H. Cerfontain, Y. Zou, B. Bakker
Jul 1, 1994
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Journal
Phosphorus Sulfur and Silicon and The Related Elements
Abstract
Abstract The sulfonation of biphenyl (1) and its 2- and 4-methoxy, 3, 3′- and 4, 4′-dimethoxy, and 4, 4′-dimesyloxy derivatives with sulfur trioxide in dichloromethane as solvent at 22°C has been studied. Sulfonation of biphenyl leads to the subsequent formation of the 4-sulfonic acid (4-S), 4, 4′-S2, 2,4, 4′-S3 and traces of 2,4,2′, 4′-S4. The sulfonation of the oxy substituted biphenyls also occurs successively in the one phenyl and then in the other. In case of the asymmetrical 2- and 4-methoxybiphenyl the substitution starts in the anisyl moiety.