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.
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