V. G. Sayapin, A. Simonov, V. V. Kuz’menko
May 1, 1970
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Journal
Chemistry of Heterocyclic Compounds
Abstract
The reaction of benzimidazole and its 2-substituted derivatives with chlorosulfonic acid is examined. It is shown that only compounds containing electrophilic substituents in the 2-position yield sulfonic chlorides. Benzimidazole and its 2-methyl derivative give the sulfonic acids. Substitution occurs at the 5-position of the benzimidazole nucleus.