Base-catalysed tautomerisation of 4-methyl-2,4,6-triphenylcyclohexa-2,6-dienyl phenyl ketone (isodypnopinacolone) gives an equilibrium mixture containing 9% of α-homodypnopinacolone. This second ketone is shown to be t-4-methyl-2,c-4,6-triphenylcyclohexa-2,5-dien-r-1-yl phenyl ketone.
C. W. Alexander and J. Grimshaw, J. Chem. Soc., Perkin Trans. 1, 1972, 1372 DOI: 10.1039/P19720001372
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