A high yield of α-methylene-γ-butyrolactones can be obtained by treatment of a 3-methoxycarbonyllactone successively with formaldehyde–dimethylamine hydrochloride, methyl iodide, and heating in dimethylformamide.
E. S. Behare and R. B. Miller, J. Chem. Soc. D, 1970, 402b DOI: 10.1039/C2970000402B
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