Formation of 9,10-diphenylanthracene and the benzazetine (5) from 2-phenylbenzazete (1) and diphenylketen involves a stepwise 2 + 4 cycloaddition in which the keten acts formally as a diene; the benzazetine (5) gives diphenylanthracene at high temperature.
C. W. Rees, R. Somanathan, R. C. Storr and A. D. Woolhouse, J. Chem. Soc., Chem. Commun., 1976, 125 DOI: 10.1039/C39760000125
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