Cyclopropyl epoxides, formed directly from αβ-unsaturated ketones by reaction with dimethyloxosulphonium methylide or, better, from cyclopropyl ketones by reaction with dimethylsulphonium methylide, are converted, under acidic conditions, into pent-2-ene-1,5-diols and 3,6-dihydro-2H-pyrans.
J. A. Donnelly, S. O'Brien and J. O'Grady, J. Chem. Soc., Perkin Trans. 1, 1974, 1674 DOI: 10.1039/P19740001674
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