Nitrile oxides react with 2-phenylbenzazete to give labile initial cycloadducts (3) which rearrange very readily to give 1,3,5-oxadiazepines (7) presumably via an oxaziridine (5), thus providing independent support for the widely assumed intermediacy of oxaziridines in photochemical rearrangements of heterocyclic N-oxides.
C. W. Rees, R. Somanathan, R. C. Storr and A. D. Woolhouse, J. Chem. Soc., Chem. Commun., 1975, 740 DOI: 10.1039/C39750000740
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