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According to Woodward and Hoffmann [ I ] pericyclic "is a reaction in which all first order changes in bonding relationships take place in concert on a closed curve". Because of the constraints inherent to cyclic transition states, pericyclic reactions are good candidates for stereoselective transformations. In fact most of the pericyclic reactions were found to be highly or even totally diastereoselective. Stereoselective pericyclic reactions are adequately covered by reviews [e.g. I , 21. From this vast area two topics were selected for more detailed discussion in this book, namely, asymmetric induction in cycloadditions and transfer of chirality in sigmatropic rearrangements. ### 7.1 Asymmetric Induction in Cycloadditions Cycloaddition is a process in which two or more reactants combine to form a stable cyclic molecule, during which no small fragments are eliminated and a bonds are formed but not broken [3]. The Diels-Alder reaction is a typical cycloaddition, while cyclizations involving a single molecule (e.g. electrocyclic reactions) are excluded from the definition. Cycloadditions are conveniently classified by the number of ring atoms contributed by each component to the ne

Author

Nógrádi, Mihály

Publisher

Wiley-VCH Verlag GmbH

Published

1994

Language

EN

ISBN

9781560818953