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The enthusiastic response to the first edition of Fundamentals of Organic Chemistry indicates that there are many instructors who prefer a shorter book for their two-term organic chemistry courses. Typically these courses are two-quarter or two-semester courses. In some instances, however, this book mar find use in comprehensive one-semester courses. I will point out some of the differences and the rationale for them in the following paragraphs as I describe the main features ofthis new edition. EARLY TREATMENT OF STEREOCHEMISTRY In this new edition, and in a major departure from my longer text, I have developed all of the principles of stereochemistry much earlier. In Chapter 3, I describe stereochemistry in terms of the conformations of molecules, especially emphasizing conformations of cyclohexane derivatives. In Chapter 4, I discuss molecular chirality and its consequences. In this last regard, this text points out fue distinction between chirality and stereogenicity as elaborated by K. Mislow and J. Siegel in their important publication last year. Once the principles of stereochemistry have been developed in these two chapters, they are then applied and reapplied to the chemistry of the chapters that follow. EARLY DISCUSSION OF ALCOHOLS AND ETHERS In this new edition the chemistry of alcohols and ethers is now taken up in ~ Chapter 8 instead of Chapter 15. The reason is to increase the variety of structural types covered in the first term of the course. This, too, is a departure from the first edition of this text and from my longer text. MECHANISMS ARE INTRODUCED WITH IONIC-REACTIONS Ionic reactions are much more frequently encountered in organic chemistry and are often simpIero