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Conceptually different: This allyltransfer reaction is catalyzed by Lewis acids (LAs) and proceeds atom-economically by disproportionation of the carbonyl groups through organized oxonia-Cope transition states (see scheme). A stereoselective [n+4] ring enlargement leads to a variety of macrolides with 9- to 16-membered rings.
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Zou et al. (2012) studied this question.
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