A concerted mechanism involving a chairlike transition state (see scheme) and no appreciable loss of enantiopurity was concluded for the anionic oxy-Cope rearrangement of sterically unencumbered trans-1,2-dialkenylcyclobutanols from a study employing nonracemic substrates containing vinyl and propenyl groups with evaluation of the enantio- and diastereofacial selectivity.
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Maurin et al. (2003) studied this question.
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