Stable cycloadducts between mesoionic compounds containing a lactone moiety and olefinic dipolarophiles were isolated for the first time mesoionic 1,3-dioxolium-4-oxides, generated in situ by the intramolecular carbone–carbonyl reaction of α-diazo-acetic benzoic and -bis(acetic) anhydrides.
M. Hamaguchi and T. Nagai, J. Chem. Soc., Chem. Commun., 1985, 1319 DOI: 10.1039/C39850001319
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