The title compound undergoes rearrangement in trifluoroacetic acid to afford almost exclusively the benzobarrelenone (2) whereas in concentrated sulphuric acid the lactone (3) is obtained in quantitative yield.
H. Heaney and S. V. Ley, J. Chem. Soc. D, 1971, 1342 DOI: 10.1039/C29710001342
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