Photolysis of cis and trans-3a,4,5,6,7,7a-hexaudro-3a-methylbenzofuran-3(2H)-one (7)in methanol gives similar mixtures of oxacarbene-derived acetals, showing that oxacarbene formation proceeds via an alkyl acyl biradical intermediate.
R. S. Grewal, D. J. Burnell and P. Yates, J. Chem. Soc., Chem. Commun., 1984, 759 DOI: 10.1039/C39840000759
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