Thermal rearrangement of the fully-substituted azepine (VII) yields a 1,1-disubstituted cyclopentadiene (VIII): such compounds are considered to be intermediates in the thermal rearrangement of 1-substituted 1H-azepines to fulvanes where a subsequent [1,5]-sigmatropic rearrangement of the ketone-imine group is also involved.
M. Mahendran and A. W. Johnson, J. Chem. Soc. D, 1970, 10 DOI: 10.1039/C29700000010
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