Lactones (Ia–c) undergo a ready, completely stereoselective thermal reaction with 1,1-dimethoxyethylene giving substituted α-methylene lactones in good yield.
O. L. Chapman, C. L. McIntosh and J. C. Clardy, J. Chem. Soc. D, 1971, 384 DOI: 10.1039/C29710000384
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