A novel mesoionic system, anhydro-4-hydroxy-1,3-dioxolium hydroxide, was formed by intramolecular carbene-carbonyl reaction on catalytic decomposition of α-diazoacetic benzoic anhydrides and trapped with acetylenic compounds to give furan derivatives as final products.
M. Hamaguchi and T. Nagai, J. Chem. Soc., Chem. Commun., 1985, 190 DOI: 10.1039/C39850000190
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