Contrary to the literature data, the cyclohexenyl cation (I) rearranges to the 1-methylcyclopentenyl cation (IV) in FSO3H-SbF5(4 : 1) at –20 °C; the rate of ring contraction is much slower than the published rate of intramolecular H/D scrambling for labelled (I).
D. Fărcaşiu and L. Craine, J. Chem. Soc., Chem. Commun., 1976, 687 DOI: 10.1039/C39760000687
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