The non-aromatic benzocarbazoles (4) and (10) are isolable stable compounds; (4) are produced by photolysis of the benzotriazoles (3), and on further irradiation undergo aza-di-π-methane arrangement to give the indenoquinolines (5), whilst as expected (10) is photostable.
J. J. Kulagowski, G. Mitchell, C. J. Moody and C. W. Rees, J. Chem. Soc., Chem. Commun., 1985, 650 DOI: 10.1039/C39850000650
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