Oxidations of some N-methylbiphenyl-2-carboxamides by aqueous potassium persulphate give γ-lactam derivatives as well as the expected phenanthridones, especially in alkaline solution.
D. H. Hey, G. H. Jones and M. J. Perkins, J. Chem. Soc. D, 1971, 998b DOI: 10.1039/C2971000998B
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