on to the side-on bonding mode, to the stepwise cleavage of the N N bonds assisted by Nb-III- calix[4]arene.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 2000 12215APR 19 J AMER CHEM SOCISI:000086729500011 3970-3977$Casey, C. P. Carpenetti, D. W.~wMeasurement of barriers for alkene dissociation and for inversion at zirconium in a d(0) zirconium-alkyl-alkene complexOrganometallicscOrganometallicsc 20001919SEP 18 ORGANOMETALLICSISI:0000893936000300 12958-12959f2,Cassani, M. C. Duncalf, D. J. Lappert, M. F.The first example of a crystalline subvalent organolanthanum complex: [K([18]crown-6)-(eta(2)-C6H6)(2)][(LaCp2tt)(2)(mu- eta(6):eta(6)-C6H6)]center dot 2C(6)H(6) (Cp-tt = eta(5)- C5H3Bu2t-1,3).(Journal of the American Chemical SocietyJ. Am. Chem. Soc.5 1998 120349DEC 16 J AMER CHEM SOCISI:000077610100030S 5539-5547rNGCassani, M. C. Gun'ko, Y. K. Hitchcock, P. B. Lappert, M. F. Laschi, F.t& Synthesis and characterization of organolanthanidocene(III) (Ln = La, Ce, Pr, Nd) complexes containing the 1,4-cyclohexa-2,5- dienyl ligand (benzene 1,4-dianion): Structures of [K([18]- crown-6)][Ln{eta(5)-C5H3(SiMe3)(2)-1,3}(2)(C6H6)] [Cp '' = eta(5)-C5H3(SiMe3)(2)-1,3; Ln = La, Ce, Nd]OrganometallicsOrganometallics 19991826DEC 20 ORGANOMETALLICSISI:000084583900020NVC@ f 6317-6318 XQPellny, P. M. Burlakov, V. V. Arndt, P. Baumann, W. Spannenberg, A. Rosenthal, U.aReactions of hexatriynes with permethyltitanocene and - zirconocene complexes: First NMR observation of a metallocene sliding along a polyyne chain.(Journal of the American Chemical SocietyTNPOLYMERS; MACROCYCLES; EFFICIENT; LIGAND; TITANOCENE; CLEAVAGE; ALKYNES; ROUTEJ. Am. Chem. Soc. 2000 12226JUL 5 J AM CHEM SOCISI:000088126600035 1198-1200kZTPellny, P. M. Peulecke, N. Burlakov, V. V. Baumann, W. Spannenberg, A. Rosenthal, U.rlReactions of tetraalkynylsilanes (RC C)(4)Si (R = Ph, Bu-t, SiMe3) with titanocene and zirconocene complexesOrganometallicstC SINGLE BOND; BUILDING-BLOCKS; CYCLIC CUMULENE; ALKYNYL GROUPS; CLEAVAGE; MACROCYCLES; EFFICIENT; 1;3;5- TRIETHYNYLBENZENE; CONSTRUCTION; DENDRIMERScpjReactions of the branched tetraalkynylsilanes (RC=C)(4)Si (1a: R = Ph, 1b: (BU)-B-t, 1c: SiMe3) with the metallocene source Cp2Ti(eta(2)-Me3SiC=CSiM3) (2) led to complexes 4-6, and those of 1a with Cp2Zr(THF)(eta(2)-Me3SiC=CSiMe3) (3) to complex 7. These, via 2-fold migration and C-C coupling of the alkynyl groups, gave a; novel type of dinuclear carbon-rich spiro complexes, The conversions proved to be independent of the metals, the substituents R, and the stoichiometries employed All new complexes have been characterized spectroscopically. Additionally, an X-ray crystal structure analysis was performed for 7.Organometallicss 2000196rMAR 20 ORGANOMETALLICSISI:000086082900036  81-90B`YPellny, P. M. Kirchbauer, F. G. Burlakov, V. V. Baumann, W. Spannenberg, A. Rosenthal, U.AxrDifferent C-C coupling reactions of permethyltitanocene and permethylzirconocene with disubstituted 1,3-butadiynes"Chemistry-a European JournalC-C coupling; C-H activation; diynes; titanocene; zirconocene TO-TAIL DIMERIZATION; X-RAY; MOLECULAR-STRUCTURE; CYCLIC CUMULENE; H ACTIVATION; COMPLEXES; ZIRCONOCENE; TITANOCENE; ZIRCONIUM; TITANIUMHerein we describe different C-C coupling reactions of permethyltitanocene and -zirconocene with disubstituted 1,3- butadiynes. The outcomes of these reactions vary depending on the metals and the diyne substituents. The reduction of [Cp- 2*MCl2] (Cp* = C5Me5; M = Ti, Zr) with Mg in the presence of disubstituted butadiynes RC equivalent to C-C equivalent to CR' is suitable for the synthesis of different C-C coupling products of the diyne and the permethylmetallocenes, and provides a new method for the generation of functionalized pentamethyl-cyclopentadienyl derivatives. For M=Zr and R=R'=tBu, the reaction gives, by a twofold activation of one pentamethylcyclopentadienyl ligand, the complex [Cp*Zr{- C(=C=CHtBu)-CHtBu-CH2-eta(5)-C5Me3-CH2-}] (3), containing a fulvene ligand that is coupled to the modified substrate (allenic subunit). When using the analogous permethyltitanocene fragment "Cp-2*Ti", the reaction depends strongly on the substituents R and R'. The coupling product of the butadiyne with two methyl groups of one of the pentamethylcyclopentadienyl ring systems, [Cp*Ti{eta(5)-C5Me3- (CH2-CHR-eta(2)-C-2-CHR'-CH2)}], is obtained with R=R'=tBu (4) and R= tBu, R' = SiMe3 (5). In these complexes one pentamethylcyclopentadienyl ligand is annellated to an eight- membered ring with a C-C triple bond, which is coordinated to the titanium center. A different activation of both pentamethylcyclopentadienyl ligands is observed for R = R' = Me, resulting in the complex [{eta(5)-C5Me4(CH2)-}Ti{-C(=CHMe)- C(=CHMe)-CH2-eta(5)-C5Me4}] (6), which displays a fulvene as well as a butadienyl-substituted pentamethylcyclopentadienyl ligand. The influence exerted by the size of the metal is illustrated in the reaction of [Cp-2*ZrCl2] with MeC equivalent to C-C equivalent to CMe. Here the five-membered metallacyclocumulene complex [Cp-2*Zr(eta(4)-1,2,3,4-MeC4Me)] (7) is obtained. The reaction paths found for R = R' = Me are identical to those for merry described for R = R' = Ph. Chem.-Eur. J. 200061JAN CHEM-EUR JISI:000084648300009 3571-3575"Petersen, J. L. Egan, J. W.iDilute Single-Crystal Electron-Paramagnetic Resonance Study of (Eta-5-C5h4ch3)2nbcl2 - Observation of Cl Hyperfine Coupling with the Unpaired ElectronInorganic Chemistry Inorg. Chem. 19832224 INORG CHEMISI:A1983RR68700017959-962haPeulecke, N. Lefeber, C. Ohff, A. Baumann, W. Tillack, A. Kempe, R. Burlakov, V. V. Rosenthal, U.{ansa-Titanocene and -zirconocene eta(2)-alkyne complexes - Synthesis, spectral characteristics, and x-ray crystal structuredChemische Berichteansa-zirconocenes; ansa-titanocenes; alkyne complexes; pyridine ligands ADDITIONAL LIGANDS; PERMETHYLTITANOCENE; ORGANOZIRCONIUM; CYCLIZATION; CUMULENE; BONDarkThe reduction of the complex [(eta(5)-C5H4)-ansa-(eta(5)- C5H4)]TiCl2 With magnesium in the presence of Me(3)SiC(2- )SiMe(3) in THF at room temperature gives the ansa-titanocene alkyne complex [(eta(5)-C5H4)-ansa-(eta(5)-C5H4)]Ti(eta(2)- Me(3)SiC(2)-SiMe(3)) (ansa = Me(2)Si-O-SiMe(2), 1). The similar pyridine stabilized zirconium complexes could be obtained by analogous reactions and addition of pyridine: [(eta(5)-C5H4)- ansa-(eta(5)-C5H4)]Zr(L)(eta(2)-Me(3)SiC(2)SiMe(3)) (ansa = Me(2)Si-O-SiMe(2), L = pyridine: 2; ansa = SiMe(2), L = pyridine: 3). All complexes were characterized by spectroscopic methods. An X-ray structure determination of complex 3 was conducted, and the data were compared to those of the complexes rac-(EB-HI)Zr(L)(eta(2)-Me(3)SiC(2)SiMe(3)) [L = (S)-(-)- nicotine: 6, EBHI = ethylenebis(tetrahydroindenyl)] and Cp(2)Zr(py)(Me(3)SiC(2-)SiMe(3)).Chem. Berichte 1996 1298 AUG CHEM BERISI:A1996VA174000124.Pez, G.P. Putnik, C.F. Suib, S.L. Stucky, G.D. 1979J.Am.Chem.Soc. 101d 6933("Zr(III) hydride with naphthyl ring 1795-18010)Pflug, J. Erker, G. Kehr, G. Frohlich, R. ~wAddition and coupling reactions of zirconocene cation complexes that contain a pendant eta(2)-formaldiminium side chaint.'European Journal of Inorganic ChemistrynEur. J. Inorg. Chem. 20008MAUG EUR J INORG CHEMISI:000088396700017. b 2956-2967t4-Dahlmann, M. Erker, G. Frohlich, R. Meyer, O.Structural dichotomy in single-component Ziegler catalyst systems: Characterization of Zr center dot center dot center dot F and Zr center dot center dot center dot C-bonded structural types of group 4 metallocene [C4H6-B(C6F5)(3)] betainesOrganometallicsoMETAL CYCLOOCTATETRAENYL COMPLEXES; ZIRCONIUM-CARBON BOND; POLYMERIZATION CATALYSTS; OLEFIN POLYMERIZATION; MOLECULAR- STRUCTURE; ION-PAIR; SPECTROSCOPIC CHARACTERIZATION; COORDINATION CHEMISTRY; ZIRCONOCENE COMPLEXES; HAFNOCENE COMPLEXES The organometallic Lewis acid B(C6F5)(3) adds to the terminal =CH2 group of the (butadiene)metallocene complexes 5a and 5b to give the ansa-metallocene betaine systems [Me2Si- (C5H4)(2)]Zr[C4H6-B(C6F5)(3)] (6a) and [Me2Si(3-MeC5H3)(2)] Zr[C4H6-B(C6F5)(3)] (6b), respectively, in high yield. Both complexes were characterized by X-ray diffraction. They both contain a substituted eta(3)-allyl ligand F off configuration, and they show a characteristic (ortho aryl)-C-F ... Zr interaction that stabilizes the electron-deficient metal center inside the dipolar structure. B(C6F5)(3) also adds to one butadiene terminus of (s-cis-eta(4)-C4H6) [Me2C(C5H4)- (indenyl)]Zr to give a high yield of a single isomer of the respective ansa-metallocene [C4H6-B(C6F5)(3)] betaine complex 9. The X-ray crystal structure analysis of 9 has revealed that in this case a (Z)-eta(3)-allyl-CH2B(C6F5)(3) ligand is formed. This precluded the (aryl)C-F ... Zr coordination. Instead, the zirconium center in 9 forms a stabilizing internal ion pair interaction between the negatively polarized [B]-C(4)H-2 methylene group and the positive zirconium center. The analogously structured ansa-metallocene [(Z)-C4H6-B(C6F5)(3)] betaine complex 12 is obtained in high yield from B(C6F5)(3) addition to (s-cis-eta(4)-butadiene) [Me2C- (C5H4)(fluorenyl)]Zr. In solution the complexes 6, 9, and 12 exhibit structures that are analogous to those found in the solid state. However, treatment of (butadiene) [Me2Si(C5H4)(2)]-Zr (5a) with B(C6F5)(3) under kinetic control (233 K in toluene-d(8)) quantitatively yields the [Me2Si(C5H4)(2)] Zr [(Z)-C4H6-B(C6F5)(3)] betaine isomer 13, which contains the stabilizing [B]-C(4)H-2... Zr internal ion pair interaction. Subsequent thermally induced rearrangement of the kinetic product 13 (Delta G(rearr)(not equal)(298 K) = 21.5 +/- 0.5 kcal mol(-1)) then results in the formation of the eventually observed thermodynamic ansa-metallocene betaine product 6a, that contains the (E)-C4H6-B(C6F5)(3) ligand and exhibits internal (aryl)C-F ... Zr coordination. A similar reaction sequence was observed during the addition of B(C6F5)(3) to the parent (butadiene)zirconocene system 1: at 213 K the kinetic Cp2Zr[(Z)-(1-3 eta),kappa C-4-C4H6- B(C6F5)(3)] betaine product 14 is formed, which rapidly rearranges at temperatures above 253 K to yield the previously observed stable Cp2Zr[(E)-C4H6-B(C6F5)(3)] betaine system 2, which is characterized by an internal C-F ... Zr bond. The ansa-metallocene betaines 6, 9, and 12 are all active homogeneous single-component Ziegler catalysts for ethene and propene polymerization. They are similarly effective as the usually employed ansa-metallocene dichloride/methylalumoxane catalyst systems.Organometallics 20001916AUG 7 ORGANOMETALLICSISI:000088605400006 1909-1910 2+Daniele, S. Hitchcock, P. B. Lappert, M. F.tnmeta- and para-bis[zirconyl(IV)amino]cyclophanes; 1,3- or 1,4- C6H4[(N)over-bar(SiMe3)](2) as bridging ligandsChemical Communicationsr Chem. Commun.t 199918SEP 21 CHEM COMMUNISI:000082585000065M 7 Blackburn, D. W. Blandy, C. Blaurock, S.Blosser, P. W. Bo, C. Boccia, A. C. Bochmann, M. Boese, R. Bolm, C.Bonitatebus, P. J. Bonomo, L. Borzov, M. V. Bouquet, G.Bousquet, R. R. Boyle, T. J.Brackemeyer, T.Braddockwilking, J. Brady, F. J. Brady, J. C. Brait, A. Brammer, L. Brandsma, L. Braun, M.Braunwarth, W.Bravaya, N. M. Breen, T. L.Bridgewater, B. M.Brintzinger, H. H.Bristow, G. S.Britovsek, G. J. P. Britto, M. L. Broyer, J. P. Bruser, W. Bu, W. M. Bu, X. H. Buchholz, D. Buono, G.Burkalov, V. V. Burlakov, V.Burlakov, V. V. Buschmann, R. Bush, M. A.Butakoff, K. A.Butakoff, K.A. Bynum, R. V. Bzowej, E. I. C.L.RastonC.L.Raston, A.H.White Cacciola, J.Calderazzo, F. Caldes, M. T.Campana, C. F.Campbell, C. L.Campbell, G. K. Cano, A. Cardin, C. Cardin, C. J. Cardin, D. J. Cardin, D.J.Carpenetti, D. W.Carrillo-Hermosilla, F. Carter, A. Carty, A. J. Cary, D. R. Casarin, M. Caselli, A. Casey, C. P.Cassani, M. C. Cassoux, P.Castellano, B.Caulton, K. G.Cederbaum, F. E. Cejka, J.Chadwick, A. V. Chang, F. C.Chatakondu, K.Chatterjee, S. K.Chattopadhyay, S. K. Chen, B. Chen, C. T. Chen, C. X. Chen, L. F. Chen, L. H. Chen, Z. L. Cheng, H. Cheng, X. Chernega, A.Chernega, A. N. Chi, K. M. Chi, Y. Chiang, A. P. Chiang, M. Y.Chien, J. C. W.Chiesi-Villa, A.Chiesivilla, A. Ching, W. L. Chirik, P. J. Choueiry, D. Choukroun, R. Chu, K. J. Chu, P. P. J.Churakov, A. V. Ciliberto, E. Ciruelo, G. Ciruelos, S. Cisarova, I. Clase, H. J. Clauss, D. A. Cleary, B. P. Clegg, W.Cloke, F. G. N.Coalter, J. N.Cochran, F. V. Cohen, J. D. Cole, A. P. Collins, S. Colomb, E.Constantine, S. P.Constantine, S.P.Convery, M. A. Cook, L. M. Corey, J. Y. Corker, J.Corradi, M. M.Corrochano, A.Corrochano, A. E. Cotter, W. D. Cotton, F. A. Courtot, P.Coville, N. J. Cox, H. Cox, K. P. Crescenzi, R.Cristofolini, L. Crouse, K. A. Crowte, R. J. Cruz, V. Cuenca, T. Curtis, M. A. D'Attoma, M.\YD.L.Greene, O. A. Villalta D. M. Macias A. Gonzalez W. Tikkanen B. Schick K. KantardjieffLFD.P.Krut'ko, M. V. Borzov E. N. Veksler A. V. Churakov J. A. K. HowardjY Dahan, F. Dahlmann, M. Dalby, C. I. Dall'Occo, T. Damo, S. Daniele, S. Daturi, M. Davis, M. E. Davis, W. M. Dawson, D. M. Day, C. S. Day, M. W. Day, R. O.de Boer, J. L. de Jesus, E.de Koning, C. B.de la Mata, F. J. Deboer, J. L. Deck, P. A.Deckers, P. J. W.Deelman, B. J. Dehnicke, S. Dekock, R. L. Dekura, F. DeLima, G. M.Della Bona, M. A.Della Sala, G.Delvilledesbois, M. H.Demerseman, B. Demsar, A. Denisov, V. Denner, C. E. Destro, M.Devereux, M. M. Di Bella, S.Diamond, G. M. DiBella, S. Dick, D. G.Diebold, M. P. Dietrich, W. Ding, Y. W.Dinnebier, R. E. Dobbs, D. A.Dockter, D. W. Dodge, T. n<d:PJ"%F&, 17-66n Harder, S.D=Recent developments in cyclopentadienyl-alkalimetal chemistryi$Coordination Chemistry Reviews cyclopentadienyl; alkalimetal; sandwich compounds MAIN-GROUP ELEMENTS; ARSENIC-BRIDGED <1>FERROCENOPHANES; RAY CRYSTAL-STRUCTURES; LITHIUM COMPLEXES; SOLID-STATE; SIMPLEST METALLOCENE; ARYL COMPOUNDS; METAL ALKYL; ORGANOMETALLIC COMPOUNDS; ABINITIO CALCULATIONS<6Cyclopentadienyl-alkalimetal compounds are among the first organometallic compounds prepared. Their structures have been well studied and generally show unsolvated or solvated polymer chains or solvated monomers. During the last few years there have been some interesting developments in the structural chemistry of this compound class; structures of oligomeric species and anionic metallocene sandwich complexes have been reported. This work discusses bonding in Cp-alkalimetal compounds and summarizes selected structural data of all Cp- alkalimetal compounds published up to September 1997 including our own unpublished results (the indenyl, fluorenyl and higher delocalized systems have been excluded deliberately and are only mentioned occasionally for comparison). (C) 1998 Elsevier Science S.A. All rights reserved.Coord. Chem. Rev. 1998 176SEP COORD CHEM REVISI:000077928900002 1808-1810.& Harder, S. Lutz, M. Obert, S. J.jcCrystal structure of a silicon-bridged anionic sodocene complex: Evidence for alkene-Na+ pi-bondingOrganometallics:4ALKALI-METAL; <1>FERROCENOPHANES; SANDWICH; POLYMERSThe (allyl)(2)Si-bridged Cp2Na onion crystallizes as a polymeric chain structure in which Na cations bridge [(allyl)(2)Si(C5H4)(2)](2-) units. One of the allyl substituents of the Si bridge shows alkene-Na+ pi-bonding interactions.sOrganometallicsl 1999189sAPR 26 ORGANOMETALLICSISI:000080072500038i331-334. Harder, S.ZTRecent developments in cyclopentadienyl-alkalimetal chemistry (vol 176, pg 17, 1998)$Coordination Chemistry Reviews SOLID-STATE; METALLOCENESCoord. Chem. Rev. 2000 199APR COORD CHEM REVISI:000086947800007t 1044-1046$Harder, S. Feil, F. Weeber, A.haStructure of a benzylcalcium diastereomer: An initiator for the anionic polymerization of styreneOrganometallics60CHIRAL ORGANOMETALLIC REAGENTS; BENZYL COMPLEXESA new dibenzylcalcium compound with chiral anionic centers has been prepared and was structurally characterized. The compound, which shows slow inversion of the chiral carbanions, is an active,initiator for the living polymerization of styrene.Organometallics 2001206MAR 19 ORGANOMETALLICSISI:000167628900005 4159-4168t0*Hardesty, J. H. Albright, T. A. Kahlal, S.Theoretical investigation of electrocyclic ring closure reactions in bis(aryloxy)bis(eta(2)-iminoacyl)zirconium and isoelectronic complexes Organometallics4OrganometallicsP 20001920OCT 2 ORGANOMETALLICSISI:0000897615000219 2365-2372B;Harlan, C. J. Tunge, J. A. Bridgewater, B. M. Norton, J. R.D=Trapping of acetylene by a zirconocene terminal imido complexOrganometallicsOrganometallics. 