3-Methyl-1,5-diphenylpyrazole-4- and 3-methyl-1-(p-nitrophenyl)-5-phenylpyrazole-4-sulphonyl chlorides give polychlorophenylazobutanone derivatives upon treatment with chlorine in aqueous acetic acid. This cleavage of the pyrazole ring is preceded by elimination of the sulphonyl group as sulphate ion.
R. J. Alabaster and W. J. Barry, J. Chem. Soc., Perkin Trans. 1, 1976, 428 DOI: 10.1039/P19760000428
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