On flash vacuum pyrolysis the nitrobiphenylcarbodi-imide (4) gave benzimidazo[1,2-f]phenanthridine (8), and the nitronaphthylcarbodi-imide (11) gave benz[cd]indazole N-oxide (12), in new rearrangements involving the nitro groups.
D. F. Pipe and C. W. Rees, J. Chem. Soc., Chem. Commun., 1982, 520 DOI: 10.1039/C39820000520
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