The 4aH-benzocycloheptene (1b) rearranges at 140 °C to the 7H-benzocycloheptene (12); a pathway is suggested which involves valence tautomerism to a bisnorcaradiene intermediate, followed by a [1,5] shift of the ester group.
R. H. Bradbury, T. L. Gilchrist and C. W. Rees, J. Chem. Soc., Chem. Commun., 1979, 528 DOI: 10.1039/C39790000528
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