SO3 H-功能化离子液体的合成及用于催化酯化反应的研究

摘要

A SO3H-functionalized ionic liquid catalyst,based on 4-dimethyl aminopyridine(DMAP),is synthesized by a two-step proceeding and its use as dual solvent-catalyst for esterification reaction of 1,4-butanediol with acetic acid is investigated.Reaction of DMAP with 1,3-propane sultone produces a monosubstituted zwitterionic compound ,whose tertiary amine nitrogen atom bearing the appended sulfonic acid group ,in high yields.The functional ionic liquid has good catalytic activity ,with the product yield reac-hing 88.1%,and selectivity approximately 100%at 40℃for 5 h.The synthesized esters could be separated by decantation ,and the ionic liquid could be reused after the removal of water.This stable ,eco-friendly ionic liquid may be an ideal catalyst for esterifica-tion of polyhydric alcohols.%　　采用两步法制备了一种基于4-二甲氨基吡啶（ DMAP）的SO3 H-功能化Br碬nsted酸性离子液体，并将其应用于催化1，4-丁二醇与乙酸的酯化反应。 DMAP与1，3-丙烷磺酸内酯（PS）反应生成单一的两性离子化合物，收率接近100％。该离子液体对1，4-丁二醇与乙酸的酯化反应催化活性较高，在温度为40℃时酯化率可达88.1％，选择性为100％，催化剂易与产物分离，且可以循环使用。