A pohotoproduct of o-azidobiphenyl in acetonitrile in the presence of tetracyanoethylene (TCNE), analysed by X-ray crystallography and high-resolution n.m.r. spectroscopy, was shown to have the spiro structure corresponding to the nucleophilic addition of 2-azacyclohepta-2,4,6-trienylidene to TCNE.
S. Murata, T. Sugawara and H. Iwamura, J. Chem. Soc., Chem. Commun., 1984, 1198 DOI: 10.1039/C39840001198
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