20001912JUN 12 ORGANOMETALLICSISI:000087638800019E,&Harvey, M. J., Hanusa, T. P., Pink, M. 2001hbStructural characterization of the columnar alkali metal cyclopentadienide [K{C5H2(SiMe3)3-1,2,4}]:3Journal of the Chemical Society-Dalton Transactions0 1128-11300373-374. Haussuhl, E.Crystal structure of rubidium guanidinium zirconium bis(nitrilotriacetate) dihydrate, Rb(C(NH2)(3))Zr(N(CH2COO)(3))(2)center dot 2H(2)O>7Zeitschrift Fur Kristallographie-New Crystal StructuresS"Z. Krist.-New Cryst. Struct. 2000 215H3SZ KRIST-NEW CRYST STRUCTISI:000088244800032M 1393-1399*$Heerdmann, A. Johrendt, D. Mewis, A.ZSPalladium pnictides of zirconium and hafnium with a metal : nonmetal ratio of 2 : 182Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem. 2000 626l6[JUN Z ANORG ALLG CHEM2ISI:000087840500023697-699.:3Herrmann, W. A. Cuenca, T. Menjon, B. Herdtweck, E.xqChemistry of Oxophilic Transition-Metals .3. Dinuclear Fulvalene Complexes of Trivalent and Tetravalent Zirconium82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.s 1987267JUL ANGEW CHEM INT EDISI:A1987J644200030E@f4),Chemdexmhttp://www.chemdex.org Web Element http://www.webelement.org/2+Abel, E. W., Stone, F. G. A., Wilkinson, G.o 19950)Comprehensive Organometallic Chemistry II- Lappert, M. F.F@Scandium, Yttrium, Lanthanides and Actinides, and titanium group Elsevier Science Ltd. Vol 41280-286xqAgarkov, A. Y. Izmer, V. V. Riabov, A. N. Kuz'mina, L. G. Howard, J. A. K. Beletskaya, I. P. Voskoboynikov, A. Z.oSynthesis and X-ray crystal structures of ansa-complexes of titanium, zirconium, and hafnium involving methylene- bis(indenyl) ligando*#Journal of Organometallic Chemistry;ansa-metallocenes; titanium; zirconium; hafnium; tin METALLOCENE DERIVATIVES; CHIRAL TITANOCENE; TRANSMETALATION; POLYMERIZATION; ROUTESynthesis of bis(indenyl)methane and the corresponding ansa- complexes of titanium(IV), zirconium(IV), and hafnium(IV) was performed. Mixtures of rac- and meso-methylene- bis(indenyl)zirconium and -hafnium dichlorides were obtained under a treatment of the respective metal tetrachlorides with bis[3-(tri-n-butyltin)indenyl]methane in toluene. The complexes, rac-H2C(indenyl)(2)MCl2, were isolated in 27% (M = Zr) and 31% (M = Hf) yields using a simple work-up process. These zirconium and hafnium complexes were characterized by X- ray crystal structure analysis. Methylene- bis(indenyl)titanium(Iv) dichloride was prepared by two different pathways. The first one includes a treatment of TiCl4(THF)(2) with dilithium salt of bis(indenyl)methane in THF. This procedure gives rac-H2C(indenyl)(2)TiCl2 in 16% only. An alternative reaction involving a treatment of TiCl4 with bis[3-(tri-n-butyltin)indenyl]methane results in rac- H2C(indenyl)(2)TiCl2 with 38% yield. A treatment of rac- H2C(indenyl)(2)TiCl2 with two equivalents of MeLi in diethyl ether gives rac-H2C(indenyl)(2)TiMe2, which has been isolated in 64% yield, and characterized by X-ray crystal structure analysis. (C) 2001 Published by Elsevier Science B.V. All rights reserved.J. Organomet. Chem. 2001 619 1-2JAN 30 J ORGANOMET CHEMISI:000167014700032385-389.LFAhn, C. H. Tahara, M. Uozumi, T. Jin, J. Tsubaki, S. Sano, T. Soga, K.hbCopolymerization of 2-butene and ethylene with catalysts based on titanium and zirconium complexes*#Macromolecular Rapid CommunicationsVPMONOMER-ISOMERIZATION POLYMERIZATION; CHELATING DIAMIDE COMPLEXES; ALPHA-OLEFINS The polymerization of 2-butene and its copolymerization with ethylene have been investigated using four kinds of dichlorobis(beta-diketonato)titanium complexes, [ArN(CH2)(3)NAr]TiCl2 (Ar=2,6-(Pr2C6H3)-Pr-i) and typical metallocene catalysts. The obtained copolymers display lower melting points than those produced of homopolyethylene under the same polymerization conditions. C-13 NMR analysis indicates that 9.3 mol-% of 2-butene units were incorporated into the polymer chains with Ti(BFA)(2)Cl-2-MAO as the catalyst system. With the trans-2-butene a higher copolymerization rate was observed than with cis-2-butene. A highly regioselective catalyst system for propene polymerization, [ArN(CH2)(3)NAr]TiCl2 complex using a mixture of triisobutylaluminium and Ph3CB(C6F5)(4) as cocatalyst, was found to copolymerize a mixture of 1-butene and trans-2-butene with ethylene up to 3.1 mol-%. Monomer isomerization- polymerization proceeds with typical metallocene catalysts to produce copolymers consisting of ethylene and 1-butene.Macromol. Rapid Commun. 2000217"MAY 12 MACROMOL RAPID COMMUNISI:000087142700010nd hafnium with a metal : nonmetal ratio of 2 : 182Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem. 2000 626l6[JUN Z ANORG ALLG CHEM2ISI:000087840500023697-699.:3Herrmann, W. A. Cuenca, T. Menjon, B. Herdtweck, E.xqChemistry of Oxophilic Transition-Metals .3. Dinuclear Fulvalene Complexes of Trivalent and Tetravalent Zirconium82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.s 1987267JUL ANGEW CHEM INT EDISI:A1987J644200030E 2134-2141N.(Herrmann, W. A. Menjon, B. Herdtweck, E.Chemistry of Oxophilic Transition-Metals .4. Reactivity of the Organozirconium(Iii) Complex (Mu-Eta-5-Eta-5-C10h8)[(Mu- Cl)Zr(Eta-5-C5h5)]2 with Diphenyldiazomethane, Tert-Butyl Isocyanide, and Trimethylsilyl Azide - Diazo, Cyano, and Imido ComplexesOrganometallicsOrganometallics 1991107JUL ORGANOMETALLICSISI:A1991FW22000015 x<& ^$ ,%Lab657-665N"Green, M. L. H. Ishihara, N.}New Ansa-Metallocenes of the Group-4 Transition-Metals as Homogeneous Catalysts for the Polymerization of Propene and Styrenev:3Journal of the Chemical Society-Dalton Transactionsi"J. Chem. Soc.-Dalton Trans. 19945$MAR 7 J CHEM SOC DALTON TRANSAISI:A1994MZ41400007U 1049-1059 $Green, M. L. H. Popham, N. H.rjcSynthesis of heterobinuclear metallocenes containing bridging ansa-bis-eta-cyclopentadienyl ligands:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19997a$APR 7 J CHEM SOC DALTON TRANSoISI:000079915100007y115-116A*#Green, M. L. H. Sassmannshausen, J.D=Evidence for zirconocene dications in Kaminsky type catalystsChemical Communications Chem. Commun.m 19992lJAN 21 CHEM COMMUNISI:000078344000002o317-327 >7Green, J. C. Green, M. L. H. Taylor, G. C. Saunders, J.,81Studies on ansa-zirconocene-butadiene derivatives:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.t 20003J CHEM SOC DALTON TRANSeISI:0000849559000169d^Greene,D.L. Villalta, O. A. Macias, D. M. Gonzalez, A. Tikkanen,W. Schick, B. Kantardjieff,K. 1999>8(eta$5!-Pentaphenylcyclopentadienyl)-trichloro-zirconium("Inorganic Chemistry Communications2 311 GOTJII311-314MhaGreene, D. L. Villalta, O. A. Macias, D. M. Gonzalez, A. Tikkanen, W. Schick, B. Kantardijeff, K.Zirconocene complexes of the sterically demanding pentaphenylcyclopentadienyl ligand, Cp-PRO. Synthesis and characterization of (CpZrCl3)-Zr-PRO and (CpCpZrCl2)-Zr-PRO (Cp = eta(5)-C5H5; Cp-PRO = eta(5)-C-5(C6H5)(5))("Inorganic Chemistry CommunicationsInorg. Chem. Commun. 199927 JUL INORG CHEM COMMUNISI:000081448300012a112-127NGGrimmer, N. E. Coville, N. J. de Koning, C. B. Smith, J. M. Cook, L. M.Zirconium bis-indenyl compounds. Synthesis and X-ray crystallography study of 1-and 2-substituted bis(R- indenyl)zirconium dichloride metallocenes*#Journal of Organometallic Chemistryozirconium; indenyl; metallocene complexes ELASTOMERIC POLYPROPYLENE; POLYMERIZATION CATALYSIS; PROPYLENE POLYMERIZATION; PROPENE POLYMERIZATION; OLEFIN POLYMERIZATION; TORSIONAL ISOMERISM; COMPLEXES; STEREOSPECIFICITY; DERIVATIVES; PRECURSORSA series of 1- and 2-substituted indenyl ligands were prepared and used in the synthesis of [1-R-Ind](2)ZrCl2 [R = Me (2b), Et (4b), Pr-i (5b), Bu-i (6b), SiMe3 (8b), Ph (10b), Bz (12b), 1- Naph (14b)] and [2-R-Ind](2)ZrCl2 [R = Me (1b), Et (3b), SiMe3 (7b), Ph (9b), Bz (11b), 1-Naph (13b)] metallocenes. An X-ray crystallographic study of 4b and 10b showed the complexes to be the racemic diastereomers (4b, both the R,R and S,S-enantiomers and 10b, the S,S-enantiomer). The X-ray data together with NMR spectral data revealed that the size of the substituent influenced the orientation the two indenyl ligands of the metallocenes. The 4b diastereomers are both found to crystallize with their ethyl groups syn (bis-central) with respect to each other whereas the larger phenyl groups in 10b results in an anti (bis-lateral) orientation of the indenyl ligands. (C) 2000 Elsevier Science B.V. All rights reserved.J. Organomet. Chem. 2000 616 1-2DEC 15 J ORGANOMET CHEMeISI:000166128700014n 2832-2834(4-Gun'ko, Y. K. Hitchcock, P. B. Lappert, M. F.( Nonclassical organolanthanoid metal chemistry: [K([18]-crown- 6)(eta(2)-PhMe)(2)]X (X = [(LnCp(3)(t))(2)(mu-H)], [(LnCp ''(2))(2)(mu-eta(6):eta(6)-PhMe)]) from [LnCp(3)(x)], K, and [18]-crown-6 in toluene (Ln = La, Ce; Cp-t = eta(5)- C5H4SiMe2But; Cp '' = eta(5)-C5H3(SiMe3)(2)-1,3)OrganometallicsOrganometallics  20001915JUL 24 ORGANOMETALLICSISI:000088374300004 4017-4022rD>Guzei, I. A. LiableSands, L. M. Rheingold, A. L. Winter, C. H.leSynthesis and characterization of titanium and zirconium complexes bearing diphenyltriazenido ligandsr Polyhedron Polyhedron 19971623 POLYHEDRONISI:A1997YA55800010207-213.@9Gyepes, R. Witte, P. T. Horacek, M. Cisarova, I. Mach, K.iCrystal structures of titanocene 2,2 '-bipyridyl complexes. Singlet versus triplet state dependence on methyl substituents at the cyclopentadienyl ligands*#Journal of Organometallic Chemistry9J. Organomet. Chem. 1998 551 1-20 JAN 30 J ORGANOMETAL CHEM0ISI:000073410100023  1814-1821n<5Hagenau, U. Heck, J. Kaminsky, W. Schauwienold, A. M.aHBZr-IV and Ta-V complexes with methane-bridged bis(aryloxy) ligands82Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem. 2000 626a8tAUG Z ANORG ALLG CHEMiISI:000088768100023a 1966-1971l(!Hakala, K. Helaja, T. Lofgren, B.nzsMetallocene/methylaluminoxane-catalyzed copolymerizations of oxygen-functionalized long-chain olefins with ethylenea:3Journal of Polymer Science Part a-Polymer Chemistry functionalized polyolefin; ethylene copolymer; metallocene catalyst; methylaluminoxane; oxygen-functional comonomer ZIEGLER-NATTA POLYMERIZATION; POLAR VINYL COMONOMERS; ALPHA- OLEFINS; POLYETHYLENE; PROPENE; ETHENE; POLYOLEFINS; COMPLEXES; PROPYLENE; MONOMERSCopolymerizations of ethylene with 10-undecen-1-ol, 10- undecenyl methyl ether, 10-undecenyl trimethyl silyl ether, and 1-undecene were performed with rac-ethylene-bis(l- indenyl)zirconium dichloride as a catalyst and methylaluminoxane as a cocatalyst. All three oxygen-functional comonomers copolymerized with ethylene, although the activity of the catalyst decreased considerably compared with the homopolymerization of ethylene. The conversions of the comonomers varied from 17 to 40%, depending on the amount of comonomer in the feed. Under the same conditions, the conversion of 1-undecene was 50-75%. The incorporation (0.7-3.6 mol %, depending on the feed) and the effect on the activity of the catalyst were on the same level for all the functional comonomers, which indicates that trimethylsilyl or methyl groups do not act as effective protecting groups for oxygen atoms. According to NMR and Fourier transform infrared analyses, the final functional group in the copolymers of the trimethylsilyl ether comonomer was hydroxyl. In contrast, the methyl ether group remained untouched in the copolymer, which suggests that the formation of aluminum alkoxides via a reaction with a cocatalyst is not a prerequisite for comonomer incorporation. (C) 2000 John Wiley & Sons, Inc. J. Polym. Sci. Pol. Chem. 20003811$JUN 1 J POLYM SCI A-POLYM CHEMISI:000086983600005 bo 0261-274.*$Licht, E. H. Alt, H. G. Karim, M. M.b[Synthesis, characterization and catalytic properties of metallacyclic zirconocene complexes*#Journal of Organometallic Chemistrymetallacycles; zirconocene complexes; CH activation; catalysis; ethylene polymerization M = ZR; OLEFIN POLYMERIZATION; CRYSTAL-STRUCTURE; SYNDIOTACTIC POLYPROPYLENE; METALLOCENE COMPLEXES; CYCLOPENTADIENYL RING; ZIRCONIUM; PROPYLENE; DERIVATIVES; BEHAVIORA series of 22 metallacyclic zirconocene complexes has been synthesized by the reaction of omega-phenyl-substituted zirconocene dichloride complexes with two equivalents of n- butyllithium via CH bond-activation reactions on the phenyl ring. After activation with methyl aluminoxane, these metallacycles are up to five times more active ethylene polymerization catalysts than the original metallocene dichloride complexes similarly activated. (C) 2000 Elsevier Science S.A. All rights reserved.J. Organomet. Chem. 2000 5992 APR 15 J ORGANOMETAL CHEMISI:000086737800022 65-72 Licht, E. H. Alt, H. G.apjMetallacyclic zirconocene complexes as catalysts for homogeneous and heterogeneous ethylene polymerization0)Journal of Molecular Catalysis a-Chemicalzirconium; metallacycles; catalysis; ethylene polymerization; heterogenization M = ZR; OLEFIN POLYMERIZATION; METALLOCENE CATALYSTS; SYNDIOTACTIC POLYPROPYLENE; CYCLOPENTADIENYL RING; CRYSTAL- STRUCTURES; ZIRCONIUM; PROPYLENE; COPOLYMERIZATION; BEHAVIORA novel class of heterogeneous ethylene polymerization catalysts, derived from homogeneous metallacyclic zirconocene complexes is described. These complexes can be activated with methyl aluminoxane (MAO) and used for ethylene polymerization. The polymerization reaction begins homogeneously, but the homogeneous metallacycles self-immobilize during the polymerization process. Subsequent olefin polymerization is therefore heterogeneously catalyzed. This method of heterogeneous olefin polymerization is compared with a homogeneous and an alternate heterogeneous polymerization technique. (C) 2000 Elsevier Science B.V. All rights reserved.J. Mol. Catal. A-Chem. 2000 154 1-2 MAR 20 J MOL CATAL A-CHEMISI:000086257200009 51-64c.(Linnolahti, M. Hirva, P. Pakkanen, T. A.XRGeometry prediction of bridged zirconocene dichlorides by quantum chemical methods("Journal of Computational ChemistryJDab initio calculations; Hartree-Fock; metallocenes; structure; zirconium ZIEGLER-NATTA CATALYSIS; INITIO MOLECULAR-DYNAMICS; HOMOGENEOUS OLEFIN POLYMERIZATION; COORDINATION GAP APERTURE; KAMINSKY-TYPE CATALYSTS; ETHYLENE POLYMERIZATION; METALLOCENE CATALYSTS; CHAIN TERMINATION; PROPYLENE POLYMERIZATION; INSERTION MECHANISMThe ab initio Hartree-Fock theory has been demonstrated to give accurate geometry predictions for bridged zirconocene dichlorides. Equilibrium geometries of crystallographically characterized bridged zirconocene dichlorides were optimized by Hartree-Fock, MP2, BLYP, and B3LYP methods, with basis sets ranging from 3-21G* to 6-311G**. Selected geometrical parameters were compared with experimental crystal structures. The least expensive HF/3-21G* method proved to be notably accurate. The accuracy of HF/3-21G* was verified by a comprehensive data set of 62 bridged zirconocene dichlorides. Furthermore, experimental corrections were applied to the optimized geometry parameters to eliminate systematic deviations. Corrections resulted in considerably improved accuracy for systematically overestimated metal-ligand distances, with maximum deviation falling from 0.081 to 0.039 Angstrom, and absolute average deviations from 0.048 to 0.012 Angstrom. Ligand-metal-ligand angles were predicted accurately with absolute average deviations of 0.7-1.3 degrees. Zirconium- chlorine distances and chlorine-zirconium-chlorine angles are relatively constant in the studied molecules. Zirconium- cyclopentadienyl distances can be influenced mainly by modifying the ligand structure, whereas cyclopentadienyl- zirconium-cyclopentadienyl angles and cyclopentadienyl- cyclopentadienyl plane angles can be controlled by bridge modifications. The HF/3-21G* method can be applied for the estimation of steric effects in zirconocene catalyzed polymerization reactions, therefore being suitable for the construction of structure-polymerization property correlations. (C) 2000 John Wiley & Sons, Inc.J. Comput. Chem. 2001221JAN 15 J COMPUT CHEMISI:000165929000005 2453-2458(!Liu, F. Q. Uson, I. Roesky, H. W. Synthesis and Structures of Cyclopentadienyl Fluoro and Chloro Complexes of a Triad (Ti, Zr, Hf) Containing Acyclic and Cyclic Siloxane Building-Blocksa:3Journal of the Chemical Society-Dalton TransactionsO"J. Chem. Soc.-Dalton Trans.O 199514$JUL 21 J CHEM SOC DALTON TRANSISI:A1995RL31000017 37-40I>8Llinas, G. H. Mena, M. Palacios, F. Royo, P. Serrano, R.(C5me5)Sime3 as a Mild and Effective Reagent for Transfer of the C5me5 Ring - an Improved Route to Monopentamethylcyclopentadienyl Trihalides of the Group-4 Elements*#Journal of Organometallic ChemistryJ. Organomet. Chem.P 1988 340D19FEB 9 J ORGANOMETAL CHEMISI:A1988L948800007: 1283-1288C<6Llinas, G. H. Day, R. O. Rausch, M. D. Chien, J. C. W.