The structure–rate relationships for the electrocyclic ring opening of phenylated and alkylated cyclobutenones to vinylketens, though not fully understood, resemble those which are observed in cyclobutene ring openings.
H. Mayr and R. Huisgen, J. Chem. Soc., Chem. Commun., 1976, 57 DOI: 10.1039/C39760000057
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