1. As discussed in the general introduction, the authors wish to make a firm distinction between a stereochemical model, which must be simple and predictive, and a physical organic mechanism for which conclusive evidence must be brought to bear on each aspect of the mechanistic proposal. The models presented here are intended to help the reader analyze and predict the stereochemical outcome of the many reactions reviewed. Few if any physical organic mechanistic studies have been performed, and therefore the stereochemical discussions in this chapter should not be considered as “true.” The interpretations are the authors' own and may differ from the original publication's author's interpretation or may be contradicted by later mechanistic studies.
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