[Ethylidene(1-Eta-5-Tetramethylcyclopentadienyl)(1-Eta-5- Indenyl)]Dichlorozirconium - Synthesis, Molecular-Structure, and Polymerization CatalysisOrganometallicstOrganometallics 1993124TAPR ORGANOMETALLICS1ISI:A1993KX23300051 6$=CH& NJJ241-242d]Burlakov, V. V. Pellny, P. M. Arndt, P. Baumann, W. Spannenberg, A. Shur, V. B. Rosenthal, U.tmReactions of permethylmetallocene alkyne complexes of titanium and zirconium with tris(perfluorophenyl)boraneIChemical CommunicationsrZSREGIOSELECTIVE REACTIONS; TITANOCENE-ALKYNE; POLYMERIZATION; ZIRCONOCENE; ACETYLENEiPJFunctionalization of the pentamethylcyclopentadienyl ligands by an electrophilic substitution of hydrogen atoms by [B(C6F5)(3)] is observed at the Cp* ligands of the alkyne complexes [Cp*M- 2(eta(2)-PhC2SiMe3], connnected with (M = Ti, formation of 1) or without (M = Zr, formation of 2) loss of the alkyne and molecular hydrogen. Chem. Commun.d 20003, CHEM COMMUNeISI:000084993100031oBush, M. A. Sim, G. A. 1971Di-iodo-bis(pi-cyclopentadienyl) zirconium(iv) (eta$5!-Cyclopentadienyl)-chloro-(3,4-dimethylhexa-2,4-dien-2,5-diyl)-(1,2-bis(da J.Chem.Soc.A 2225 IDCPZR489-499 VOButakoff, K. A. Lemenovskii, D. A. Mountford, P. Kuzmina, L. G. Churakov, A. V.|vNew titanium and zirconium sandwich and half-sandwich complexes containing the C(5)Me(4)CH(2)CH(2)CH=CH2(Cp(=)) ligand Polyhedron Polyhedron 1996153FEB POLYHEDRONISI:A1996TG44100019RLButakoff,K.A. Lemenovskii,D. A. Mountford,P. Kuz'mina,L. G. Churakov,A. V. 1996VP2,4,6-Trimethylpyridinium tris(mu!2$-fluoro)-bis((eta$5!-pentamethyl-cyclopentad Polyhedron15 489r ZOJVAV665-6720)Cacciola, J. Reddy, K. P. Petersen, J. L.Synthesis, Reactivity, and Structural Characterization of the Dinuclear Zirconocenophane Complexes [Sime2(C5h4)2][(C5h5)Zr(Mu-X)]2 (X = S, Cl)OrganometallicsOrganometallics 1992112FEB ORGANOMETALLICSISI:A1992HE29800026 1813-1818t2,Calderazzo, F. Pallavicini, P. Pampaloni, G.82Arene Derivatives of Zirconium(Ii) and Hafnium(Ii):3Journal of the Chemical Society-Dalton TransactionsL"J. Chem. Soc.-Dalton Trans. 19906"JUN J CHEM SOC DALTON TRANS2ISI:A1990DJ25300011896-901HBCalderazzo, F. Pampaloni, G. Pallavicini, P. Strahle, J. Wurst, K.Reactions of Zr(Eta-6-Benzene)(Alcl4)2 with Alkynes - Cyclooligomerization Reactions and Crystal and Molecular- Structure of the 7-Membered Metallacycle [Zrcph(Cph)4cph][(Mu- Cl)2alcl2]2OrganometallicsaOrganometallics 1991104CAPR ORGANOMETALLICSFISI:A1991FG97600019O307-328R"Calderazzo, F. Pampaloni, G.HAOrganometallics of Groups-4 and 5 - Oxidation States-Ii and Lower-*#Journal of Organometallic ChemistryuJ. Organomet. Chem. 1992 4233 JAN 28 J ORGANOMETAL CHEM ISI:A1992HD11500001412-419M^XCalderazzo, F. Englert, U. Guarini, A. Marchetti, F. Pampaloni, G. Segre, A. Tripepi, G.Zirconium(II)- and hafnium(II)-assisted reductive coupling of coordinated carbonyl groups leading to ketenylidene complexes of zirconium(IV) and hafnium(IV)"Chemistry-a European Journal Chem.-Eur. J. 19962E4APR CHEM-EUR JISI:A1996UM038000078 2275-2277 NGCalderazzo, F. D'Attoma, M. Marchetti, F. Pampaloni, G. Troyanov, S. I.Labile adducts of TiCl4 with thionyl chloride structurally characterized at low temperature: a comparison with the zirconium and hafnium analogues, [MCl4(SOCl2)](2):3Journal of the Chemical Society-Dalton Transactionsi"J. Chem. Soc.-Dalton Trans.  199914J CHEM SOC DALTON TRANSISI:000081766200006r 51-57WJDCano, A. Cuenca, T. Rodriguez, G. Royo, P. Cardin, C. Wilcock, D. J.Fulvalene Cyclopentadienyl Titanium and Zirconium(Iii) and Zirconium(Iv) Complexes - X-Ray Crystal-Structure of [(Ti(Eta- 5-C5h5)Cl)2(Mu-O)(Mu-Eta-5-Eta-5-C10h8)]*#Journal of Organometallic ChemistryJ. Organomet. Chem.L 1993 44721 MAR 23 J ORGANOMETAL CHEMMISI:A1993KV11200008s}( VSnhErker,G. Sarter,C. Albrecht, M. Dehnicke,S. Kruger, C. Raabe, E. Schlund, R. Benn, R. Rufin, A. 1990NHTrichloro-(eta$5!-methylcyclopentadienyl)-bis(tetrahydrofuran)-zirconiumJ.Organomet.Chem., 382}89 VEHLIDhaErker,G. Schamberger, J. van der Zeijden,A. A. H. Dehnicke, S. Kruger, C. Goddard, R. Nolt, M.2 1993VOTetrafluoro-tetrakis(eta$5!-pentamethyl-cyclopentadienyl)-octakis(mu!2$-fluoro)J.Organomet.Chem. 459O 107 YEGBIV 1213-1215.82Erker, G. Noe, R. Wingbermuhle, D. Petersen, J. L.`ZC-H-Activation by Reaction of (Butadiene)Zirconocenes and (Butadiene)Hafnocenes with 9-Bbn82Angewandte Chemie-International Edition in English$Angew. Chem.-Int. Edit. Engl.9 1993328cAUG ANGEW CHEM INT ED.ISI:A1993LU338000404haErker, G. Schamberger, J. van der Zeijden, A. A. H. Dehnicke, S. Kruger, C. Goddard, R. Nolte, M.i 1993VPTrichloro-((1R,5R,8S,11S)-(eta$5!-1,5,14,14,15,15-hexamethylpentacyclo(9.2.1.1$5J.Organomet.Chem.m 4590 107 YAXKAJ Erker, G.r 1999XQUsing bent metallocenes for stabilizing unusual coordination geometries at carbonChemical Society Reviews28307-314309-317 Erker, G.6rkHomogeneous single-component betaine Ziegler-Natta catalysts derived from (butadiene)zirconocene precursors5$Accounts of Chemical ResearchsOLEFIN POLYMERIZATION CATALYST; ZIRCONIUM-CARBON BOND; CENTER- DOT-F; DIENE COMPLEXES; ETHYLENE POLYMERIZATION; METALLOCENE CATALYSTS; INSERTION REACTIONS; TRANSITION-METALS; STERIC CONTROL; LEWIS-ACIDe:4(Butadiene)zirconocene adds B(C6F5)(3) at a terminal diene carbon atom to yield the zirconocene-(mu -hydrocarbyl)-borate betaine Cp2Zr[C4H6-B(C6F5)(3)] (4). The dipolar complex 4 contains a distorted rr-allyl moiety and features an additional stabilizing Zr-F-C(arene) coordination. Under kinetic control, an isomeric betaine system is formed, characterized by an internal Zr+. . . CH2[B](-) ion-pair interaction, that rearranges to 4 upon heating. A great variety of ansa- metallocene(butadiene) complexes and related systems cleanly form analogous metallocene-(mu -conjugated diene)-borate betaines upon treatment with B(C6F5)(3) and related Lewis acids. Most of these systems represent very active homogeneous single component Ziegler-Natta catalysts for alpha -olefin polymerization and copolymerization. In addition, these betaine catalysts are ideally suited for carrying out mechanistic studies in active Ziegler-Natta catalyst systems. They allow for an experimental observation of the first alkene insertion step at the active single-component catalyst. This feature has been used for studying the mechanism of transfer of the stereochemical information from the bent metallocene backbone and for an experimental characterization of the energy profile of the alkene addition/alkene insertion reaction sequence in active homogeneous Ziegler-Natta systems. The neutral dipolar single-component catalysts (e.g., 4) produce a polyolefin- modified R'-(CHR-CH2)-C4H6-B(C6F5)(3)(-) counterion at the end of the initiation period upon entering into the repetitive active catalytic cycle.Accounts Chem. Res.O 20013440APR ACCOUNT CHEM RESISI:000168254500007e%j`Ddh 2503-2506 JDNegishi, E. Montchamp, J. L. Anastasia, L. Elizarov, A. Choueiry, D.Zirconium-catalyzed carboalumination of alkynes and enynes as a route to aluminacycles and their conversion to cyclic organic compoundsTetrahedron LettersngMETAL-PROMOTED CYCLIZATION; CONTROLLED CARBOMETALATION; ZIRCONOCENE DERIVATIVES; CARBONYLATION; ALKENES(!Aluminacyclopentenes, obtainable via Zr-catalyzed cyclic carboalumination with Et3Al and alkynes or enynes, can be converted to the corresponding cyclopentenones and alkenylcyclopropanes by treatment with CO2 and BrCH2OCH3, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.Tetrahedron Lett. 19983917APR 23 TETRAHEDRON LETTISI:000072999900017411-420o Negishi, E. voPrinciple of activation of electrophiles by electrophiles through dimeric association - Two are better than one"Chemistry-a European Journal\Ualuminum; dimerization; electron deficiency; Lewis acids; zirconium TRANSITION-METAL CATALYSIS; CARBON BOND FORMATION; BRIDGED TETRAHYDROINDENYL LIGANDS; ANSA-METALLOCENE DERIVATIVES; CP2ZR(H)CL SCHWARTZ REAGENT; CONTROLLED CARBOMETALATION; ORGANOZIRCONIUM COMPOUNDS; CASCADE CARBOALUMINATION; MONOSUBSTITUTED ALKENES; TITANOCENE DERIVATIVESZSElectron-deficient metal compounds can be significantly activated as electrophiles through dimeric (or polymeric) association with either the same or different electrophiles. Although this phenomenon has played an important role in many reactions, such as the Friedel - Crafts reaction and the Ziegler-Natta polymerization, it has apparently only recently been fully recognized. Its widespread exploitation promises to lead to many new synthetically useful reactions as well as ready and accurate interpretations of mechanistic and structural phenomena in acid-catalyzed and -promoted reactions. Chem.-Eur. J. 199952FEB CHEM-EUR JISI:000078555300002591-592 2,Negishi, E. Liou, S. Y. Xu, C. D. Huo, S. Q.A general method for the synthesis of E and/or Z oligoisoprenoids based on Pd-catalyzed homoallyl-alkenyl and homopropargyl-alkenyl cross coupling and Zr-catalyzed carboalumination Polyhedron Polyhedron 2000195iMAR 15 POLYHEDRON ISI:000086807500023 239-242 Negishi, E.Some newer aspects of organozirconium chemistry of relevance to organic synthesis. Zr-Catalyzed enantioselective carbometallation Pure and Applied ChemistryTRANSITION-METAL CATALYSIS; CARBON BOND FORMATION; CONTROLLED CARBOMETALATION; MONOSUBSTITUTED ALKENES; CONVENIENT PROCEDURE; ZIRCONIUM; ZIRCONOCENE; HYDROZIRCONATION; REAGENTS; ALKYNESXQThe reaction of terminal alkenes with trialkylalanes in the presence of chiral (NMI)(2)ZrCl2 has been shown to be 70-75% ee for methylalumination and 90-95% ee for ethyl- and higher alkylalumination. It must involve an acyclic bimetallic process. Its scope, limitations, and applications to some natural products syntheses are discussed.Pure Appl. Chem. 2001732FEB PURE APPL CHEMISI:00016869100000760Nielsen-Marsh, S., Crowte, R. J., Edwards, P. G. 1992 Chem. Commun.t 699@:Nifant'ev,I.E. Ivchenko,P. V. Bagrov,V. V. Kuz'mina,L. G. 1998VP(mu!2$-1-Methyl-(eta$5!-inden-1-yl)-4-(inden-1-yl)piperidine)-trichloro-triethylOrganometallics17 4734 HITJEZnpJ 2556-2563rNHKoch, T. Blaurock, S. Somoza, F. B. Voigt, A. Kirmse, R. Hey-Hawkins, E.<5Unexpected P-Si or P-C bond cleavage in the reaction of Li- 2[(C5Me4)SiMe2PR] (R = cyclohexyl, 2,4,6-Me3C6H2) and Li [(C5H4)CMe2PHR] (R = Ph, Bu-t) with ZrCl4 or [TiCl3(thf)(3)]: Formation and molecular structure of the ansa-metallocenes [{(eta-C5Me4)(2)SiMe2}ZrCl2] and [{(eta-C5H4)(2)CMe2}MCl2] (M = Ti, Zr)OrganometallicsOrganometallics 20001913JUN 26 ORGANOMETALLICSISI:000087804200026 9200-9204ab\Kokko, E. Lehmus, P. Leino, R. Luttikhedde, H. J. G. Ekholm, P. Nasman, J. H. Seppala, J. V.meso- and rac-diastereomers of 1- and 2-tert- butyldimethylsiloxy-substituted ethylenebis(indenyl)zirconium dichlorides for formation of short- and long-chain branched polyetheneMacromoleculesETHENE/PROPENE COPOLYMERIZATION; ALTERNATING COPOLYMERIZATION; METALLOCENE CATALYSTS; ETHENE POLYMERIZATION; ETHYLENE; POLYETHYLENE; HOMOPOLYMERIZATION; METHYLALUMINOXANE; BIS(INDENYL); ZIRCONOCENEEthene was homo- and copolymerized over the methylaluminoxane (MBO) activated meso-and rac-diastereomers of 1- and 2-tert- butyldimethylsiloxy-substituted ethylenebis(indenyl)zirconium dichlorides (meso-1, rac-1, meso-2, rac-2) at 40 degreesC in toluene. Homopolyethenes produced at low ethene concentration under slurry conditions revealed significantly modified melt rheological properties resulting from long-chain branching (LCB). In addition, a small amount of ethyl branching was found in polyethenes produced with meso-1, rac-1, and meso-2. The meso-catalysts were found to have an excellent comonomer response; in the copolymerization of ethene with 1-hexene r(E)(meso-1) = 10 +/- 1 and r(E)(meso-2) = 11 +/- 1. Comonomer reactivity ratios indicate a strong preference toward formation of isolated comonomer units in the polymer chain. Chain termination occurs preferentially after regular 1,2-insertion of the comonomer, although irregular 2,1-insertions also inflict some chain terminations with the racemic catalysts but not with the meso-catalysts. In ethene homopolymerization, chain transfer to monomer is the prevailing chain transfer mechanism for all studied catalysts and results in a high vinyl end group selectivity.Macromolecules 20003325DEC 12 MACROMOLECULES0ISI:000165830900010z376-388.BZj,+;4Mlv C9-C134.Courtot, P. Labed, V. Pichon, R. Salaun, J. Y.Preparation of the Complexes [(C5me4h)2mx2] (M = Ti, Zr and X = Cl, Alkyl, Aryl, Co) - Dynamic Nmr-Study of Steric Hindrance of the Rotation of Metal-Bonded Aromatic-Groups*#Journal of Organometallic ChemistryJ. Organomet. Chem.3 1989 359116JAN 3 J ORGANOMETAL CHEMISI:A1989R663500018661-672M6/Courtot, P. Pichon, R. Salaun, J. Y. Toupet, L.zElectronic and Steric Influence of the Tetramethylcyclopentadienyl Ligand on Physical-Properties and Reactivity of Titanium and Zirconium Complexes(>8Canadian Journal of Chemistry-Revue Canadienne De Chimie$Can. J. Chem.-Rev. Can. Chim.A 1991694APR CAN J CHEMISI:A1991FL97900013606-618APICrescenzi, R. Solari, E. Floriani, C. Re, N. Chiesi-Villa, A. Rizzoli, C.dMetal-porphyrinogen organometallic chemistry: The intramolecular reactivity of eta(2)-acyls bonded to titanium( IV)-meso-octaethyl mono(pyridine)-tris(pyrrole) and to vanadium(III)-meso-octaethyl bis(pyridine)-bis(pyrrole) macrocycleOrganometallicsOrganometallics 1999184FEB 15 ORGANOMETALLICSISI:000079156300019375-376 ZTCristofolini, L. Kordatos, K. Lawless, G. A. Prassides, K. Tanigaki, K. Waugh, M. P..'An elusive phase transition in Na2RbC60Chemical Communications Chem. Commun.S 19974eFEB 21 CHEM COMMUNISI:A1997WL185000209 61-67LCuenca, T. Royo, P.EztPreparation and Chemical Behavior of Halodicyclopentadienyl- Zirconium(Iii) and "Halodicyclopentadienyl-Hafnium(Iii)*#Journal of Organometallic Chemistry3J. Organomet. Chem.3 1985 293313J ORGANOMETAL CHEMISI:A1985ARM980000832,Cuenca, T., Herrmann, W. A., Ashworth, T. V. 1986f`Chemistry of oxophilic transition metals. 2. Novel derivatives of "titanocene" and "zirconocene"Organometallics)5a 2514-2516" 1229-1234yB;Cuenca, T. Gomez, R. Gomezsal, P. Rodriguez, G. M. Royo, P.LReactions of Titanium(Iii) and Zirconium(Iii) Complexes with Unsaturated Organic-Systems - X-Ray Structure of ([(Eta-5- C5h5)Zr(Ch3)]2[Mu-Eta-1-Eta-2-Cn(Me2c6h3)](Mu-Eta-5-Eta-5- C10h8))OrganometallicsOrganometallicsh 1992113MAR ORGANOMETALLICSNISI:A1992HH927000325848-854VXQCuenca, T. Padilla, A. Royo, P. Parrahake, M. Pellinghelli, M. A. Tiripicchio, A.Low Oxidation Dinuclear Titanium Complexes with the Bridging Mu-(Dimethylsilyl)Biscyclopentadienyl Ligand - Crystal- Structure of [(Ti(Eta(5)-C5h5))(2)(Mu-Cl)(2)(Mu- Me(2)Si(C5h4)(2))]Organometallics Organometallics9 1995142FEB ORGANOMETALLICSISI:A1995QG57700036e 93-96.(!Cuenca, T. Montejano, C. Royo, P.ZSSynthesis and characterization of tert-butylcyclopentadienyl derivatives of hafniumh*#Journal of Organometallic ChemistryJ. Organomet. Chem.i 1996 514a 1-2 MAY 17 J ORGANOMETAL CHEMISI:A1996UQ50400013 7986-7998c*$Dahlmann, M. Erker, G. Bergander, K.Experimental characterization of the alkene-addition/-insertion energy profile at homogeneous group 4 metal Ziegler-type catalysts.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 2000 122 33AUG 23 J AM CHEM SOCISI:000089082500015  1881-1886f`Dahlmann, M. Schottek, J. Frohlich, R. Kunz, D. Nissinen, M. Erker, G. Fink, G. Kleinschmidt, R.tmStructural characterization of M(s-cis-eta(4)- C4H6)(Me4C5SiMe2NR) (M = Ti or Zr, R = CMe3 or CHCMe(1-C10H7))r:3Journal of the Chemical Society-Dalton TransactionsU"J. Chem. Soc.