Abstract

Dehydrothio-<i>p</i>-toluidine sulfonic acid (DTSA) is commonly used as a dye intermediate. It is typically produced by sulfonation of the product obtained from fusion of <i>p</i>-toluidine and sulfur. In addition to the major component, 2-(4-aminophenyl)-6-methyl-7-benzothiazolyl-sulfonic acid (APM-7-BSA), a commercial sample of DTSA, characterized for the National Toxicology Program, was found to contain sulfonic acid isomers of the major component which have not been described in the chemical literature.

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