Treatment of the sulphonium salt (4) with potassium t-butoxide in 1,2-dimethoxyethane results in the addition of a methylene group across the double bond to give the cyclopropyl compound (5) in high yield.
R. S. Matthews and T. E. Meteyer, J. Chem. Soc. D, 1971, 1576 DOI: 10.1039/C29710001576
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