The world is chiral. Most of the molecules in it are chiral, and asymmetric synthesis is an important means by which enantiopure chiral molecules may be obtained for study and sale. Using examples from the literature of asymmetric synthesis, this book presents a detailed analysis of the factors that govern stereoselectivity in organic reactions. After an explanation of the basic physical-organic principles governing stereoselective reactions, the authors provide a detailed, annotated glossary of stereochemical terms. A chapter on "Practical Aspects of Asymmetric Synthesis" provides a critical overview of the most common methods for the preparation of enantiomerically pure compounds, techniques for analysis of stereoisomers using chromatographic, spectroscopic, and chiroptical methods. The authors then present an overview of the most important methods in contemporary asymmetric synthesis organized by reaction type. Thus, there are four chapters on carbon-carbon bond forming reactions, one chapter on reductions, and one on oxidations (carbon-oxygen and carbon-nitrogen bond forming reactions). This organization allows the reader to compare the leading methods for asymmetric synthesis in an appropriate context. A highlight of the book is the presentation and discussion of transition states at the current level of understanding, for important reaction types. In addition, extensive tables of examples are used to give the reader an appreciation for the scope of each reaction. Finally, leading references are provided to natural product synthesis that has been accomplished using a given reaction as a key step. - Authoritative glossary to aid understanding of stereochemical terminology - Explanations of the key factors influencing stereoselectivity with numerous examples, organized by reaction type - A handy reference guide to the literature of asymmetric synthesis for practitioners in the field
Drawing on multiple disciplines with a significant interest in taxpayer compliance, Volume I critically reviews previous research on the subject, reaches conclusions and recommends future research programs to fill gaps in knowledge.
Roth assesses how Jewish legal authorities dealt with seemingly conflicting material and spiritual requirements. Analyzing two millennia of legal and intellectual history, he depicts the struggle of rabbinical authorities and scholars of the Torah to answer questions about their profession in a way that allowed the rabbinate to survive while limiting compromises with received standards. Through historical vignettes, Roth tells a story of legal ingenuity and religious courage, of flexibility in Jewish law, and of a responsiveness to changing circumstances that ultimately, although often hesitantly, laid the foundation for the modern rabbinate."--BOOK JACKET.
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