Product analysis by X-ray crystallography has confirmed that gas-phase pyrolysis of azidopentafluorobenzene yields a diazaheptafulvalene [(E)-bi(pentafluoro-2-azacyclohepta-2,4,6-trien-1-ylidene)(1)], isolation of which affords tangible evidence for an arylnitrene → 2-azepinylidene (direct?) ring expansion.
R. E. Banks, N. D. Venayak and T. A. Hamor, J. Chem. Soc., Chem. Commun., 1980, 900 DOI: 10.1039/C39800000900
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