A new process for the preparation of alkalimetal salts of 3,5-substituted 4-hydroxybenzoic acids and the free acids thereof, which comprises reacting a 2,6-disubstituted phenol in a mixture of water and a dipolar aprotic solvent with an alkalimetal hydroxide, removing the water, treating the reaction mixture with carbon dioxide and in case of preparing the free acids treating the reaction mixture with a mineral acid. The alkalimetal salts of 4-hydroxybenzoic acids and the free acids thereof are compounds which can be used as intermediates for stabilizers.
一种制备3,5-取代
4-羟基
苯甲酸碱
金属盐和其自由酸的新工艺,包括在
水和双极性无
水溶剂混合物中,将2,6-二取代
苯酚与碱
金属氢氧化物反应,去除
水,用
二氧化碳处理反应混合物,如果制备自由酸,则用矿酸处理反应混合物。
4-羟基
苯甲酸碱
金属盐和其自由酸是可用作稳定剂中间体的化合物。