It is shown that certain alk-2-enyl-2,3-epoxy-3-methylcyclohexanones can be cyclised in good yield with some Lewis acids to decalone derivatives, but use of weak Lewis acids and/or nonpolar solvents leads to ring contraction.
E. Huq, M. Mellor, E. G. Scovell and J. K. Sutherland, J. Chem. Soc., Chem. Commun., 1978, 526 DOI: 10.1039/C39780000526
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