Diphenyl sulphide-2-carboxylic acids rearrange to aryl esters of diphenyl disulphide-2,2′-dicarboxylic acids, biphenyl-2-carboxamides cyclise to phenanthridones, and 2-acylaminobiphenyls to carbazoles, on oxidation with persulphate.
P. M. Brown, P. S. Dewar, A. R. Forrester, A. S. Ingram and R. H. Thomson, J. Chem. Soc. D, 1970, 849 DOI: 10.1039/C29700000849
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