硫酸铁催化合成4,4′-二苯醚二甲酸二甲酯

Synthesis of dimethyl-4,4′-oxybisbenzoate with ferric sulfate as catalyst

采用硫酸铁催化酯化反应制备了一种重要的高分子单体 4 ,4′-二苯醚二甲酸二甲酯。最佳反应条件为 :n(甲醇 )∶ n(4,4′-二苯醚二甲酸 ) =4 0∶ 1,反应温度 16 0℃ ,反应时间 1h,催化剂用量为 4 ,4′-二苯醚二甲酸质量的 3%。在此条件下 ,酯收率大于 95 %

An important polymer monomer dimethyl 4,4′ oxybisbenzoate (DMOBB) was prepared with ferric sulfate as catalyst.The optimum esterification conditions were determined as follows:The molar ratio of methanol to 4,4′ oxybisbenzonic acid (OBBA) is 40∶1;the reaction temperature is 160℃;the reaction time is 1h and the amount of catalyst is 3% of OBBA mass.Under these conditions the yield of DMOBB is higher than 95%.