Cyclopentenones from the acid-induced ring expansion of 1-alkenylcyclopropanol derivatives

Abstract
1-Alkenylcyclopropanols (4a,b) and (5a,b) underwent acid-induced ring expansion into cyclopentenones (7), via 2-alkenylcyclobutanones (6); the 2-methylcyclopropanols (15a,b) are also synthesised using the same method.

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