2-Alkylidenecyclobutanols when heated in a sealed tube or in 5% H2SO4 undergo ring contraction to 1-alkylcyclopropyl carbonyl compounds; subsequent rearrangement into homoallylic carbonyl derivatives occurs when 1,5 hydrogen transfer is possible.
J. P. Barnier, J. M. Denis, J. R. Salaün and J. M. Conia, J. Chem. Soc., Chem. Commun., 1973, 103 DOI: 10.1039/C39730000103
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