Treatment of methyl 1,2-dimethyl- or 1-ethyl-2-methyl-cyclohexa-2,5-diene-1-carboxylate with triphenylmethyl tetrafluoroborate caused aromatisation to the methyl 2,3-dialkylbenzoates by migration of the methoxycarbonyl group. The corresponding 1-isopropyl- and 1-benzyl-cyclohexadienes gave methyl o-toluate under the same conditions.
R. M. Acheson and R. F. Flowerday, J. Chem. Soc., Perkin Trans. 1, 1974, 2339 DOI: 10.1039/P19740002339
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