On standing the title compound 1c gives an enone isomer 4 and the heptacyclic compound 5; the formation of both of these products has been rationalised in terms of the intermediacy of the bridged tropylium ion 8 and 13C-labelling studies support this proposal.
M. G. Banwell, R. W. Gable, J. H. Ryan and M. F. Mackay, J. Chem. Soc., Chem. Commun., 1994, 1015 DOI: 10.1039/C39940001015
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