-Dalton Trans.0 200012J CHEM SOC DALTON TRANS0ISI:000088758400015 1789-1793*#Dahlmann, M. Frohlich, R. Erker, G..tmReaction of a zirconocene(butadiene)borate-betaine single- component Ziegler catalyst with trimethylphosphane .'European Journal of Inorganic ChemistryaEur. J. Inorg. Chem. 20008MAUG EUR J INORG CHEMISI:000088396700016tal BulletinsRuss. Chem. Bull. 2000497 JUL RUSS CHEM BULLISI:000089679100005303-309 0*Panin, A. N. Babkina, O. N. Bravaya, N. M.Effect of substituents on the catalytic properties of bis(cyclopentadienyl)zirconium dichloride complexes with polymethylaluminoxane and AlBu3i/CPh3B(C6F5)(4) cocatalysts in ethylene polymerization, Russian Chemical BulletinRuss. Chem. Bull. 2000492FEB RUSS CHEM BULLISI:000087408400015j DR8810-821.F?Strauch, J. Warren, T. H. Erker, G. Frohlich, R. Saarenketo, P.b\Formation and structural properties of salicylaldiminato complexes of zirconium and titaniumInorganica Chimica Acta9Inorg. Chim. ActaG 2000 3008APR 30 INORG CHIM ACTAISI:0000874228000957825-826  Swanson, D. R. Negishi, E.tnGeneral and Convenient Procedure for the Preparation of Zirconocene Complexes of Alkenes and Conjugated DienesOrganometallicsMETAL-PROMOTED CYCLIZATION; X-RAY STRUCTURE; ZIRCONIUM; ENYNES; BICYCLIZATION; DERIVATIVES; HAFNOCENE; REAGENTS; H-1-NMR; DIYNES(!In situ generation of i-BuZrCp2Cl by treatment of Cp2ZrCl2 with 1 equiv of t-BuLi followed by addition of 1 equiv more of t- BuLi can serve as a satisfactory ''ZrCp2'' source, permitting direct conversion of various alkenes and dienes into the corresponding ZrCp2 complexes in high yields.oOrganometallicsa 1991104 APR ORGANOMETALLICSfISI:A1991FG97600001809-819B7Takahashi, T. Nitto, Y. Seki, T. Saburi, M. Negishi, E.eReaction of Dimethylzirconocene with Alkylmagnesium Halides as a Potentially General-Method for Preparing Zirconocene-Alkene ComplexesChemistry LettersO~xMETAL-PROMOTED CYCLIZATION; ETHYLENE COMPLEX; BICYCLIZATION; ZIRCONIUM; ENYNES; DERIVATIVES; HAFNOCENE; REAGENTS; DIYNESAddition of one equivalent of RCH2CH2MgX to Cp2ZrMe2 (Cp = C5H5) in the presence of PMe3 led to a transmetalation reaction to afford zirconocene-alkene complexes Cp2Zr(RCH=CH2)(PMe3) in good yields along with the formation of MeMgX. Chem. Lett.p 199012 DEC CHEM LETTiISI:A1990EP34500033t 8564-8566p`ZTakahashi, T. Hasegawa, M. Suzuki, N. Saburi, M. Rousset, C. J. Fanwick, P. E. Negishi, E.Zirconium-Catalyzed, Highly Regioselective Hydrosilation Reaction of Alkenes and X-Ray Structures of Silyl(Hydrido)Zirconocene Derivatives.(Journal of the American Chemical SocietyMETAL-PROMOTED CYCLIZATION; PRIMARY ORGANOSILANES; MOLECULAR- STRUCTURE; HYDRIDE COMPLEX; SI BONDS; ZIRCONOCENE; ALKYL; ACTIVATION; HYDROSILYLATION; POLYMERIZATIONoJ. Am. Chem. Soc.t 1991 113n22OCT 23 J AMER CHEM SOCISI:A1991GM03800077h 1579-1582cLFTakahashi, T. Suzuki, N. Kageyama, M. Nitto, Y. Saburi, M. Negishi, E.LECatalytic-Hydrogenation of Alkenes Using Zirconocene-Alkene ComplexesChemistry LettersnyMETAL-PROMOTED CYCLIZATION; CARBON-MONOXIDE; ALKYL; DERIVATIVES; ZIRCONIUM; HAFNOCENE; REDUCTION; OLEFINS; ENYNES; DIYNEST~Hydrogenation reactions of alkenes were catalyzed by zirconium- alkene complex derivatives which are prepared from Cp2ZrCl2 (Cp = eta-5-C5H5) and n equiv. of RR'CHCH2M (M = MgX or Li). By the use of three or more equiv. of EtMgBr relative to Cp2ZrCl2, the product yield of hydrogenation of 1-decene was remarkably improved most likely due to the stabilization of the Zr(II) species. Chem. Lett. 19919 SEP CHEM LETTOISI:A1991GG15300027P 8301-8304nNHTakahashi, T. Aoyagi, K. Denisov, V. Suzuki, N. Choueiry, D. Negishi, E.VPZirconium Catalyzed C-C Bond Formation Reaction of Conjugated Diynes with EtmgbrTetrahedron Letters TRANSITION-METAL CATALYSIS; ZIRCONOCENE-ALKENE COMPLEXES; CONTROLLED CARBOMETALATION; ALKYL-ALKENE; MAGNESIUM REAGENTS; DERIVATIVES; ROUTE; ETHYLMAGNESATION; CARBOALUMINATION; ALLYLZINCATIONThe carbon-carbon bond formation reactions of diynes with EtMgBr can be catalyzed by Cp(2)ZrCl(2). The final products, magnesiated enynes, readily undergo stereoisomerization to give a mixture of (E) and (Z) isomers. The stoichiometric reaction of diynes with ethylene zirconocene gives zirconacyclopentenes with alkynyl substituents in the alpha position with high regioselectivities.LTetrahedron Lett. 19933451DEC 17 TETRAHEDRON LETTISI:A1993MN26300031 3413-3414B;Takahashi, T. Kasai, K. Suzuki, N. Nakajima, K. Negishi, E.haIsolation and Characterization of the Ethylene-Bridged Zirconocene Complex (Cp(2)Zrme)(2)(Ch2ch2)oOrganometallicsdOLEFIN POLYMERIZATION CATALYSTS; BOND FORMATION REACTIONS; ONE- ELECTRON OXIDATION; ALKENE COMPLEXES; CARBON BOND; BENZYL COMPLEXES; ALKYL COMPLEXES; CATIONIC ALKYL; CHEMISTRY; ZIRCONIUMAn ethylene-bridged zirconocene complex, (Cp(2)ZrMe)2(CH2CH2), was prepared by the reaction of Cp(2)ZrMe(2) with a zirconocene-ethylene complex, [Cp(2)ZrEt(CH2=CH2)]MgBr, and the structure of this complex was determined by a single-crystal X- ray diffraction study. The structure of this complex showed one methyl group on each zirconium and an ethylene ligand simultaneously coordinating to the two zirconocene moieties.Organometallics 1994139eSEP ORGANOMETALLICSISI:A1994PF96700014 HBqRf> H 2400-2415o Phillips, R. A. Nguyen, T.Structure, processing, morphology, and property relationships of biaxially drawn Ziegler-Natta/metallocene isotactic polypropylene film("Journal of Applied Polymer SciencePIpolypropylene; biaxial orientation; metallocene; Ziegler-Natta METHYLALUMINOXANE CATALYST SYSTEM; SEMI-CRYSTALLINE POLYMERS; SIMULTANEOUS SMALL-ANGLE; ALPHA-OLEFIN COPOLYMERS; X-RAY- SCATTERING; PLASTIC-DEFORMATION; LINEAR POLYETHYLENE; ETHYLENEBIS(1-INDENYL)ZIRCONIUM DICHLORIDE; PROPYLENE POLYMERIZATION; STEREOCHEMICAL CONTROLThe structure, processing, morphology, and property relationships of biaxially drawn isotactic polypropylene (BOPP) film of mixed metallocene isotactic PP (m-iPP) and Ziegler- Natta iPP (ZN-iPP) homopolymer compositions are developed. The DSC and film drawing behavior show cocrystallization of the ZN- iPP and m-iPP components. The structure, processing, morphology, and property relations of ZN-iPP/ m-iPP blends are compared with ZN-iPP of varying isotacticities. The ZN-iPP/m- iPP blends exhibit reduced biaxial yield stress [sigma (y)(T)]. A fractional crystallinity model collapses the sigma (y)(T) data into a common normalized form over a range of draw temperatures, ZN-iPP tacticities, and blend compositions. The simplified model is extended to define the interrelationships of yield activation and strain hardening behavior into regimes differentiated by characteristic draw stress (crystallinity) levels. Structure-property models are developed to explain the effect of draw temperature and resin-blend microstructure on the draw behavior, film stiffness, barrier, elongation, and synergies of the BOPP film processing-property balance. (C) 2001 John Wiley & Sons, Inc.1J. Appl. Polym. Sci. 20018013JUN 24 J APPL POLYM SCI-ISI:000168041400003H 3115-3127b2,Pindado, G. J. ThorntonPett, M. Bochmann, M.0)Zirconium and hafnium diene and dienyl half-sandwich complexes: synthesis, polymerization catalysis and deactivation pathways. The molecular structures of [M(eta(3)-C3H5)(2,3-Me2C4H4){eta- C5H3(SiMe3)(2)-1,3}](M=Zr or Hf) and [Hf(eta(3)-C3H5){eta(3)- CH2CMeCMeCH2B-(C6F5)(3)}{eta-C5H3(SiMe2)-1,3}]:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 199718$SEP 21 J CHEM SOC DALTON TRANSISI:A1997XZ14400007609-610E2,Pindado, G. J. ThorntonPett, M. Bochmann, M.Facile alpha-C-H activation in 14-electron zirconium half- sandwich compounds: Evidence for a new catalyst deactivation pathwayuChemical CommunicationsP Chem. Commun.H 19976mMAR 21 CHEM COMMUNISI:A1997WQ73300050 393-4004-Pindado, G. J. Thornton-Pett, M. Bochmann, M. New monocyclopentadienyl complexes of group 4 and 5 metals with chelating nitrogen ligands. Crystal and molecular structures of [Zr(eta(3)-C3H5)(eta(4)-Ph2N2C2Me2-2,3)Cp ''] and [TaCl2{,eta(4)-C6H4C(NSiMe3-1,2)(2)}Cp ''] [Cp '' = C5H3(SiMe3)(2)-1,3]:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19983$FEB 7 J CHEM SOC DALTON TRANSISI:000072111100013133-137.Plenio, H. Warnecke, A.eta(5)-complexes of cyclopentadienylsilylethers (C5H4OSiR3) and hydroxycyclopentadiene (C5H4OH) with titanium and zirconium chlorides *#Journal of Organometallic ChemistryaJ. Organomet. Chem.2 1997 544a1OCT 5 J ORGANOMETAL CHEMISI:A1997YB98100019509-551Poli, R.PJMonocyclopentadienyl Halide-Complexes of the D-Block and F- Block ElementsChemical Reviews Chem. Rev. 1991914 JUN CHEM REVISI:A1991FT26000004C 2135-2204Poli, R.Open shell organometallics as a bridge between Werner-type and low-valent organometallic complexes. The effect of the spin state on the stability, reactivity, and structureChemical Reviews Chem. Rev. 19969667SEP-OCT CHEM REVISI:A1996VK56700013173-178 PIPolo, E. Green, M. L. H. Benetollo, F. Prini, G. Sostero, S. Traverso, O.e~A sterically hindered bis-eta-alkylcyclopentadienylzirconium compound as catalyst for the polymerisation of ethene and propene*#Journal of Organometallic ChemistryHJ. Organomet. Chem.W 1997 5277 1-2 JAN 11 J ORGANOMETAL CHEM ISI:A1997WB286000240211-218AHAPolo, E. Bellabarba, R. M. Prini, G. Traverso, O. Green, M. L. H.aSynthesis of ring-substituted bis-eta(5)-cyclopentadienyl derivatives of the group IV elements containing the bicyclic ligands eta(5)-C5H3(1,2-CH2-)(n), n = 4, 5, or 6C*#Journal of Organometallic ChemistryNJ. Organomet. Chem. 1999 577l2tAPR 1 J ORGANOMETAL CHEMISI:000079632800009 LING Xiaolan LING Xiaolan LING Xiaolan\" 06" 060606# 06# 06# 060606& 06& 06060(0@0J0J0J0J 0J 0J 0J(0@0J0J0J0J 0J 0J0J0J0(0q0 0 0 0(0q000(0q 0O0O00 0 0 0000@0@0@0@0@0 00N X2J   ^ X/X2$MUSaц?p2$ L`Sp@0(  B S  ?  07=D  0 5 e   Tjm%8cie  333333USCS.\\USCSHOME1\USERS\KAPU9\My Documents\uk-cv.docUSCSC\\USCSHOME1\USERS\KAPU9\My documents\AutoRecovery save of uk-cv.asdUSCS.\\USCSHOME1\USERS\KAPU9\My Documents\uk-cv.docUSCS.\\USCSHOME1\USERS\KAPU9\My Documents\uk-cv.docUSCS.\\USCSHOME1\USERS\KAPU9\My Documents\uk-cv.docUSCS A:\uk-cv.doc LING XiaolanC:\WINDOWS\Deht`DCB P 2291-2292D=Bazan, G. C. Rodriguez, G. Ashe, A. J. AlAhmad, S. Muller, C.b[Aminoboratabenzene derivatives of zirconium: A new class of olefin polymerization catalysts.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.9 1996 11859 MAR 6 J AMER CHEM SOCSISI:A1996TY69800023 1371-1380CNGBazan, G. C. Cotter, W. D. Komon, Z. J. A. Lee, R. A. Lachicotte, R. J.F<5Electron-donating properties of boratabenzene ligandsC.(Journal of the American Chemical SocietyOLEFIN POLYMERIZATION CATALYSTS; CATIONIC ALKYLZIRCONIUM COMPLEXES; D(0)F(N) TRANSITION-METALS; ZIEGLER-NATTA CATALYSTS; ZIRCONIUM COMPLEXES; ALPHA-OLEFINS; ETHYLENE POLYMERIZATION; BORABENZENE DERIVATIVES; LIVING POLYMERIZATION; GROUP-4 METALLOCENE|uThe reaction of (C5H5B-R)Cp*ZrMe2 (Cp* = eta(5)-C5Me5; R = NMe2 (4), OEt (5), Ph (6)) with B(C6F5)(3) affords zwitterionic complexes of the type [(C5H5B-R)Cp*ZrMe] [MeB(C6F5)(3)] (R = NMe2 (7), OEt (8), Ph (9)). The molecular structures of 7 and 9 were determined by single-crystal X-ray diffraction studies, and they were found to be similar to those observed for standard group 4 metallocenes. The boratabenzene ligand in 7 more closely resembles an eta(5)-pentadienyl fragment than in 9, where it is eta(6)-bound. Variable-temperature H-1 NMR spectroscopy shows that ion-pair dissociation/recombination processes occur in solution. Data over large temperature ranges were obtained by the combination of line shape and spin saturation transfer techniques (100 degrees C for 4 and 5, 65 degrees C for 4). The rates of these processes give insight into how the orbital overlap between boron and the exocyclic group affects the rates of elementary reactions at the metal. The Delta H-double dagger values for ion-pair dissociation/recombination were found to increase with decreasing donor strength of the substituent: 12.2(2), 12.6(1), and 17.6(3) kcal/mol for 7, 8, and 9, respectively. Exchange reactions between 9 and 4 reveal that 7 is formed exclusively, indicating that the aminoboratabenzene ligand can better accommodate the increased positive charge on the metal center. The dependence of the carbonyl stretching frequency on the extent of metal back-bonding in complexes of the type (C5H5B- R)Cp*Zr(CO)(2) (R = NMe2 (10), OEt (11), Me (12), Ph (13)) and (C5H5B-R)(2)Zr(CO)(2) (R = NMe2 (14), OEt (15), Me (16), Ph (17)) can also be used to gauge the electron density at Zr. Complexes 10-17 were prepared by reductive carbonylation of the corresponding dichlorides. The measured reduction potentials of the dichlorides, (C5H5B-R)(2)ZrCl2, show that it is progressively more difficult to reduce the metal center as the donor strength of the boratabenzene ligand increases. The dynamic NMR, IR, and electrochemical data are consistent with the notion that the donor properties in [C5H5B-R] ligands decrease in the order R = NMe2 > OEt approximate to Me > Ph.J. Am. Chem. Soc. 2000 1227FEB 23 J AMER CHEM SOCISI:000085639200015 12176-12180P}Bazhenova, T. A. Kulikov, A. V. Shestakov, A. F. Shilov, A. E. Antipin, M. Y. Lyssenko, K. A. Struchkov, Y. T. Makhaev, V. D.Structure of ([(Eta(5)-C5h5)(2)Zr(Mu- P(C6h5))](2))([(Thf)(3)Li](2)(Mu-Cl)) and Its Implications for the Nature of Dilithium Dinitrogen Complex.(Journal of the American Chemical Society"NITROGEN-FIXATION; CHEMISTRYX-ray structure of the complex salt {[Cp(2)Zr(mu- PPh)](2)}{[(THF)(3)Li](2)(mu-Cl)}, 1, as well as its EPR spectrum and magnetic susceptibility have been investigated. The results indicate that the anionic part of the complex is the mixed valence [Zr(III)Zr(IV)] monoanion. From the comparison of the complex 1 and dinitrogen complex {[Cp(2)- Zr(mu-PPh)](2)}{[(THF)(3)Li](2)(mu-N-2)}, 2, published elsewhere it follows that the anions of both the complexes are identical and therefore the cation of 2 has also a unit charge. it is concluded that the cation {[(THF)(3)Li](2)(mu-N-2)}(+) can be regarded as a complex of N-2 with the pair (Li...Li)(+) or that of N-2(-) stabilized by two Li+ cations. Theoretical grounds for the existence of such complex ion are discussed.J. Am. Chem. Soc. 1995 11749DEC 13 J AMER CHEM SOCISI:A1995TK38200018704-708 {Bazhenova, T. A. Ivleva, I. N. Kulikov, A. V. Shestakov, A. F. Shilov, A. E. Antipin, M. Y. Lysenko, K. A. Struchkov, Y. T.Molecular-Structure of Lithium-Zirconium Complex Salt ([(C5h5)(2)Zr(Mu-P(C6h5))](2)) ([(Thf)(3)Li](2)(Mu-Cl)) - Inference About Nature of Dilithium Complexes with Molecular Nitrogen Koordinatsionnaya KhimiyaFIXATION; CHEMISTRYKoord. Khimiya 1995219SEP KOORD KHIMISI:A1995RZ68200008 69-145$Bazhenova, T. A. Shilov, A. E.$Nitrogen-Fixation in Solutiono$Coordination Chemistry ReviewsNITROGEN; NITROGENASE; REDUCTION IRON-MOLYBDENUM COFACTOR; AZOTOBACTER-VINELANDII; MOLECULAR NITROGEN; FEMO-COFACTOR; DINITROGEN REDUCTION; CRYSTAL- STRUCTURE; CRYSTALLOGRAPHIC STRUCTURE; COORDINATED DINITROGEN; ALPHA-SUBUNIT; N-2 LIGANDX-ray and other recent data on the nitrogen fixing enzyme, nitrogenase, reveal important details of its structure and provide the opportunity to make plausible conclusions on the mechanism of its functioning, Comparisons with chemical model systems reducing N-2 to hydrazine and ammonia show close similarities to the enzyme systems, in addition to their own peculiarities, The structure of these N-2 complexes with transition metals is discussed in relation to the mechanism of dinitrogen reduction in the metal coordination sphere, This helps in understanding the requirements for a complex to be a catalyst for N-2 reduction in protic media under the action of mild reducing agents.Coord. Chem. Rev. 1995 144OCT COORD CHEM REVISI:A1995TF86100004 4785-4790ABenard, M. Rohmer, M. M.Abinitio Configuration-Interaction Study of the Metal Metal Coupling in Some Zr(Iii) and Ti(Iii) Dimers - Evidence for a Superlong Zr-Zr Bond in [Cp2zr(Mu-Pr2)]2 and Related Complexes9.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.0 1992 114912JUN 3 J AMER CHEM SOCISI:A1992HX81500050 16913-169244-Benard, M. Rohmer, M. M. Poblet, J. M. Bo, C.Diversity in the Electronic-Structures of Metallocarbohedrenes - Ab-Initio Study of M(8)C(12) (M=Ti, V, Zr, Nb) and Ti(4)M'(4)C(12) (M'=V, Zr)$Journal of Physical ChemistryJ. Phys. Chem. 19959946NOV 16 J PHYS CHEMISI:A1995TE75400017 1957-1959F?Benech, J. M. Bonomo, L. Solari, E. Scopelliti, R. Floriani, C.zPorphomethenes and porphodimethenes synthesized by the two- and four-electron oxidation of the meso-octaethylporphyrinogen.'Angewandte Chemie-International EditionAngew. Chem.