Oxidation of 1-amino-3,4,5,6-tetraphenylpyrid-2(1H)-one (I) results in loss of carbon monoxide, rather than nitrogen, to give tetraphenylpyridazine (II); this new rearrangement is thought to involve ring expansion of the amino-nitrene, valence isomerization, and extrusion of carbon monoxide.
C. W. Rees and M. Yelland, J. Chem. Soc. D, 1969, 377a DOI: 10.1039/C2969000377A
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