Benzil reacts with chlorosulphonic acid to give 3-chloro-2-phenylbenzofuran-6,4′-disulphonyl dichloride. The product was characterised as the corresponding bis-dimethylsulphonamide (1), and a mechanism has been proposed for the chlorosulphonation reaction. The chlorosulphonation of 2,3-diphenylpyrazine and 3,4-diphenylfurazan is also reported.
R. J. Cremlyn, O. O. Shode and F. J. Swinbourne, J. Chem. Soc., Perkin Trans. 1, 1983, 2181 DOI: 10.1039/P19830002181
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