-Int. Edit. 199938 13-14UANGEW CHEM INT EDISI:000081511900023R  j_ <4;t915-917 ,%Etienne, M. Choukroun, R. Gervais, D. Electron-Spin Resonance and Electrochemical Studies of Monocyclopentadienyl-Titanium(Iii) and "Monocyclopentadienyl- Zirconium(Iii) Derivatives [M(Eta-5-C5h5)R2] Involving Chelated Phosphinomethyl (R = Ch2pph2) and Phosphinoacetate (R = O2cch2pph2) Ligands:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 19845J CHEM SOC DALTON TRANSISI:A1984SR87800025 3903-3907i.'Evans, W. J. Boyle, T. J. Ziller, J. W.Formation of a Highly-Ordered Polymeric, Supersandwich Metallocene - the 1st X-Ray Crystal-Structure of a Base-Free Lithium Cyclopentadienide, ([Mu-Mu-5, Eta-5-C5h4(Sime3)]Li)NOrganometallicsJDSIMPLEST METALLOCENE; COMPLEXES; GEOMETRY; LIGANDS; COMPOUND; SODIUMCrystals of {[mu-eta5:eta5-C5H4(SiMe3)]Li}n form in the space group P1BAR with a = 8.402 (2) angstrom. b = 11.778 (3) angstrom, c = 14.740 (4) angstrom, alpha = 81.25 (2)-degrees; beta = 80.76 (2)-degrees, gamma = 77.30 (2)-degrees, V = 1394.1 (5) angstrom3, and D(calcd) = 1.03 g cm-3 for Z = 2. Least- squares refinement of the model based on 2902 reflections (\F(o)\ > 3.0sigma\F(o)\) converged to a final R(F) = 5.44%. The structure consists of parallel chains of LiC5H4SiMe3 units which extend along the b-axis. In each chain, lithium atoms alternate with the C5H4SiMe3 rings to form a continuous polymeric sandwich structure. Within a chain, the dihedral angles between cyclopentadienyl planes are 5.1-8.1-degrees and the Li-(ring centroid distances range from 1.957 to 1.982 angstrom. The orientation of the SiMe3 substituents in the trimetallic (LiC5H4SiMe3)3 repeat unit found in the chains generates a highly ordered interchain structure.Organometallics 19921111NOV ORGANOMETALLICSISI:A1992JY62500066 1120-1122A.'Evans, W. J. Boyle, T. J. Ziller, J. W.rStructural Diversity in Bis(Pentamethylcyclopentadienyl)Yttrium Chloride Complexes - Cocrystallization of [(C5me5)2y(Mu- Cl)2li(Thf)2] and [(C5me5)2ycl(Mu-Cl)Li(Thf)3]Inorganic ChemistryRAY CRYSTAL-STRUCTURE; HIGHLY REACTIVE ORGANOLANTHANIDES; ORGANOMETALLIC COMPOUNDS; LUMINESCENCE SPECTRA; LANTHANIDE ELEMENTS; HYDRIDE COMPLEXES; ALKYL-DERIVATIVES; METAL OXIDATION; CHEMISTRY; HALIDE Inorg. Chem. 19923163MAR 18 INORG CHEMvISI:A1992HK15800043i 2125-2129eXREvans, W. J. Johnston, M. A. Greci, M. A. Ansari, M. A. Brady, J. C. Ziller, J. W.Synthesis of arene-soluble mixed-metal Zr/Ce, Zr/Y, and related {[Zr-2((OPr)-Pr-i)(9)]LnX(2)}(n) complexes using the dizirconium nonaisopropoxide ligandInorganic Chemistry7 Inorg. Chem. 20003910MAY 15 INORG CHEM ISI:000087124000019106-113K@:Ewart, S. W. Sarsfield, M. J. Williams, E. F. Baird, M. C.Ethylene and propylene polymerization by cationic monocyclopentadienyl titanium catalysts containing the weakly coordinating anion [B(C6F5)(4)](-)*#Journal of Organometallic ChemistryeJ. Organomet. Chem.a 1999 579y 1-2 MAY 5 J ORGANOMETAL CHEMISI:000081042800015C167-170& Fan, Z. Q. Yasin, T. Feng, L. X.nhEffect of polymerization temperature on propylene polymerization with C-s-symmetric metallocene catalystChinese Chemical LettersHApolymerization; metallocene catalyst; propylene CRYSTAL-STRUCTUREA novel highly active C-s-symmetric metallocene catalyst namely: meso-dimethylsilylbis (2,4,6-trimethyl-1 - indenyl)zirconium dichloride is presented. The effect of polymerization temperature (0-70 degrees C) on the catalyst performance for propylene polymerization has been investigated. This catalyst shows very high activity at 50 degrees C which is higher than the activity of the racemic analogue, and the resulted polypropylene is amorphous in nature with isotactic pentad content [mmmm] of 12 %.Chin. Chem. Lett. 2000112FEB CHIN CHEM LETTISI:000085088900027 2990-2995PIFandos, R. Hernandez, C. Otero, A. Rodriguez, A. Ruiz, M. J. Terreros, P..Synthesis and characterization of 2-pyridylalkoxide complexes of titanium, zirconium and tantalum. Crystal structures of TiCp*Me-2(OCMePy2) and TaCp*Cl-3(OCPy3) (Cp* = eta(5)-C5Me5, Py = C5H4N)c:3Journal of the Chemical Society-Dalton Transactionsa"J. Chem. Soc.-Dalton Trans. 200017J CHEM SOC DALTON TRANS7ISI:000088987800018R 5010-5015aFeil, F. Harder, S.e\Ualpha,alpha-bis(trimethylsilyl)-substituted benzyl complexes of potassium and calciumOrganometallicsCRYSTAL-STRUCTURE; X-RAY; ORGANOMETALLIC COMPOUNDS; SOLUTION BEHAVIOR; METALS MAGNESIUM; ALKALI-METAL; = SIME3; BARIUM; STRONTIUM; ALKOXIDESTNThe first benzylcalcium complex, (alpha,alpha - bis(trimethylsilyl)benzyl)(2)calcium . (THF)(2) (7), has been prepared by reacting CaI2 with alpha,alpha - bis(trimethylsilyl)benzylpotassium (6) in THF. The solid state structure of the K precursor shows an interesting Lewis base- free coordination polymer in which the coordination sphere of K is additionally saturated by agostic Si-Me . . .K interactions. The crystal structure of the Ca product displays a THF-solvated monomeric compound, which shows considerably less delocalization of negative charge into the phenyl ring than the corresponding K compound. NMR investigations as well as ab initio calculations show that the TMS substituents at the benzylic carbon have a charge-localizing influence. Only the more ionic K precursor shows activity in initiating the polymerization of styrene.Organometallics 20001924NOV 27 ORGANOMETALLICSISI:000165617100013 33-40 .(Feng, Z. F. Xie, J. Chen, B. Qian, Y. L.D>The development of research on dinuclear metallocene catalysts*$Chinese Journal of Organic Chemistrydinuclear metallocene complexes; catalysts; polymerization of olefine BINUCLEAR METALLOCENES; C BOND; COMPLEXES; POLYMERIZATION; ZIRCONIUM; LIGANDS; HETEROBIMETALLICS; REACTIVITY; INSERTION; TITANIUMThe synthesis of homodinuclear and heterodinuclear metallocene complexes is reviewed. The research about their activity on polymerization of olefine is summarized. The mechanism about dinuclear metallocene catalyst is also discussed in this paper.Chin. J. Org. Chem.n 2001211dJAN CHINESE J ORG CHEMISI:000166189800005t)?-118-122 ("Harder, S. Prosenc, M. H. Rief, U.D=Syntheses and X-ray structures of anionic sodocene sandwichespOrganometallicssBThe development of research on dinuclear metallocene catalysts*$Chinese Journal of Organic Chemistrydinuclear metallocene complexes; catalysts; polymerization of olefine BINUCLEAR METALLOCENES; C BOND; COMPLEXES; POLYMERIZATION; ZIRCONIUM; LIGANDS; HETEROBIMETALLICS; REACTIVITY; INSERTION; TITANIUMThe synthesis of homodinuclear and heterodinuclear metallocene complexes is reviewed. The research about their activity on polymerization of olefine is summarized. The mechanism about dinuclear metallocene catalyst is also discussed in this paper.Chin. J. Org. Chem.n 2001211dJAN CHINESE J ORG CHEMISI:000166189800005t86NGTetra-acetonitrile-tri-iodo-zirconium acetonitrile-penta-iodo-zirconiumN Vestn.Mosk.Univ.,Ser.Khim.27 575S FINBAF 2798-2801e0*Troyanov, S. I. Mazo, G. N. Rybakov, V. B.d^Crystal-Structure and Physical and Chemical-Properties of Tetrachloro(2,2'-Bipyridyl)Zirconium$Zhurnal Neorganicheskoi KhimiiZhurnal Neorg. Khimii  19883311NOV ZH NEORG KHIM ISI:A1988R3028000161$Troyanov, S. I. Rybakov, V. B. 198960Metalloorg. Khim. (Organometallic Chem. in USSR)2l 1382 JISLIG 1221-1223a4.Troyanov, S. I. Kulikova, N. N. Nikitin, K. N.JCSynthesis and Structure of Zirconium(Iv) Chloride-Formamide Complext Koordinatsionnaya KhimiyaKoord. Khimiya 1990169m KOORD KHIMISI:A1990EF49400009  49-55L0)Troyanov, S. I. Antropiusova, H. Mach, K. Direct Proof of the Molecular-Structure of Dimeric Titanocene - the X-Ray Structure of Mu-(Eta-5-Eta-5-Fulvalene)-Di-(Mu- Hydrido)-Bis(Eta-5-Cyclopentadienyltitanium)Bullet-1.5benzene*#Journal of Organometallic ChemistryThe dimeric titanocene crystallizes as a benzene solvate with molar ratio 1:1.5. The crystals are monoclinic, space group P2(1)/n with Z = 4 and lattice parameters a = 5.978(4), b = 14.541(6), c = 26.963(8) angstrom and beta = 92.11(2)-degrees. In the series of (C10H8)[(C5H5)TiX]2 complexes, where X = H, H/Cl (1:1), Cl or OH, the dihydrido complex has the shortest Ti-Ti distance (2.989 angstrom) and largest dihedral angle between the planes of C5H4 rings of the fulvalene ligand (17.7- degrees).J. Organomet. Chem. 1992 4271APR 7 J ORGANOMETAL CHEMISI:A1992HP14100006130-135Troyanov, S. I.k|vArene Complexes of Zirconium Containing Triangular Cluster Cations [(Eta-6-C(6)H(6)Me(3))(3)Zr-3(Mu-Cl)(6)](N+), N=2,3 Russian Chemical BulletinDRuss. Chem. Bull.  1994431hJAN RUSS CHEM BULLISI:A1994PX98300026 * l& l& 2755-2764e&Nomura, K. Oya, K. Imanishi, Y.HCopolymerization of ethylene with alpha-olefin catalyzed by [1,8-C10H6((NSiBuMe2)-Bu-t)(2)]TiCl2 and [ArN(CH2)(3)NAr]TiCl2 (Ar=2, 6-(Pr2C6H3)-Pr-i)-MMAO catalyst systemsPolymer copolymerization; ethylene; alpha-olefin CHELATING DIAMIDE COMPLEXES; M = TI; ZIRCONIUM COMPLEXES; POLYMERIZATION CATALYSTS; <1;8-C10H6(NR)(2)>TICL2-COCATALYST SYSTEM; TITANIUM(IV) COMPLEXES; LIVING POLYMERIZATION; GROUP-4 COMPLEXES; ANCILLARY LIGAND; AMIDO CATALYSTS("Copolymerization of ethylene with 1-hexene, 1-octene and 1- decene catalyzed by [1.8-C10H6(NR)(2)]TiCl2 [R = (SiBuMe2)-Bu-t (1)] and [ArN(CH2)(3)NAr]TiCl2 [Ar = 2,6-(Pr2C6H3)-Pr-i (2)] complexes-MMAO (MMAO = methyl isobutyl aluminoxane) catalyst systems have been explored. It was revealed that alpha-olefin contents in the resultant copolymer are highly dependent upon catalyst complex used. The resultant copolymer with 1 gave relatively broad molecular weight distributions, consisting of high and low molecular weight copolymers. On the other hand, it was difficult to prepare high molecular weight (M-w > 100, 000) copolymer with low alpha-olefin content if complex 2 was employed as the catalyst component. The resultant copolymers prepared by both 1 and 2 have been analyzed by DSC, C-13 NMR, and CFC (cross-fractionation chromatography). The design of catalyst structure as well as ligands is thus necessary to prepare the desired ethylene/alpha-olefin copolymers by non- metallocene type catalyst. (C) 2000 Elsevier Science Ltd. All rights reserved.Polymer 20004181 APR POLYMERISI:000084839900005M243-252 @:O'Donoghue, M. B. Davis, W. M. Schrock, R. R. Reiff, W. M.TNHeterobimetallic dinitrogen complexes that contain the {[N3N]Mo-N=N)(-) ligandInorganic ChemistryC Inorg. Chem. 1999382iJAN 25 INORG CHEMISI:000078290900008 4689-4694RB 4) provides indefinable secondary and decomposition products.nJ. Organomet. Chem.e 1996 520  1-2tAUG 9 J ORGANOMETAL CHEMISI:A1996VG12500023( 1533-1534eD=Tillack, A. Lefeber, C. Peulecke, N. Thomas, D. Rosenthal, U.eRKThe hydrosilylation of ald- and ketimines catalyzed by titanocene complexesTetrahedron Letters Different titanocene complexes 1 - 10 were tested in the catalytic hydrosilylation of ald and ketimines with Ph(2)SiH(2). The highest conversions were obtained with Cp(2)Ti(Ph=CSiMe(3)) 1 up to 98 % at room temperature. (C) 1997 Elsevier Science Ltd.Tetrahedron Lett. 1997389MAR 3 TETRAHEDRON LETTISI:A1997WK63200020i 47-54.Tripathi, U. N..|uSynthesis and spectroscopic studies of O,O ' alkylene dithiophosphato complexes of metallocenes; CP2ML2[M = Ti or Zr]<6Phosphorus Sulfur and Silicon and the Related Elements,&Phosphorus Sulfur Silicon Relat. Elem. 2000 159 PHOSPHOR SULFUR SILICONyISI:000088138000004r107-114.RKTritto, I. Zucchi, D. Destro, M. Sacchi, M. C. Dall'Occo, T. Galimberti, M.haNMR investigations of the reactivity between zirconocenes and beta-alkyl-substituted aluminoxanes0)Journal of Molecular Catalysis a-Chemical0J. Mol. Catal. A-Chem. 2000 16091A OCT 23 J MOL CATAL A-CHEMLISI:0000894313000119 1787-1790<5Trobajo, C. Khainakov, S. A. Espina, A. Garcia, J. R.D4-On the synthesis of alpha-zirconium phosphateChemistry of Materials Chem. Mat. 2000126JUN CHEM MATERISI:000087708400045. 82-85.60Troyanov, S. I. Liopis, H. S. Tsyrelnikov, V. I.4.Crystal Modifications of Zirconium Tetraiodide81Vestnik Moskovskogo Universiteta Seriya 2 Khimiya *#Vestn. Mosk. Univ. Seriya 2 Khimiya 1981221 VESTN MOSK UNIV KHIMISI:A1981LF05600015E.(Troyanov,S. I. Mazo,G. N. Simonov, M. A. 1986NGTetra-acetonitrile-tri-iodo-zirconium acetonitrile-penta-iodo-zirconiumN Vestn.Mosk.Univ.,Ser.Khim.27 575S FINBAF 2798-2801e0*Troyanov, S. I. Mazo, G. N. Rybakov, V. B.d^Crystal-Structure and Physical and Chemical-Properties of Tetrachloro(2,2'-Bipyridyl)Zirconium$Zhurnal Neorganicheskoi KhimiiZhurnal Neorg. Khimii  19883311NOV ZH NEORG KHIM ISI:A1988R3028000161$Troyanov, S. I. Rybakov, V. B. 198960Metalloorg. Khim. (Organometallic Chem. in USSR)2l 1382 JISLIG 1221-1223a4.Troyanov, S. I. Kulikova, N. N. Nikitin, K. N.JCSynthesis and Structure of Zirconium(Iv) Chloride-Formamide Complext Koordinatsionnaya KhimiyaKoord. Khimiya 1990169m KOORD KHIMISI:A1990EF49400009  49-55L0)Troyanov, S. I. Antropiusova, H. Mach, K. Direct Proof of the Molecular-Structure of Dimeric Titanocene - the X-Ray Structure of Mu-(Eta-5-Eta-5-Fulvalene)-Di-(Mu- Hydrido)-Bis(Eta-5-Cyclopentadienyltitanium)Bullet-1.5benzene*#Journal of Organometallic ChemistryThe dimeric titanocene crystallizes as a benzene solvate with molar ratio 1:1.5. The crystals are monoclinic, space group P2(1)/n with Z = 4 and lattice parameters a = 5.978(4), b = 14.541(6), c = 26.963(8) angstrom and beta = 92.11(2)-degrees. In the series of (C10H8)[(C5H5)TiX]2 complexes, where X = H, H/Cl (1:1), Cl or OH, the dihydrido complex has the shortest Ti-Ti distance (2.989 angstrom) and largest dihedral angle between the planes of C5H4 rings of the fulvalene ligand (17.7- degrees).J. Organomet. Chem. 1992 4271APR 7 J ORGANOMETAL CHEMISI:A1992HP14100006130-135Troyanov, S. I.k|vArene Complexes of Zirconium Containing Triangular Cluster Cations [(Eta-6-C(6)H(6)Me(3))(3)Zr-3(Mu-Cl)(6)](N+), N=2,3 Russian Chemical BulletinDRuss. Chem. Bull.  1994431hJAN RUSS CHEM BULLISI:A1994PX98300026 T[Z>(\ 9123-9134rd]Takahashi, T. Xi, Z. F. Nishihara, Y. Huo, S. Q. Kasai, K. Aoyagi, K. Denisov, V. Negishi, E.uConvenient preparative method of alpha,beta-disubstituted cyclopentenone by zirconium promoted intermolecular coupling of an alkyne, EtMgBr (or ethylene) and CO TetrahedronlZIRCONOCENE-ALKENE COMPLEXES; CYCLIC CUMULENE; CYCLIZATION; ENYNES; DIYNES; BICYCLIZATION; DIENES; ZIRCONACYCLOPENTENES; CARBONYLATION; DERIVATIVESi6/Treatment of Cp2ZrCl2 with 2 equiv of EtMgBr in THF, followed by addition of an internal alkyne and subsequent treatment with CO/I-2 gave alpha,beta-disubstituted cyclopentenone in good to high yields. When a conjugated enyne was used as an alkyne component, alpha-alkenyl cyclopentenone was selectively formed in 80-89% yields. In the case of 4,6-decadiyne, alpha- alkynylcyclopentenone was formed in 88% yield. Bridged alkynes such as 1,4-dihexynytbenzene afforded alpha alpha'-bridged cyclopentenone compounds in good yields. (C) 1997 Elsevier Science Ltd.b Tetrahedrong 19975327JUL 7 TETRAHEDRONtISI:A1997XJ79300011n 6802-6806lZSTakahashi, T. Xi, C. J. Xi, Z. F. Kageyama, M. Fischer, R. Nakajima, K. Negishi, E.Selective intermolecular coupling of alkynes with nitriles and ketones via beta,beta ' carbon-carbon bond cleavage of zirconacyclopentenes"Journal of Organic ChemistryMETAL-PROMOTED CYCLIZATION; ZIRCONOCENE COMPLEXES; METALLACYCLE TRANSFER; GRIGNARD-REAGENTS; CONVENIENT METHOD; ZIRCONIUM; REACTIVITY; ALKENES; HETEROCYCLES; DERIVATIVESSelective intermolecular coupling of alkynes with nitriles and ketones was performed by the reaction of a mixture of alkynes and Cp2ZrEt2 with nitriles and ketones, respectively. Hydrolysis of the mixture gave alpha,beta-unsaturated ketones and allylic alcohols in good to excellent yields, respectively. These reactions proceeded via zirconacyclopentenes which were prepared by the reaction of alkynes with Cp2ZrEt2. The structure of zirconacyclopentene, which was prepared from diphenylacetylene and Cp2ZrEt2, was determined by X-ray analysis. It clearly indicated that there is a single bond between the beta- and beta'-carbons of the zirconacyclopentene. The reaction of zirconacyclopentenes with nitriles or ketones proceeded via the beta,beta' carbon-carbon bond cleavage of the zirconacyclopentenes. In a similar way, addition of PMe3 to the zirconacyclopentene afforded a zirconocene-alkyne complex in 87% yield. J. Org. Chem. 19986320OCT 2 J ORG CHEMISI:000076380300015155-159S>7Tanner, P. S. Overby, J. S. Henein, M. M. Hanusa, T. P.XQCyclopentadienyl ring metathesis with organocalcium and organopotassium compounds; Chemische Berichte-Recueilcyclopentadienes; metathesis; potassium; calcium; main-group elements; sandwich complexes RAY CRYSTAL-STRUCTURE; MAIN-GROUP ELEMENTS; ELECTRONIC- STRUCTURES; COMPLEXES; REACTIVITY; CHEMISTRY; BIS(CYCLOPENTADIENYL)TIN; METALLOCENES; (C5ME5)2SM; BEHAVIORCyclopentadienyl ring metathesis occurs between [Ca(C(5)Me(5))(2)] and [Ln(C5H5)(3)] complexes in toluene to generate the mixed ring compounds [Ln(C(5)Me(5))(2)(C2H5)] (Ln = 1-La, 1-Nd). 1-Nd has been characterized with X-ray diffraction as a sterically crowded monomer. Only one ring is exchanged between [Ca(C(5)Me(5))(2)(thf)(x)] and [La(C5H5)(3)(thf)(x)] in toluene to yield [La(C(5)Me(5))(C5H5)(2)(thf)] (2) In reaction with [M(C5H5)(2)] (M = Sn, Pb. Mn), [Ca(C(5)M(5))(2)(thf)(x)] yields the corresponding [M(C(5)Me(5))(2)] complexes. K[C(5)Me(5)] reacts with [La(C5H5)(3)(thf)], [Sn(C5H5)(2)] and [Pb(C5H5)(2)] in toluene to yield the ring-exchanged products 2, [Sn(C(5)Me(5))(2)], and [Pb(C(5)Me(5))(2)], respectively.Chem. Ber.-Recl. 1997 1302FEB CHEM BER-RECLISI:A1997WK02100002456-460.TMTarafder, M. T. H. Ali, M. A. Wee, D. J. Azahari, K. Silong, S. Crouse, K. A.pTNComplexes of a tridentate ONS Schiff base. Synthesis and biological properties Transition Metal ChemistryTransit. Met. Chem. 2000254MTRANSIT METAL CHEMISI:000087070800019- 1501-1505Thewalt, U. Lasser, W.xq5 Coordinate Zirconium(Iv) Complexes with the (Eta-C5h5)2zriv Unit - the Structure of (Eta-C5h5)2zr(Cf3so3)2(Thf)NGZeitschrift Fur Naturforschung Section B-a Journal of Chemical SciencesZ.Naturforsch.