C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/472.45
C07C 69/73 (2006.01) C07C 67/08 (2006.01) C07C 69/88 (2006.01)
Patent
CA 1225405
Abstract of the Disclosure: Carboxylic acids containing phenol groups are esteri- fied by means of (C1-C3)-alcohols in the presence of acid catalysts without the phenolic hydroxyl groups be- ing esterified at the same time by continuously metering an excess of a water-containing (C1-C3)-alcohol into a boiling hot solution or suspension of the phenol-con- taining carboxylic acid and of the catalyst in a non- water-miscible solvent (for example xylene) and at the same time distilling off a ternary solvent/alcohol/water mixture via a water separator, the metering rate being such that an aqueous bottom phase separates out in the receiving flask and the water content of the alcohol be- ing so apportioned as not to breach the bottom limit of 0.1% or the upper limit of 1% (based on the contents of the reaction vessel) at any time in the course of the reaction. In this process, the esterification products are obtained free of major impurities and frequently can be used further without further purification.
464728
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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