Dibenzo triazepines

Catalytic hydrogenation of 5//-dibenzo[r/,/][l, 2,3]triazepine gives biphenyl-2-amine (2).331... 

When 2,2 -dianiinobiphenyl is bis-diazotized at 0°C (see also Section II,A,2) and the solution is neutralized with ammonia at that temperature, dibenzo[rf,/][l,2,3]triazepine (22) precipitates as a yellow solid (Scheme 4). Although moderately stable, 22 rearranges quantitatively to benzo[c]-cinnoline-5-imide (23) on heating in benzene. The imide (23) is also the... 

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