Treatment of 2,2′-diaminobiphenyl with pentyl nitrite or N-nitrosodiphenylamine gives the ylide (2; R = H), possibly via the triazepine (1; R = H); N-substituted derivatives also exist as the ylide (2) rather than the triazepine (1), and yield benzocinnoline and the nitrene (R–N:) on photolysis or thermolysis.
S. F. Gait, C. W. Rees and R. C. Storr, J. Chem. Soc. D, 1971, 1545 DOI: 10.1039/C29710001545
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