(B)n 19833811Z NATURFORSCH SECT BISI:A1983RT07200030303-313R*#Thewalt, U. Klima, S. Berhalter, K.UCyclic Trinuclear Zirconium Complex with Penta-Coordinated Central Atoms - Preparation and Structure of Tris[(Di-Pi- Cyclopentadienyl)(Mu-Terephthalato)Zirconium(Iv)]- Dichloromethane(1/1)*#Journal of Organometallic ChemistrytJ. Organomet. Chem.u 1988 342t3a MAR 22 J ORGANOMETAL CHEMeISI:A1988M684300004l dY MONOMERSEMONOSUBSTITUTEDIOMONOSUBSTITUTED ALKENESSI MONOXIDEEMULTIPLE BONDSETE N-2 LIGANDNIT N-ligands N-methyl-epsilon-caprolactam neodymium neomenthylcyclopentadienylmerNICKEL(0) COMPLEXESct NIOBIUMM NIOBOCENENITRILE COMPOUNDS NITROGENSNITROGEN-FIXATION NITROGENASENMRalnon-conjugatedactNONCONJUGATED DIENESI NORBORNENESUC$ nuclear magnetic resonance (NMR) NUCLEAR MAGNETIC-RESONANCE$ octahedral bis-chelate complexes OLEFINRIZOLEFIN POLYMERIZATION$OLEFIN POLYMERIZATION CATALYST$OLEFIN POLYMERIZATION CATALYSTS olefineiz OLEFINSRYOLIGOMERIZATIONNLONE- OPEN METALLOCENESOPEN VANADOCENESS$!OPENING METATHESIS POLYMERIZATIONopening reactions ORGANIC-TORGANIC-SYNTHESIS,(ORGANOACTINIDE COORDINATIVE UNSATURATION41Organohalfium compounds, organozirconium compound ORGANOLANTHANIDE COMPLEXESZORGANOLITHIUM REAGENTSORGANOMETALLICXESORGANOMETALLIC COMPOUNDSDorganopotassium compounds ORGANOSILANESORGANOSILICON COMPOUNDSIOorganosodium compoundsnds,(ORGANOTRANSITION-METAL METALLACARBORANESORGANOYTTRIUM COMPLEXORGANOZIRCONIUMPLORGANOZIRCONIUM COMPOUNDS OXIDATION OXOPHILIC TRANSITION-METALSONOXOVANADIUM(IV)RE oxygen-functional comonomerPAIR FORMATIONAL pentamethylcyclopentadienylZPENTAMETHYLENE SPACERSSENperfluorophenylymPERMETHYLTITANOCENEPHME3PHASE-SEPARATIONIphenylnorbornenepphosphanido ligandum PHOSPHIDE phosphinePHOSPHINE COMPLEXESMPPHOSPHINE-LIGANDS phosphinidenePHOSPHINIDENESUREPHOSPHINOMETHYL COMPLEXES phosphoranes PHOSPHORUSDPHTal PI GROUPS PLANAR-TETRACOORDINATE CARBONPLASTIC-DEFORMATIONMEPOLAR VINYL COMONOMERSZATPOLARIZATION POTENTIALS LPOLY(PROPYLENE)TU polyethene br POLYETHYLENEE POLYETHYLENESpolymerizationnesPOLYMERIZATION CATALYSISLPOLYMERIZATION CATALYSTS polymerization ofpolymerization rateetPOLYMERIZATIONSZA POLYMERSMpolymethylaluminoxane POLYOLEFINSEC polypropylenePOLYPROPYLENESLYS polysilaneesoPOLYSILANE HIGH POLYMERSMPOOLI potassiumPRACTICAL ACCESSYPRACTICAL TOOLEXG PRECURSORSPOL PRIMARYANPRIMARY ORGANOSILANES PROCEDUREPROMOTED CYCLIZATIONO PROPAGATION C PROPENEETPROPENE POLYMERIZATIONSTS propiolactami PROPYLENEPROPYLENE POLYMERIZATIONEPROPYLENE POLYMERIZATIONS protonationsPSEUDOROTATIONTIO pyridineo PYRIDINES quantumizR =PERAYEN RAY CRYSTAL-ERAY CRYSTAL-STRUCTURERAY CRYSTAL-STRUCTURESnYRAY MOLECULAR-STRUCTURESl ray structureraysi REACTIONT reactions REACTIVITYE REAGENTST REARRANGEMENT REDUCTIONREGIOSELECTIVE REACTIONS RELEVANCE RETENTIONRHECTrheological propertiesRINGORING CYCLIC CUMULENES ring-opening polymerizationmROUTEsalicylaldiminato ligands SANDWICHCsandwich complexesӐsandwich compoundsӐ SCATTERINGIN SCHIFF-POSELECTIVE EPOXIDATIONSELECTIVE HYDROSILYLATIONSEMI-CRYSTALLINE POLYMERS semiempiricalSEPARATED ION-PAIRSDI SERIESTIV SI BONDSC SIDE-CHAINRUC SIGMA-OCESIGMA-ALKENYL COMPLEX SILABENZENEE SILACYCLOPENTADIENYL ANIONZ SILANES C siloxyatosilylSILYL HYDRIDE COMPLEXESEM("SILYL-SUBSTITUTED CYCLOPENTADIENYLSIME3/0162t"r154-159LEHalterman, R. L. Fahey, D. R. Marin, V. P. Dockter, D. W. Khan, M. A.zSynthesis, characterization and polymerization properties of isopropylidene(eta(5)-3-neomenthylcyclopentadienyl)(eta(5)- fluorenyl)-zirconium dichloride*#Journal of Organometallic ChemistrynHAzirconocene dichloride; metallocene catalyzed polymerization polypropylene; neomenthylcyclopentadienyl; chiral metallocene; fulvene; fluorenyl; cyclopentadienyl ALPHA-OLEFIN POLYMERIZATION; METALLOCENE CATALYSTS; GROUP-4 METALLOCENES; MECHANISTIC ASPECTS; ANCILLARY LIGAND; POLYPROPYLENE; MICROSTRUCTURE; COMPLEXES; METALThe reaction of neomenthylcyclopentadiene with acetone solution led to 6,6-dimethyl-3-neomenthylfulvene (6). The bridged 3- neomenthylcyclopentadienyl-2-fluorenylpropane (7) has been isolated after reaction of 6 with fluorenyllithium salt. The reaction of ZrCl4 with the dilithium salt of 7 in diethyl ether yields the complex isopropylidene(eta (5)-3-neomenthylCp)-(eta (5)-9-fluorenyl)ZrCl2 (4) as a 60:40 mixture of diastereomers. The complex was fully characterized by single-crystal X-ray diffraction and NMR methods. Complex 4 is an active catalyst for the homogeneous polymerization of propylene when activated by methylaluminoxane methods (MAO). The polypropylene polymer produced with 4 has lower molecular weight and a lower degree of syndiotactic or hemiisotactic stereoregularity, but a higher degree of isotactic character (mm tried of 63%) than the polymer produced with the syndiospecific catalyst isopropylidene(Cp)(Flu)ZrCl2 (la) under these conditions. (C) 2001 Elsevier Science B.V. All rights reserved.J. Organomet. Chem. 2001 6252APR 22 J ORGANOMET CHEMISI:000168575100004 5543-5546.'Hanawa, H. Kii, S. Asao, N. Maruoka, K.d^XBis-zirconium and bis-hafnium catalysts for the strong activation of carbonyl substratesTetrahedron Letters Tetrahedron Lett. 20004129JUL 15 TETRAHEDRON LETT8ISI:0000882002000231 1146-1149z("Hara, M. Hayakawa, R. Watanabe, K.2,Hydrogen-induced disproportionation of Zr2Co Materials Transactions JimMater. Trans. JIM  2000419 SEP MATER TRANS JIMmISI:000165139700011e143-154dLFHarder, S. Brandsma, L. Kanters, J. A. Duisenberg, A. Vanlenthe, J. H.\VThe Structure of 2-(Diphenylphosphino)Phenyllithium - the Significance of P-Li Bonding*#Journal of Organometallic Chemistryo CHEMISTRYe The solid state structure of 2- (diphenylphosphino)phenyllithium.Et2O has been determined by a single crystal X-ray diffraction study. The crystal consists of dimeric aggregates in which the Li atoms are solvated by an additional diethyl ether molecule. The compound retains the dimeric structure in an apolar solvent (toluene) but in THF it exists in monomeric form. Ab initio calculations indicate a small but significant influence of P-Li interaction on the stability and structure of P-containing organolithium compounds.J. Organomet. Chem. 1991 4202DEC 3 J ORGANOMETAL CHEMISI:A1991GU64000001 1066-1068r"Harder, S. Streitwieser, A.t^W1st Structure of a Mixed Organosodium Lithium Alkoxide Compound - Model for a Superbase82Angewandte Chemie-International Edition in English@9RAY CRYSTAL-STRUCTURES; TETRAHYDROFURAN SOLUTION; COMPLEXiLi-O interactions dominate the structure of 1, a molecule that contains the M-C and Li-O functionalities suspected to play a role in superbases involving RLi and R'OM (M = Na, K, Rb, Cs). Compound 1 forms a tmeda-coordinated tetramer with a central Li4O4 cube, and its O atoms have tetragonal-pyramidal coordination. This structure offers a possible explanation of the activation of organolithium compounds by alkali metal alkoxides.$Angew. Chem.-Int. Edit. Engl. 1993327JUL ANGEW CHEM INT EDISI:A1993LP90000029 1744-1746r Harder, S. Prosenc, M. H.>7The Simplest Metallocene Sandwich - the Lithocene AnionL82Angewandte Chemie-International Edition in EnglishnhCRYSTAL-STRUCTURE; LITHIUM CYCLOPENTADIENIDE; COMPLEXES; TEMPERATURE; GEOMETRY; COMPOUND; SODIUM; CATION$Angew. Chem.-Int. Edit. Engl.0 19943317SEP 16 ANGEW CHEM INT EDISI:A1994PH88500013c 2133-2135L$Harder, S. Lutz, M. Kremer, T.XRCrystal-Structure of a Carbanion-Amide Combination with Lithium and Sodium-CationsOrganometallicsfhbMETAL-ALKYL; MOLECULAR-STRUCTURES; KETONE ENOLATE; ARYL COMPOUNDS; REACTIVITY; COMPLEX; STACK; NMRIn analogy with RLi/MOR' (M = Na, K, Rb, Cs) superbases, metal exchange in mixtures of (RLi)(2) and (MNR'(2))(2) to give (RM)(2) and (LiNR'(2))(2) is calculated to be exothermic. A small energy difference between complete metal exchange and the formation of mixed aggregates, RM/LiNR'(2), suggests a significant role of the latter. We prepared a mixed Li/Na carbanion-amide and studied the structure by single-crystal X- ray diffraction. The structure of this Li/Na carbanion-amide complex can. be described as a tetrameric cluster from units in which Li and Na cations bridge the carbanion and amide functionalities. The carbanion-amide bonding interactions with the Li cations are of major importance, whereas the Na cations are involved in weaker bonding. The different influence of amide anions and alkoxide anions on the structure of mixed aggregates provoked a comparative study on the superbasic properties of such systems.Organometallics 1995145MAY ORGANOMETALLICSISI:A1995QX798000030:3pvS536-545 .(Fryzuk, M. D. Duval, P. B. Rettig, S. J.Formation and reactivity of the zirconium ethylene complexes [eta(5)-C5H3-1,3-(SiMe2CH2PR2)(2)]Zr(eta(2)-CH2=CH2)(X) (R = Me, Pr (i); X = Br, C5H5)>8Canadian Journal of Chemistry-Revue Canadienne De Chimiezirconium; cyclopentadienyl phosphine; alkyne; metallocyclopropane CRYSTAL-STRUCTURE; DERIVATIVES; CHEMISTRY; CARBONYL; TITANIUM; NORBORNENE; LIGANDS; METALS; ALKENE; SIME3LFThe formation and reactivity of the zirconium ethylene complexes (R)[P2Cp]Zr(eta (2)-CH2=CH2)(X) (2a: R = Pr-i, X = Br; 2b: R = Me, X = Br; 4a: R = Pr-i, X = C5H5; (R)[P2Cp] = (eta (5)-C5H3-1,3-(SiMe2CH2PR2)(2))) are described. Ethylene complexes 2a and 2b are prepared from a reaction of (R)[P2Cp]ZrCl3 (1a: R = Pr-i; 1b: R = Me) with 2 equiv of EtMgBr, presumably via beta-H elimination from the diethyl intermediate (R)[P2Cp]ZrCl(CH2CH3)(2). The structure of 2b was determined by X-ray crystallography. Addition of carbon monoxide to 16-electron 2 displaces the ethylene ligand to generate the carbonyl complex (R)[P2Cp]Zr(CO)(2)Br (5a: R = Pr- i; 5b: R = Me), which is stable only under an atmosphere of CO. The corresponding CO reaction with 18-electron 4a to give the metallocene monocarbonyl analogue (Pr)[P2Cp]Zr(eta (5)- C5H5)(CO) (6a) is considerably slower. 2a exhibits fluxional exchange of one carbonyl ligand with bulk (CO)-C-13 in solution; the kinetic parameters for this exchange process are DeltaH(double dagger) = 9.2(5) kcal mol(-1) and DeltaS(double dagger) = -17(2) cal mol(-1) K-1. The addition of diphenylacetylene to 2a yields the alkyne complex (Pr)[P2Cp]Zr(eta (2)-PhCCPh)Br (7a), which exists in solution as two isomers in equilibrium. A solid-state X-ray structure determination for the minor isomer syn-7a was performed.$Can. J. Chem.-Rev. Can. Chim.t 2001795fMAY CAN J CHEMISI:000170070900011o637-640.$Fukui, Y. Murata, M. Soga, K.i^WLiving polymerization of propylene and 1-hexene using bis-Cp type metallocene catalystsd*#Macromolecular Rapid CommunicationssNHALPHA-OLEFINS; TITANIUM; CYCLOPENTADIENYL; ZIRCONIUM; COMPLEXES; HAFNIUMTo check the possibility of living polymerization with a biscyclopentadienyl metallocene, propylene polymerization was conducted by Cp2ZrMe2 at -78 degrees C or Cp2HfMe2 at -50 degrees C using B(C6F5)(3) and AlOct(3) as a cocatalyst. The polymer yield increased linearly with polymerization time. The polypropylene obtained showed narrow molecular weight distribution ((M) over bar(w)/(M) over bar(n) 1.04-1.15). In addition, the number-average molecular weight increased in proportion to the polymerization time. It was, thus, found that living polymerization of propylene proceeds with the catalyst systems at a very low temperature. Isospecific living polymerization of 1-hexene also proceeded with the rac- (et)Ind(2)ZrMe(2) catalyst at -78 degrees C.Macromol. Rapid Commun. 19992012 DEC MACROMOL RAPID COMMUNISI:000084309600009 2134-2134txqGallucci, J. C. Gobley, O. Zaegel, F. Meunier, P. Gautheron, B. Lange, H. Gleiter, R. Kozmina, N. Paquette, L. A.jcSolid-state structural analysis of the "naked" isodicyclopentadienide anion. (vol 17, pg 112, 1998) OrganometallicsOrganometallics 19981710MAY 11 ORGANOMETALLICSISI:000073789900037387-392N>7Galsworthy, J. R. Green, M. L. H. Maxted, N. Muller, M.iSynthesis and crystal structure of the tris(amide) cations [M{N(SiMe3)(2)}(3)](+) (M = Zr or Hf): evidence for M-Si-C interactions:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.E 19983:$FEB 7 J CHEM SOC DALTON TRANS9ISI:000072111100012 2029-2034>8Gambarotta, S. Floriani, C. Chiesivilla, A. Guastini, C.piHydrazonato Ligands from the Insertion of Diazoalkanes into Zirconium Carbon and Zirconium Hydrogen-BondsInorganic Chemistry Inorg. Chem. 19832214 INORG CHEMISI:A1983QY22400019r bar(n) 1.04-1.15). In addition, the number-average molecular weight increased in proportion to the polymerization time. It was, thus, found that living polymerization of propylene proceeds with the catalyst systems at a very low temperature. Isospecific living polymerization of 1-hexene also proceeded with the rac- (et)Ind(2)ZrMe(2) catalyst at -78 degrees C.Macromol. Rapid Commun. 19992012 DEC MACROMOL RAPID COMMUNISI:000084309600009 2134-2134txqGallucci, J. C. Gobley, O. Zaegel, F. Meunier, P. Gautheron, B. Lange, H. Gleiter, R. Kozmina, N. Paquette, L. A.jcSolid-state structural analysis of the "naked" isodicyclopentadienide anion. (vol 17, pg 112, 1998) OrganometallicsOrganometallics 19981710MAY 11 ORGANOMETALLICSISI:000073789900037387-392N>7Galsworthy, J. R. Green, M. L. H. Maxted, N. Muller, M.iSynthesis and crystal structure of the tris(amide) cations [M{N(SiMe3)(2)}(3)](+) (M = Zr or Hf): evidence for M-Si-C interactions:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans.E 19983:$FEB 7 J CHEM SOC DALTON TRANS9ISI:000072111100012 2029-2034>8Gambarotta, S. Floriani, C. Chiesivilla, A. Guastini, C.piHydrazonato Ligands from the Insertion of Diazoalkanes into Zirconium Carbon and Zirconium Hydrogen-BondsInorganic Chemistry Inorg. Chem. 19832214 INORG CHEMISI:A1983QY22400019 BRP^5.P6&#190-195K(!Wipf, H. Kappesser, B. Werner, R.r<5Hydrogen diffusion in titanium and zirconium hydrides &Journal of Alloys and CompoundsyJ. Alloy. Compd. 2000 310  SEP 28 J ALLOYS COMPOUNDSISI:000089480800042t195-204.TNWitte, P. T. Klein, R. Kooijman, H. Spek, A. L. Polasek, M. Varga, V. Mach, K.Electron transfer in the reactions of titanocene- bis(trimethylsilyl) acetylene complexes with 2,2'-bipyridine and 4,5-diazafluorene. The crystal structure of (4,5- diazafluorenyl)bis(pentamethylcyclopentadienyl)titanium(III)*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1996 519 1-2 JUL 26 J ORGANOMETAL CHEMISI:A1996UW80900021293-301.,%Wloka, M. Troyanov, S. I. Kemnitz, E.NVPNew zirconium phosphate fluorides: Hydrothermal synthesis and crystal structures& Journal of Solid State ChemistryJ. Solid State Chem. 1998 1352FEB 1 J SOLID STATE CHEMISI:000072900200013 1028-1032N,%Wloka, M. Troyanov, S. I. Kemnitz, E.K:3New zirconium phosphate fluorides with 3D-frameworko82Zeitschrift Fur Anorganische Und Allgemeine ChemieZ. Anorg. Allg. Chem.i 1999 625f6aJUN Z ANORG ALLG CHEMlISI:000080696300029e 21-27.,%Wloka, M. Troyanov, S. I. Kemnitz, E.VjdSynthesis and crystal structures of zirconium phosphate fluorides with new 2D and 3D structure types& Journal of Solid State ChemistryJ. Solid State Chem. 2000 1491oJAN J SOLID STATE CHEMISI:000085229200003f793-799&Wolczanski, P. T. Bercaw, J. E.oRKAlkyl and Hydride Derivatives of (Pentamethylcyclopentadienyl)Zirconium(Iv)OrganometallicsOrganometallics 1982169ORGANOMETALLICStISI:A1982NZ18500006 4535-4551KWolf, W. Herzig, P.PFirst-principles investigations of transition metal dihydrides, TH2 : T = Sc, Ti, V, Y, Zr, Nb; energetics and chemical bonding*#Journal of Physics-Condensed Matter J. Phys.-Condes. Matter1 20001221"MAY 29 J PHYS-CONDENS MATTERISI:000087788300004 4593-4597@:Wong, W. K. Zhang, L. L. Wong, W. T. Xue, F. Mak, T. C. W.Synthesis and X-ray crystal structures of [Ph(2)PMe(2)][(eta(5)-C(5)H(4)Bu(t))(2)Li] and [(eta(5)- C(5)H(4)Bu(t))(2)Yb(Cl)CH2P(Me)Ph(2)] Polyhedron`ZORGANOMETALLIC COMPOUNDS; SOLUTION DYNAMICS; LITHOCENE ANION; COMPLEXES; CHEMISTRY; YLIDESThe interaction of [(eta(5)-C(5)H(4)Bu(t))(2)YbCl . LiCl] with one equivalent of Li[(CH2) (CH2)PPh(2)] in tetrahydrofuran gave [Ph(2)PMe(2)][(eta(5)-C(5)H(4)Bu(t))(2)Li] (1) and [(eta(5)- C(5)H(4)Bu(t))(2) Yb(Cl)CH2P(Me)Ph(2)] (2) in 10% and 30% yields, respectively. 1 could also be prepared in 70% yield from the reaction of [Ph(2)PMe(2)][CF3SO3] with two equivalents of (C(5)H(4)Bu(t))Li. Both compounds have been fully characterized by analytical, spectroscopic and X-ray diffraction methods. The solid state structure of 1 reveals a sandwich structure for the [(eta(5)-C(5)H(4)Bu(t))(2)Li](-) anion. Copyright (C) 1996 Elsevier Science Ltd Polyhedron 19961524 POLYHEDRONISI:A1996VM01700035 5867-5868G*$Wu, Z. Jordan, R. F. Petersen, J. L.Models for the Elusive Cp(2)Zr(R)(Olefin)(+) - Characterization of the D(0) Metal Olefin Complex Cp(2)Zr(Ocme(2)Ch(2)Ch(2)Ch=Ch2)(+).