In the ‘superacid’ SbF5–HF, substituted 1,2-diphenylethanes undergo cyclisation via diprotonated species to afford in good yield tricyclic ketones containing an angular methyl group as primary products; isomerisation of these products occurs with longer reaction times.
J. Gesson and J. Jacquesy, J. Chem. Soc., Chem. Commun., 1976, 652 DOI: 10.1039/C39760000652
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