Decisive evidence for the occurrence of ring-expansion during pyrolysis of azidopentafluorobenzene: X-ray crystallographic analysis of ‘pentafluorophenylnitrene dimer’

Abstract
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.

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