催化合成(Z)-丁烯二酸二[2-(2-乙基)己氧基]乙酯的条件优化

The optimized conditions in catalytic synthesis of bis[2-(2-ethylhexyloxy) ethyl] (Z)-butenedioic ester

以对甲苯磺酸为催化剂合成中间体 (Z) -丁烯二酸二 [2 -(2 -乙基 )己氧基 ]乙酯 ,考察并优化了酯化反应条件 ,完善了新型阴离子表面活性剂丁二酸二 [2 -(2 -乙基 )己氧基 ]乙酯磺酸钠的合成条件 .确定了酯化反应最佳条件为 :醇酐摩尔比为 4∶1 ,催化剂用量约占反应物总质量的 0 8% ,以 1 2 0mL苯为带水剂 ,在回流状态下反应 6h .最终酯化率可达 95 8% .

The intermediate, bis[2-(2-ethylhexyloxy)ethyl] ( Z )-butenedioic ester, was synthesized using p-toluene sulphonic acid as catalyst. The reaction conditions of esterification were investigated and optimized. The synthetic conditions of a new anioic surfactact sodium bis[2-(2-ethylhexyloxy)ethyl] suifosuccinate were perfected. The optimum conditions of esterification are as follows: the ratio of alcohol to anhydride is 4∶1, the amount of the catalyst is 0.8 percent of the total weight of the reaction masses, benzene (120 mL) is the agent to take water out, the reaction is carried on about 6 hours in reflux state, and the final ester rate can come up to 95.8%.