A derivative of diethyl phenylmalonate (1) gave, on treatment with anhydrous hydrogen fluoride, a tricyclic compound (3) and not the expected benzocycloheptane derivative (2).
V. Askam and T. U. Qazi, J. Chem. Soc., Chem. Commun., 1975, 798a DOI: 10.1039/C3975000798A
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