(Journal of the American Chemical SocietyJ. Am. Chem. Soc.a 1995 11721MAY 31 J AMER CHEM SOCISI:A1995RB09300033("Xi, Z. F., Hara, R., Takahashi, T. 1995^WHighly selective and practical alkyne-alkyne cross-coupling using Cp2ZrBu2 and ethylene\"Journal of Organic Chemistry6014 4444-4448r 40-48l$Xiao, L. Umakoshi, Y. Sun, J.~xBiaxial low cycle fatigue properties and dislocation substructures of zircaloy-4 under in-phase and out-of-phase loadinghaMaterials Science and Engineering a-Structural Materials Properties Microstructure and ProcessingcD=Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.N 2000 29201*#NOV 15 MATER SCI ENG A-STRUCT MATERISI:000089985900006 3105-3108hD>Yamazaki, A. Nishihara, Y. Nakajima, K. Hara, R. Takahashi, T.~xPreparation and characterization of bis(cyclopentadienyl)zirconium(II) complexes with a tethered olefin-phosphine ligandOrganometallicsOrganometallics 19991816AUG 2 ORGANOMETALLICSCISI:000081997400026S 2091-2099<6Yan, X. F. Chernega, A. N. Metzler, N. Green, M. L. H.XQSynthesis of new amido, alkoxo and eta-cyclopentadienyl derivatives of molybdenum:3Journal of the Chemical Society-Dalton Transactions"J. Chem. Soc.-Dalton Trans. 199712$JUN 21 J CHEM SOC DALTON TRANSISI:A1997XH76600015r<F[<LH8%g0|T7 2609-2612 voMach, K. Hiller, J. Thewalt, U. Sivik, M. R. Bzowej, E. I. Paquette, L. A. Zaegel, F. Meunier, P. Gautheron, B.|vStereoselective Redox Reaction of Isodicyclopentadiene with the Bis(Tetrachloroaluminato)(Benzene)Titanium(Ii) ComplexOrganometallicsHA= 0-4 COMPLEXES; CRYSTAL-STRUCTURE; TITANOCENE; CHEMISTRY; LIGANDRedox reaction of isodicyclopentadiene (isodiCpH, tricyclo[5.2.1.0(2.6)]deca-2,5-diene) with the (benzene)Ti-II complex (eta(6)-C6H6)Ti[(mu-Cl)(2)AlCl2](2) (1) affords exclusively the exo-faced (isodicyclopentadienyl)Ti-III complex (eta(5)-C10H11)Ti[(mu-Cl)(2)AlCl2](2) (2). The X-ray crystal analysis of 2 (monoclinic, P2(1)/m, No. 11, a = 7.006(1) Angstrom, b = 17.351(3) Angstrom, c = 8.346(2) Angstrom, beta = 100.30(1)degrees, Z = 2) revealed a square pyramidal coordination around the Ti(III) atom with four bridging chlorine atoms forming the pyramid base and an eta(5)- coordinated isodiCp at its apex. The molecular plane of symmetry is perpendicular to the plane containing the Ti atom and both Al atoms and bisects the isodiCp ligand.Organometallics 1995145MAY ORGANOMETALLICSISI:A1995QX79800072219-221.@:Makarov, A. V. Ganin, V. V. Troyanov, S. I. Nikitin, O. T.LEMass-Spectrometric Investigation of Vapor over Zirconium Monochloride81Vestnik Moskovskogo Universiteta Seriya 2 Khimiyah*#Vestn. Mosk. Univ. Seriya 2 Khimiya. 1986262"MAR-APR VESTN MOSK UNIV KHIMISI:A1986D284400024F613-616E>8Mala, A. Srivastava, A. K. Pandey, O. P. Sengupta, S. K.Reactions of bis(cyclopentadienyl)titanium(IV) and zirconium(IV) chlorides with 1,1 '-diacetylferrocenyl bis(hydrazones). Formation of trimetallic derivatives Transition Metal ChemistryTransit. Met. Chem.Y 20002569DEC TRANSIT METAL CHEMISI:0000891507000010& Manriquez, J. M. , Bercaw, J. E. 1974Preparation of a Dinitrogen complex of bis(pentamethylcyclopentadienyl)zirconium(II). Isolation and protonation leading to stoichiometric reduction of dinitrogen to hydrazine*$Journal of American Chemical Society9619 6229-6230225-236HAMansel, S. Rief, U. Prosenc, M. H. Kirsten, R. Brintzinger, H. H.ansa-metallocene derivatives .32. Zirconocene complexes with a spirosilane bridge: Syntheses, crystal structures and properties as olefin polymerization catalysts*#Journal of Organometallic ChemistryaJ. Organomet. Chem.c 1996 512 1-2O APR 19 J ORGANOMETAL CHEMISI:A1996UN56800030 2886-2890aVPMansel, S. Thomas, D. Lefeber, C. Heller, D. Kempe, R. Baumann, W. Rosenthal, U.Stable rac-[1,2-ethylene-1,1'-bis(eta(5)-tetrahydroindenyl)]- zirconacyclopentanes. Syntheses, X-ray crystal structures, stability, and catalysis of ethylene polymerizationOrganometallicsnZTZIRCONOCENE COMPLEXES; METAL-COMPLEXES; ALKENE; ORGANOZIRCONIUM; CYCLIZATION; DIENESThe reaction of rac-(ebthi)Zr(eta(2)-Me3SiC2SiMe3) (1) [ebthi = 1,2-ethylene-1,1'-bis(eta(5)-tetrahydroindenyl)] with an excess of ethylene at room temperature leads to the corresponding zirconacyclopentane 3, which was isolated as stable yellow crystals and characterized by an X-ray crystal structure analysis. At 203 K complex 1 reacts with only 1 equiv of ethylene to form the zirconacyclopentene 2, possibly an intermediate in the reaction from 1 to 3. Upon activation with tris(pentafluorophenyl)borane under an ethylene atmosphere, complex 3 was shown to be an effective catalyst for ethylene polymerization. The reaction of 2 equiv of styrene with the alkyne complex 1 leads to the unsymmetrically substituted zirconacyclopentane 6.Organometallics 19971613JUN 24 ORGANOMETALLICSISI:A1997XG56200020304-307.2,Marchi, C. Igau, A. Majoral, J. P. Buono, G.b[Selective P-N bond cleavage in chiral triquinphosphoranes promoted by zirconocene complexes *#Journal of Organometallic Chemistryrphosphoranes; chiral phosphanes; zirconium; metallocene; opening reaction TURNSTILE ROTATION; RING; PSEUDOROTATION; STEREOCHEMISTRY; APICOPHILICITY; PHOSPHORANES; DISPLACEMENT; ZIRCONIUMChiral bicyclic phosphanes incorporating a five- and an eight- membered ring were prepared via selective P-N bond cleavage of chiral triquinphosphoranes induced by dimethylzirconocene Cp2ZrMe2 or diphenylzirconocene Cp2ZrMe2. (C) 2000 Elsevier Science S.A. All rights reserved.J. Organomet. Chem. 2000 5992 APR 15 J ORGANOMETAL CHEMISI:000086737800026$Martin,A. Mena,M. Palacios,F. 1994bis(mu!2$-Chloro)-tetrachloro-bis(eta$5!-pentamethyl-cyclopentadienyl)-di-zircon Aqua-(eta$5!-(2-methoxyethyl)-cyclopentadienyl)-trichloro-zirconium tetrahydrofutJ.Organomet.Chem.t 480z C10RIYHAI, POSZIG347-352E:3Matsubayashi, G. E. Nakano, M. Saito, K. Tamura, H.ohbElectrical conductivities of oxidized eta(5)-cyclo-pentadienyl- metal complexes with C8H4S8 ligand,&Molecular Crystals and Liquid Crystals Mol. Cryst. Liquid Cryst.. 2000 3430MOL CRYST LIQUID CRYSTISI:000089196100005S554-555TNMatsui, S. Mitani, M. Saito, J. Matsukawa, N. Tanaka, H. Nakano, T. Fujita, T.|uPost-metallocenes: Catalytic perfomance of new bis(salicylaldiminato) zirconium complexes for ethylene polymerizationChemistry Lettersa Chem. Lett.P 20005:MAY 5 CHEM LETT8ISI:000087378400057N 51-58.60Mattheis, C. van der Zeijden, A. A. Frohlich, R.^XMonocyclopentadienyl and mono(2-methoxyethylcyclopentadienyl) zirconium methyl complexes*#Journal of Organometallic Chemistry J. Organomet. Chem.e 2000 602 1-2oMAY 15 J ORGANOMET CHEM0ISI:000087713900008U 1830-1831cMaye, J. P. Negishi, E.IConvenient Synthesis of Diene Zirconocenes and Regioselective Partial Reduction of the More Highly Substituted Double-Bonds of Conjugated Dienes Via Complexation with Zirconocenes and Protonolysis>7Journal of the Chemical Society-Chemical CommunicationsD>METAL-PROMOTED CYCLIZATION; ZIRCONIUM; ALKENES; ENYNES; DIYNESXRConjugated dienes can be initially converted to their zirconocene complexes most conveniently by their reaction with (C5H5)2ZrCl2 and freshly ground Mg; the resultant complexes can then be protonolysed with 3 mol dm-3 HCl to give regioselectively monoenes corresponding to partial hydrogenation of the more highly substituted double bond."J. Chem. Soc.-Chem. Commun.N 199324$DEC 21 J CHEM SOC CHEM COMMUNHISI:A1993MQ72300024L 3359-3362,Maye, J. P. Negishi, E.ItmConversion of Nonconjugated Dienes into Conjugated Diene- Zirconocenes Via Multipositional RegioisomerizationTetrahedron LettershaMETAL-PROMOTED CYCLIZATION; ZIRCONIUM; ALKENES; BICYCLIZATION; COMPLEXES; H-1-NMR; ENYNES; DIYNESAThe reaction of n-Bu2ZrCp2 with non-conjugated dienes (1) containing a mono- or 1,2-disubstituted alkene at one end and a 1,1,-di- or trisubstituted alkene at the other gives conjugated diene-zirconocenes 2 via multipositional regioisomerization.Tetrahedron Lett. 19933421MAY 21 TETRAHEDRON LETTISI:A1993LD79500002e185-188.@:Mazo, G. N. Rybakov, V. B. Ilinskii, A. L. Troyanov, S. I.tmSynthesis and Structure of Tetrachloro(Ortho-Phenanthrolin)- Zirconium and Products of Its Partial Hydrolysisa Koordinatsionnaya KhimiyaKoord. Khimiya 1990162G KOORD KHIMISI:A1990CP889000069" Negishi1985 Negishi1986 Negishi1987 Negishi1989 Negishi1989 Negishi1990 Negishi1991 Negishi1991 Negishi1991 Negishi1991 Negishi1993 Negishi1993 Negishi1993 Negishi1993 Negishi1994 Negishi1994 Negishi1995 Negishi1995 Negishi1995 Negishi1996 Negishi1996 Negishi1996 Negishi1996 Negishi1997 Negishi1997 Negishi1997y Negishi1998 Negishi1998 Negishi1998 Negishi1998 Negishi1998 Negishi1999d Negishi2000 Negishi2001| Neugebauer2001iE Neumann1997 Neumann19977 Neumann2001s Neumann2001 Neumuller2000. Neuner1998 Nguyen19939 Nguyen20010|Niccolai20010Nicholas20000j Nielsen-Marsh1992% Nifant'ev1998gNifantev19877`Nifantev19898 Nikitin1986 Nikitin1989 Nikitin1990 Nishihara1997 Nishihara1999Nissinen2000Nissinen2000 Nitto1990 Nitto1991 Noda19971 Noe1993 Noh2000v Noh2001 Nolt19939 Nolte1993 Noltemeyer1994f Noltemeyer1994fr Noltemeyer1996f Noltemeyer1996f Noltemeyer1997x Noltemeyer2001 Nomura2000 Norton19866 Norton19899 Norton2000& O'Donoghue1999% Obert1999` Oh19999w Ohare1991 Ohare19949 Ohare1997 Ohff1993 Ohff1993 Ohff1994 Ohff19959 Ohff19959 Ohff19969 Ohff19969 Ohiff1996 Oishi2000 Okuda1997Z Okuda2000 Okuda2000> Olbrich1996' Olbrich1997; Olbrich1999B Olbrich1999 Olivier1992 Ono2000! Optov2000 Orive2001 Oro-Sole2000 Osnes2000 Ostanin2000 Otani2000] Otero1999X Otero2000 Otero2000 Otero2001 Ott2000( Overby1997r Owuor1998j Owuor1999 Oya2000G Ozarowski1995 Ozawa2000+ Padilla1995* Pagenkopf1995Pakkanen20010 Palacin2000Palacios19888Palacios1994rH Pallavicini1990C Pallavicini1991H Pampaloni1990C Pampaloni1991= Pampaloni1992$ Pampaloni1996 Pampaloni1999 Pandey20002 Pandey20002 Panin2000 Panin2000# Papasergio1984fp Pappalardo1995V9Paquette199447Paquette1995Paquette199883Paquette19988Paquette2000 Park2000 Park2000 Park2000 Park2000+ Parrahake1995Y Parvez2000Pasturel2000y Patrick2001 Patterson1980D Pauer1991 Pauer1994 Paukov1986 Pauson19539 Pellecchia1994p Pellecchia1995VB Pellinghelli1991+ Pellinghelli1995X Pellinghelli20000 Pellny1999 Pellny19999 Pellny19992 Pellny2000 Pellny2000 Pellny20000 Pellny2000 Pellny20000 Pellny20000 Pellny2000 Peng20000Penlidis2000 Perrichon2000Petersen1981CPetersen1983DPetersen19919 Petersen1992 Petersen19931Petersen1995Petersen1995Petersen19959kPetersen19969lPetersen19969Petersen199793Peterson1993 Petit2000  Petrukhina1999? Petrusova1996! Petrusova1997 Petrusova1999Peulecke1996Peulecke1996Peulecke1997Peulecke2000V Pez1979 Pflug2000Phillips2001Q Philson1988 Pichon19899v Pichon19911/ Pickett1981Y Piers2000 Pindado1997 Pindado1997f Pindado1998 Pindado1999 Pindado19993FE 4247-42566,&Fermin, M. C. Ho, J. W. Stephan, D. W.jdSterically Induced P-C Bond-Cleavage - Routes to Substituent- Free Phosphorus Complexes of ZirconiumOrganometallicsZIRCONOCENE THIOALDEHYDE COMPLEXES; H ACTIVATION; TRAPPING REACTIONS; MEDIATED SYNTHESIS; GENERATION; REACTIVITY; LIGAND; INSERTION; PHOSPHIDE; CHEMISTRYThe reaction of Cp(2)ZrHCl with 1 equiv of K[PH(C6H2-2,4,6-t- Bu(3))] and excess KH in THF yields the dark red product [Cp(2)ZrH(P(C6H2-2,4,6-t-Bu(3)))K(THF)(2)](2), 4. The complex Cp*Zr-2(PH(C6H2-2,4,6-t-Bu(3)))Cl, 5, is derived from the reaction of Cp*2ZrCl2 with KPH(C6H2-2,4,6-t-Bu(3)). Generation of 5 via the reaction of Cp*2ZrCl2 with excess KH and phosphine results in P-C bond cleavage as evidenced by the formation of the diamagnetic species (Cp*Zr-2)(2)(mu-P-2), 6, and the paramagnetic compound (Cp*Zr-2)(2)(mu-P), 7. Compound 7 is the first dimetallaphosphallene to be structurally characterized. In an alternate synthetic route, reaction of 2 equiv of PH2(C6H2-2,4,6-t-Bu(3)) with (Cp*Zr-2(N-2))(2)(mu-N-2) yields P-C bond cleavage, as the species Cp*Zr-2[(PH)(2)], 8, is formed. Reaction of 8 with KH leads to the generation of species [Cp*Zr-2(P-2)][K(THF)(x)](2), 9, which reacts with Cp*2ZrCl2 to give 6 quantitatively. In a subsequent reaction, compound 6 undergoes reaction slowly with excess PH2(C6H2- 2,4,6-t-Bu(3)) in the presence of KH to give compound 10. X-ray crystallographic study of 10 revealed the asymmetric unit to contain Cp*2ZrP3K(THF)(1.5). This species forms an infinite polymeric structure in the solid state. The nature of the bonding in species 7, 8, and 10 has been examined via EHMO calculations. The chemistry described herein demonstrates that high steric demands may induce P-C bond cleavage, thus offering a feasible metal-mediated route to substituent-free P complexes.OrganometallicsS 1995149oSEP ORGANOMETALLICSrISI:A1995RU57200030 1553-1561CRKFernandez, F. J. GomezSal, P. Manzanero, A. Royo, P. Jacobsen, H. Berke, H.nbeta-Hydrogen-containing zirconium alkyls with the doubly- bridged bis(dimethylsilanediyl)dicyclopentadienyl ligand. X-ray molecular structures of [Zr{(SiMe2)(2)(eta(5)-C5H3)(2)}ClEt] and [Zr{(SiMe2)(2)(eta(5)-C5H3)(2)}Et](2)(mu-CH2=CH2)yOrganometallicstZIRCONOCENE-ALKENE COMPLEXES; METAL-PROMOTED CYCLIZATION; INHOMOGENEOUS ELECTRON-GAS; DENSITY-FUNCTIONAL THEORY; CORRELATION-ENERGY; ETHYLENE COMPLEX; PRACTICAL TOOL; POLYMERIZATION; REACTIVITY; BIS(PENTAMETHYLCYCLOPENTADIENYL)(ETHYLENE)TITANIUM(II)1rlAlkylation of [Zr(CpSi2Cp)Cl-2] (CpSi2Cp = (eta(5)- C5H3)(2)[Si(CH3)(2)](2) with 1 equiv of RMgCl in THF at 10 degrees C gave the monoalkylated complexes [Zr(CpSi2Cp)ClR] (R = Et, n-Pr, i-Pr) in 80% yield, the isopropyl complex isomerizing to the n-propyl derivative above 10 degrees C. Addition of a second equivalent or an excess amount of the akylating agent resulted in the formation of the dialkyl compounds [Zr(CpSi2Cp)R-2] (R = Et, n-Pr). Hydrolysis of [Zr(CpSi2Cp)ClR] led to the mu-oxo dinuclear complex [{Zr(CpSi2Cp)Cl}(2)(mu-O)]. Thermal decomposition of THF solutions of [Zr(CpSi2Cp)ClR] takes place with the evolution of an equimolar amount of alkane and alkene and the formation of [Zr(CpSi2Cp)Cl-2] and an unidentified residue. Formation of [Zr(CpSi2Cp)Et-2] is always accompanied by decomposition with the evolution of ethane to give [{Zr(CpSi2Cp)Et}(2)(mu- CH2=CH2)] in 70% yield. A similar behavior was observed for [Zr(CpSi2Cp)(n-Pr)(2)]. All of the compounds were characterized by elemental analysis and NMR spectroscopy, and the molecular structures of [Zr(CpSi2Cp)ClEt] and [{Zr(CpSi2Cp)Et}(2)(mu- CH2=CH2)] were studied by X-ray diffraction methods. Density functional calculations on the model compound [{ZrCp2Me}(2)(mu- CH2=CH2)] satisfactorily reproduce d(C-C) = 1.482, d1(Zr-C) = 2.327 Angstrom, and d2(Zr-C) = 2.506 Angstrom, the geometry found experimentally.Organometallics1 1997168nAPR 15 ORGANOMETALLICSISI:A1997WU31800010l147-153.0)Fernandez, F. J. Galakhov, M. V. Royo, P.gReactivity of vinyl and alkynyl zirconium complexes with the di-ansa-[1,1 ',2,2 '-bis(dimethylsilanediyl) dicyclopentadienyl] ligand*#Journal of Organometallic Chemistryzirconium; alkenyl; alkynyl; alkylzirconacycles ANSA-METALLOCENE DERIVATIVES; RAY MOLECULAR-STRUCTURES; ZIRCONOCENE COMPLEXES; CRYSTAL-STRUCTURE; CATALYSTS; POLYMERIZATION; INTERCONVERSION; REARRANGEMENT; TITANIUM; ALKENYLhbVinylation of the chloro-ethyl and dichloro zirconium complexes [Zr(CpSi2Cp)ClX] (CpSi2Cp = 1,1',2,2'-(SiMe2)(2)(eta(5)- C5H3)(2); X = Et, Cl) with one or two equivalents of Mg(CH=CH2)Cl gave the new zirconacyclopentane [Zr(CpSi2Cp){eta(2)-CH2-(CH2)(2)-CH2}] and (eta(4)- butadiene)zirconium [Zr(CpSi2Cp){eta(4)-(butadiene)}] complexes, respectively. Addition of a toluene solution of PhC=CPh to the zirconacyclopentane compound afforded the zirconacyclopentadiene derivative [Zr(CpSi2Cp){eta(2)-(CPh=CPh- CPh=CPh)}]. Reaction of the chloro-ethyl zirconium complex with LiC=CPh afforded the alkynyl compound [Zr(CpSi2Cp)Et(C=CPh)] which reacted with CN(2,6-Me2C6H3) to give the insertion product [Zr(CpSi2Cp)(C=CPh){eta(2)-C(Et)=N(2,6-Me2C6H3)}]. Reactions of the chloro-ethyl [Zr(CpSi2Cp)EtCl] and alkynyl- ethyl [Zr(CpSi2Cp)Et(C=CPh)] complexes with the Lewis acid B(C6F5)(3) yielding various cationic species have been monitored by H-1-NMR spectroscopy. The new complexes reported and their intermediates have been identified by IR and H-1- and C-13-NMR spectroscopy. (C) 2000 Elsevier Science S.A. All rights reserved.J. Organomet. Chem. 2000 5944 JAN 15 J ORGANOMETAL CHEM:ISI:000084876400021 2532-2540e4.Fischer, R. Walther, D. Gebhardt, P. Gorls, H.Reactive intermediates of the catalytic carbomagnesation reaction: Isolation and structures of [Cp2ZrEt](2)(mu-ethene), [Cp2Zr(ethene)(L)] (L = THF, pyridine), and [(indenyl)(2)Zr(ethene) (THF)] and of metallacycles with norborneneOrganometallicsOrganometallics 20001913JUN 26 ORGANOMETALLICSISI:000087804200022Z<,8 G:FZAH!FI/O. 2637-2638M0*Hitchcock, P. B. Lappert, M. F. Liu, D. S.Transformation of the Bis(Trimethylsilyl)Methyl into Aza-Allyl and Beta-Diketinimato Ligands - the X-Ray Structures of Cyclo([Li(N(R)C(Bu(T))Ch(R))](2) and Cyclo[(Zr(N(R)C(Bu(T))Chc(Ph)N(R))Cl-3] (R=Sime(3))[>7Journal of the Chemical Society-Chemical Communicationsr"J. Chem. Soc.