The preparation of hitherto unreported 3-hydroxy-1,2-diphenylcyclopropene-3-carboxylates and their base-catalysed reverse benzilic acid rearrangement to diphenylcyclobutenedione are described.
C. D. DeBoer, J. Chem. Soc., Chem. Commun., 1972, 377 DOI: 10.1039/C39720000377
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