Kinetic studies establish the presence of high-energy intermediates (carbonyl ylides), which are formed by electrocyclic ring opening of the title compounds and which undergo 1,3-dipolar cycloadditions.
V. Markowski and R. Huisgen, J. Chem. Soc., Chem. Commun., 1977, 439 DOI: 10.1039/C39770000439
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