In the presence of a catalytic amount of water, 1,5-dienes undergo novel and unusual oxidation with potassium permanganate–copper sulfate in dichloromethane to give substituted butanolides in good yields under very mild conditions.
S. Baskaran, I. Islam, P. S. Vankar and S. Chandrasekaran, J. Chem. Soc., Chem. Commun., 1992, 626 DOI: 10.1039/C39920000626
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