-Chem. Commun. 199422$NOV 21 J CHEM SOC CHEM COMMUNISI:A1994PU25900050 2745-2752S<6Hitchcock, P. B. Lappert, M. F. Liu, D. S. Ryan, E. J.Ligand Redistribution Reactions as a Route to Cyclopentadienylzirconium(Iv) or 1-Aza-Allylzirconium(Iv) Trichlorides and the X-Ray Structures of [(Zr(Ll')Cl(2)(Mu- Cl))(2)] and [Zr(Ll')(2)Cl(2)] [Ll'=N(R)C(Bu(T))Chr, R=Sime(3)] Polyhedron Polyhedron 19951419SEP POLYHEDRONISI:A1995RU14700017305-308.2,Hitchcock, P. B. Lawless, G. A. Marziano, I.PIThe molecular structure of 2,2',5,5'-tetraphenyl-1,1'- diphosphaferroceneo*#Journal of Organometallic ChemistryJ. Organomet. Chem. 1997 527E 1-2 JAN 11 J ORGANOMETAL CHEM0ISI:A1997WB28600042O143-144 ,&Hitchcock, P. B. Hu, J. Lappert, M. F.New dianionic ligands eta(5)-(C)over- bar(5)H(4)Si(Me)(2)(C)over-bar(H)SiMe3 and eta(5)-(C)over- bar(5)H(4)SiMe(2){NC(Bu-t)C(H)SiMe3}(-); syntheses, structures and reactivity of their lithium and zirconium derivativesChemical Communications Chem. Commun. 19981JAN 7 CHEM COMMUNISI:000071593500069 10264-10265S4-Hitchcock, P. B. Kerton, F. M. Lawless, G. A.The elusive titanocene.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.e 1998 120 39OCT 7 J AMER CHEM SOCrISI:000076381000037s599-600 4-Hitchcock, P. B. Keates, J. M. Lawless, G. A.FB8Canadian Journal of Chemistry-Revue Canadienne De ChimieTITANIUM PHOSPHIDES; STRUCTURES; MAGNETIC PROPERTIES METAL HETEROBIMETALLIC COMPLEXES; MOLECULAR-STRUCTURE; COOPERATIVE ACTIVATION; CRYSTAL; REACTIVITY; TITANIUM; ELECTROCHEMISTRY; DERIVATIVES; TITANOCENE; ZIRCONIUMmPJThe complex [Cp2Ti(mu-PEt2)]2 (1) crystallizes in the monoclinic space group P2(1)/n with a = 16.591(3) angstrom, b = 8.662(2) angstrom, c = 37.407(2) angstrom, beta = 102.40(1)- degrees, Z = 8, and V = 5250(2) angstrom 3. The Ti2P2 core of the dimeric complex is planar and the angles at Ti and P are close to 90-degrees. The Ti...Ti separations were found to be 3.732(1) and 3.706(1) angstrom in the two independent molecules in the unit cell. Bulk magnetic susceptibility measurements on solid 1 show that the species is diamagnetic over the range 5- 340 K. The coupling constant for the antiferromagnetic interaction between the Ti centers of 1 is found to be at least -300 cm-1. Extended Huckel Molecular Orbital calculations suggest that mixing of the frontier 1a1 orbitals of the Cp2Ti fragments with the p orbitals of the phosphide fragments affords a mechanism for super-exchange through the ligands. In THF solution, variable temperature H-1, and P-31{H-1} NMR and EPR spectra for 1 are consistent with the generation of the paramagnetic monomeric species Cp2TiPEt2, 3. As well, the data suggest thermal populations of the paramagnetic triplet state of the dimer may occur to a small extent at 340 K. In contrast, the analogous Zr dimer 2 shows no evidence of dissociation or of thermal population of the triplet state at temperatures to 340 K.$Can. J. Chem.-Rev. Can. Chim.  1991697pJUL CAN J CHEMISI:A1991FY81600017y192-POLYDing, Y. W. Corey, J. Y.The Generation of High Mw Poly(Di-N-Butylstannane) from Dehydrogenative Condensation of Bu2snh2 in the Presence of Cp2mcl2 (M = Zr, Hf)/N-Buli:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1995 2101& AUG 20 2 ABSTR PAP AMER CHEM SOCISI:A1995RP25901458 3855-3858 .(Dinnebier, R. E. Behrens, U. Olbrich, F.Solid state structures of cyclopentadienyllithium, -sodium, and -potassium. Determination by high-resolution powder diffractioniOrganometallicstTMMAIN-GROUP ELEMENTS; SIMPLEST METALLOCENE; LITHOCENE ANION; ALKALI; COMPLEXEStThe structures of MCp (M = Li, Na, K; Cp = cyclopentadienyl), some of the most important precursors in, synthetic organometallic chemistry, have been, investigated. All three compounds form polymeric ''multidecker structures''. In LiCp and NaCp the metal atoms form a ''string of pearls'' whereas the potassium atoms in KCp are arranged in a zigzag chain that interacts with neighboring chains.Organometallics 19971617AUG 19 ORGANOMETALLICSISI:A1997XR55900020 2915-2918D:4Dinnebier, R. E. Neander, S. Behrens, U. Olbrich, F.LFSolid-state structures of base-free indenyllithium and fluorenylsodiumOrganometallicsOrganometallics 19991815JUL 19 ORGANOMETALLICSISI:000081625500030tallizes in the monoclinic space group P2(1)/c, with a = 8.385(2) angstrom, b = 15.958(2) angstrom, c = 14.230(4) angstrom, beta = 107.79(1)degrees, Z = 4, and V = 1813(1) angstrom 3. The geometry of the Ti coordination sphere in these complexes is best described as pseudo-tetrahedral. The structural data are consistent with Ti-N multiple bonding. Preliminary results of EHMO calculations are consistent with d- pi-p-pi Ti-N bonding. Attempts to replace the halides with phosphides (LiPR2, R = Me, Et, Ph) led not to the Ti(IV) phosphido species, but rather to redox chemistry yielding Ti(III) amides and P2R4. The barrier to rotation about the Ti- N bonds has been considered. Variable temperature H-1 NMR studies reveal that the barrier is small. Extended Huckel total energy minimization calculations have been performed. In addition, MMX calculations of the barrier to Ti-N rotation are reported. The results of these calculations imply that the rotational barrier is dominated by steric effects.$Can. J. Chem.-Rev. Can. Chim.. 1991692FEB CAN J CHEMISI:A1991FA87600027H192-POLYDing, Y. W. Corey, J. Y.The Generation of High Mw Poly(Di-N-Butylstannane) from Dehydrogenative Condensation of Bu2snh2 in the Presence of Cp2mcl2 (M = Zr, Hf)/N-Buli:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1995 2101& AUG 20 2 ABSTR PAP AMER CHEM SOCISI:A1995RP25901458 3855-3858 .(Dinnebier, R. E. Behrens, U. Olbrich, F.Solid state structures of cyclopentadienyllithium, -sodium, and -potassium. Determination by high-resolution powder diffractioniOrganometallicstTMMAIN-GROUP ELEMENTS; SIMPLEST METALLOCENE; LITHOCENE ANION; ALKALI; COMPLEXEStThe structures of MCp (M = Li, Na, K; Cp = cyclopentadienyl), some of the most important precursors in, synthetic organometallic chemistry, have been, investigated. All three compounds form polymeric ''multidecker structures''. In LiCp and NaCp the metal atoms form a ''string of pearls'' whereas the potassium atoms in KCp are arranged in a zigzag chain that interacts with neighboring chains.Organometallics 19971617AUG 19 ORGANOMETALLICSISI:A1997XR55900020 2915-2918D:4Dinnebier, R. E. Neander, S. Behrens, U. Olbrich, F.LFSolid-state structures of base-free indenyllithium and fluorenylsodiumOrganometallicsOrganometallics 19991815JUL 19 ORGANOMETALLICSISI:000081625500030    % - FUKsb. .e Au Q Ke k q  6  &' o   a  ,[ , D    q  m   < `T^" )V   S | Tb  Z;   nE  B 8A| -R C. G  6  @ l/  J7 @1PEW523-528.Basch, H. Musaev, D. G. Morokuma, K. Fryzuk, M. D. Love, J. B. Seidel, W. W. Albinati, A. Koetzle, T. F. Klooster, W. T. Mason, S. A. Eckert, J.Theoretical predictions and single-crystal neutron diffraction and inelastic neutron scattering studies on the reaction of dihydrogen with the dinuclear dinitrogen complex of zirconium [P2N2]Zr(mu-eta(2)-N-2)Zr[P2N2], P2N2=PhP(CH2SiMe2NSiMe2CH2)(2)PPh.(Journal of the American Chemical Society"HYDROGEN; FIXATION; CLEAVAGEA single-crystal neutron diffraction analysis along with density functional calculations and incoherent inelastic neutron scattering studies has conclusively shown that the dihydrogen adduct of [P2N2]Zr(mu-eta(2)-N-2)Zr[P2N2] (1) (where P2N2 = PhP(CH2SiMe2NSiMe2CH2)(2)PPh) is [P2N2]Zr(mu-eta(2)- N2H)(mu-H)Zr[P2N2] (2), the complex with a bridging hydride and a N-N-H moiety, and not the dihydrogen complex [P2N2]Zr(mu- eta(2)-N-2)(mu-eta(2)-H-2)Zr[P2N2] (3), as was proposed on the basis of X-ray crystallographic data. In addition, DFT calculations show that the reaction of 1 with both H-2 and SiH4 is exothermic while an endothermic reaction is found for the reaction of 1 with CH4.J. Am. Chem. Soc. 1999 1213JAN 27 J AMER CHEM SOCISI:000079041900006223-229 4-Bastug, T. Erkoc, S. Hirata, M. Tachimori, S.nb[Zirconium microclusters: molecular-dynamics simulations and density functional calculations Physica Ea Physica Eo 20008e34 SEP PHYSICA EaISI:000089767300004 3830-3831n.'Baumann, R. Davis, W. M. Schrock, R. R.iSynthesis of titanium and zirconium complexes that contain the tridentate diamido ligand, [((t-Bu-d(6))N-o-C6H4)(2)O](2- )([NON](2-)) and the living polymerization of 1-hexene by activated [NON]ZrMe2.(Journal of the American Chemical SocietyJ. Am. Chem. Soc. 1997 11916APR 23 J AMER CHEM SOCISI:A1997WV76800027 69-75  Baumann, R. Schrock, R. R.NMR detection of living intermediates prepared from activated [NON]ZrMe2 ([NON](2-) = [(t-Bu-d(6)-N-o-C6H4)(2)O](2-)) and olefins*#Journal of Organometallic Chemistry[J. Organomet. Chem.- 1998 557(1 APR 20 J ORGANOMETAL CHEMeISI:000073846900006s 7822-7836 F?Baumann, R. Stumpf, R. Davis, W. M. Liang, L. C. Schrock, R. R.iTitanium and zirconium complexes that contain the tridentate diamido ligands [(i-PrN-o-C6H4)(2)O](2-) ([i-PrNON](2-)) and [(C6H11N-o-C6H4)(2)O](2-) ([CyNON](2-)).(Journal of the American Chemical SocietyJ. Am. Chem. Soc.d 1999 121e34SEP 1 J AMER CHEM SOC2ISI:000082471100012c515-519.'Baumann, W. Pellny, P. M. Rosenthal, U.wDynamic NMR study of a 1,3-diyne bridged dinuclear bis(cyclopentadienyl)titanium complex: understanding the C-C single bond metathesis reaction&Magnetic Resonance in ChemistryoNMR; H-1 NMR; dynamic NMR; metallocenes; titanium; metathesis; alkynes; C-C bond activation DISUBSTITUTED 1;3-BUTADIYNES; METALLOCENE COMPLEXES; ZIRCONOCENE; CLEAVAGE; TITANOCENEpjThe coordination of 1,3-diynes as bridging ligands between two metallocene units is in many cases associated with the cleavage of their central C-C single bond. The present study was conducted with the complex [Ti (eta(5)-C5H5)(2)](2)(mu-(1,3- eta), (2,4-eta)-Me3Si-CC-CC-CMe3) (1a) which at first sight does not exhibit such a bond cleavage; H-1 and C-13 NMR studies revealed a dynamic behaviour leading to an equivalence of all four cyclopentadienyl ligands (which the solid-state structure is lacking). The most likely explanation for this invokes an equilibrium between la and an isomer with a cleaved central C-C bond and two bridging sigma, pi-alkynyl ligands that may interchange their binding function between the metal centres. This interpretation is supported by a theoretical analysis from the literature. The energetic differences between such isomeric complexes are small, so experimental conditions may shift the assumed equilibrium to either side. Examination of the H-1 NMR spectra gives Delta G(291)(double dagger) = 63 kJ mol(-1), which is in accord with theoretical predictions. The discussed equilibrium is an essential feature in the C-C single bond metathesis reaction of 1,3-diynes which is accomplished by complexation with two titanocene fragments and dissociation of the primarily formed dinuclear complexes, e.g. 1a. Copyright (C) 2000 John Wiley & Sons, Ltd.Magn. Reson. Chem. 2000387 JUL MAGN RESON CHEMaISI:000087980400007e 2177-2178r.(Bazan, G. C. Rodriguez, G. Cleary, B. P.:4Distorted Trimethylenemethane Complexes of Zirconium.(Journal of the American Chemical SocietyJ. Am. Chem. Soc.o 1994 1165aMAR 9 J AMER CHEM SOCaISI:A1994NB16900081aNFLV1VJSBR0PjZ,^]b 1667-1668 @:Cloke, F. G. N. Lappert, M. F. Lawless, G. A. Swain, A. C.Synthesis of Bis(Eta-1,3,5-Tri-T-Butylbenzene) Sandwich Complexes of Titanium, Zirconium, and Hafnium, and of the Hafnium(0) Carbonyl Complex [Hf(Eta-But3c6h3)2(Co)]s>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 198721"NOV 1 J CHEM SOC CHEM COMMUNISI:A1987K683400037:779-781MTMCloke, F. G. N. Dalby, C. I. Hitchcock, P. B. Karamallakis, H. Lawless, G. A.ePIThe 1st Structurally Authenticated Divalent Lanthanide Stannyl Derivative>7Journal of the Chemical Society-Chemical Communicationst"J. Chem. Soc.-Chem. Commun.t 199111"JUN 1 J CHEM SOC CHEM COMMUNISI:A1991FQ58900022S724-726.NGCloke, F. G. N. Hitchcock, P. B. Lappert, M. F. Lawless, G. A. Royo, B.TLipophilic Strontium and Calcium Alkyls, Amides and Phenoxides - X-Ray Structures of the Crystalline Square-Planar [(Trans- Sr(Nr'2)2(Mu-1,4-Dioxane)) Infinity] and Tetrahedral [Car2(1,4- Dioxane)2], R' = Sime3, R = Ch(Sime3)2]>7Journal of the Chemical Society-Chemical Communications"J. Chem. Soc.-Chem. Commun. 199110$MAY 15 J CHEM SOC CHEM COMMUNISI:A1991FN78200034 2414-241660Cochran, F. V. Bonitatebus, P. J. Schrock, R. R.hbMolybdenum, tungsten, and rhenium d(2) complexes that contain the C(C6F5NCH2CH2)(2)NMe](2-) ligandOrganometallicsoOrganometallicsd 20001913JUN 26 ORGANOMETALLICSISI:000087804200005112-119PJDCohen, J. D. Fryzuk, M. D. Loehr, T. M. Mylvaganam, M. Rettig, S. J.`ZSynthesis and structure of a zirconium dinitrogen complex with a side-on bridging N-2 unitInorganic ChemistryTRANSITION-METAL COMPLEXES; X-RAY; CRYSTAL-STRUCTURES; NITROGEN-FIXATION; END-ON; CHEMISTRY; LIGAND; ACTIVATION; REDUCTION; CLEAVAGE\VReduction of Zr(O-2, 6-Me2C6H3)Cl-2[N(SiMe2CH2PPr2i)(2)] with sodium amalgam under dinitrogen yields the dinuclear zirconium dinitrogen complex {[((Pr2PCH2SiMe2)-P-i)(2)N]Zr(O-2, 6- Me2C6H3)}(2)(mu-eta(2):eta(2)-N-2). Solid state structural analysis shows that the dinitrogen unit is bound in a side-on mode of coordination with the N-N bond distance at 1.528(7) Angstrom; resonance Raman spectra show a band at 751 cm(-1) for v(N-N), which is consistent with this very long bond. In addition, the N-2 ligand is hinged slightly so that the Zr- 2(mu-eta(2):eta(2)-N-2) core adopts a flattened butterfly shape rather than a completely planar core as found in other related systems. Other Zr(IV) precursors of the general formula ZrCl2X[N(SiMe2CH2PPr2i)(2)] (X = OBut, OCHPh2, NPh2) either decompose upon reduction under N-2 or produce mixtures of products. Inorg. Chem. 1998371JAN 12 INORG CHEMISI:000071475600017 2421-2422uTNConstantine, S. P. DeLima, G. M. Hitchcock, P. B. Keates, J. M. Lawless, G. A.[{Yb-6[eta-C(5)Me(4)(SiMe(2)Bu(t))](6)I-8}{Li(thf)(4)}(2)]: The spontaneous self-assembly of a hexanuclear ytterbium(II) octaiododianionChemical CommunicationsE Chem. Commun.2 199621NOV 7 CHEM COMMUN7ISI:A1996VR14800016 2337-2338TNConstantine, S. P. DeLima, G. M. Hitchcock, P. B. Keates, J. M. Lawless, G. A.TMSynthesis, structure and reactivity of ionogenic Sn(eta- Cp(R))Cl derivativesiChemical Communicationsi Chem. Commun.m 199620OCT 21 CHEM COMMUNISI:A1996VP467000160 3905-390682Constantine, S. P. Hitchcock, P. B. Lawless, G. A.|vSynthesis, characterization, and molecular structure of bis{(tert-butyldimethylsilyl)-tetramethylcyclopentadienyl}leadOrganometallicsOrganometallics 19961519SEP 17 ORGANOMETALLICSISI:A1996VH29300001  1101-1102rF@Constantine, S. P. Hitchcock, P. B. Lawless, G. A. DeLima, G. M.|uSyntheses and molecular structures of [Sn{eta- C(5)Me(4)(SiMe(2)Bu(t))}(2)] and [Fe{eta- C(5)Me(4)(SiMe(2)Bu(t))}(2)] Chemical Communications Chem. Commun.N 199610MAY 21 CHEM COMMUNISI:A1996UN96900006jConstantine, S.P.l 1997TNThe preparation and characterisation of some bis-cyclopentadienyl metallocenesSchool of CPES Brighton University of Sussex D.Phil793-795b[Constantine, S. P. DeLima, G. M. Hitchcock, P. B. Keates, J. M. Lawless, G. A. Marziano, I.nhaSynthesis and characterization of Sn(eta(5)-C(5)Me(5))Cl and Sn{eta(5)-C(5)Me(4)(SiMe(2)Bu(t))}ClOrganometallicsOrganometallics 1997164SFEB 18 ORGANOMETALLICSISI:A1997WJ33700045S317-326@:Constantine, S. P. Cox, H. Hitchcock, P. B. Lawless, G. A.81Parallel metallocenes of germanium, tin, and lead Organometallics Organometallics  2000193FEB 7 ORGANOMETALLICSISI:000085173700016 1-17Corey, J. Y. Zhu, X. H.LXQCondensation of Primary Silanes in the Presence of Cp2mcl2/Nbuli (M = Ti, Zr, Hf)*#Journal of Organometallic ChemistryJ. Organomet. Chem.  1992 43919 OCT 27 J ORGANOMETAL CHEMAISI:A1992JW3860000134-CATL.D>Corey, J. Y. Joslin, F. L. Braddockwilking, J. Thompson, L. S.LFReactions of Hydrosilanes Catalyzed by Cp2mcl2/N-Buli and Cpmcl3/Nbuli:4Abstracts of Papers of the American Chemical Society Abstr. Pap. Am. Chem. Soc. 1992 2030&APR 5 3 ABSTR PAP AMER CHEM SOC0ISI:A1992HK16301025  1121-1130,&Corey, J. Y. Huhmann, J. L. Zhu, X. H.B