Process for the preparation of a therapeutically active substituted phenoxyacetic acid and a novel acid anhydride for use therein.

摘要

Tienilic acid, [2,3-dichloro-4-(2-thienyl-carbonyl)-phenoxy] acetic acid, is advantageously made by reacting 2,3-dichloro-4-(2-thienylcarbonyl)-phenol with chloroacetic acid anhydride and hydrolysing the novel anhydride, viz. [2,3-dichloro- 4-(2-thienylcarbonyl)- phenoxy]acetic acid anhydride, so produced.