The rearrangement of the title compound (2) in fluorosulphonic acid or sulphuric acid (98%) affords the ketone (6) in good yield whereas the ketones (2) and (6) both give rise to mixtures of the isomers (5) and (9) in sulphuric acid (90%).
N. J. Hales and H. Heaney, J. Chem. Soc., Chem. Commun., 1975, 83 DOI: 10.1039/C39750000083
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