The aryl radical formed by reductive cleavage of the carbon–chlorine bond in 2-chloro-NN-diphenylbenzamide undergoes exclusive capture by the neighbouring N-phenyl group to yield N-phenylphenanthridone and biphenyl-2-carboxanilide. 2-Chloro-NN-di-4-tolylbenzamide undergoes a similar reaction.
J. Grimshaw and D. Mannus, J. Chem. Soc., Perkin Trans. 1, 1977, 2456 DOI: 10.1039/P19770002456
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