Diphenylamine was cyclised to carbazole in moderate yield in refluxing chloroform with peroxide in the presence of light (200 W tungsten lamp); 3-methylcarbazole was synthesised similarly.
P. Bhattacharyya, S. S. Jash and A. K. Dey, J. Chem. Soc., Chem. Commun., 1984, 1668 DOI: 10.1039/C39840001668
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