SO_3H-功能化离子液体的合成及用于催化酯化反应的研究

SO_3H-functionalized ionic liquids and their uses as dual solvent—catalysts for esterifications

采用两步法制备了一种基于4-二甲氨基吡啶(DMAP)的SO3H-功能化Br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。

A SO3 H-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-butanedio] 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. I% ,and selectivity approximately 100%at 40 ℃ for5 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.