β‐Ionone‐5,6‐epoxide (1) undergoes acid‐catalyzed ring contraction and enlargement, concurrently, by [1, 2]‐alkyl shifts, to give the isomeric cyclopentane derivative 6 and the cycloheptafurane derivative 7. Spectroscopic and chemical evidence for the structures of 6 and 7 is presented.
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Skorianetz et al. (1974) studied this question.
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