Heterosubstituted methyleneketenes undergo intermolecular [2 + 2] cycloaddition to chloral leading to α-methylenepropiolactones.
A. B. Cheikh, J. Pommelet and J. Chuche, J. Chem. Soc., Chem. Commun., 1990, 615 DOI: 10.1039/C39900000615
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