2-Arylbenzazetes are produced by photolysis of 4-arylbenzotriazines (1) and can be intercepted in cyclo-addition reactions; the benzazetes dimerise thermally to give the angular dimers (2) and, in the presence of Lewis acids, the linear dimers (5).
C. W. Rees, R. C. Storr and P. J. Whittle, J. Chem. Soc., Chem. Commun., 1976, 411 DOI: 10.1039/C39760000411
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