壳聚糖固载碱性离子液体催化Knoevenagel缩合反应  

Knoevenagel Condensation Catalyzed by a Basic Ionic Liquid Catalyst Immobilized on Chitosan

作　　者：管琪雯 张卫红[1] 陆明珠 邹凯 刘平[1] GUAN Qiwen;ZHANG Weihong;LU Mingzhu;ZOU Kai;LIU Ping(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《化学反应工程与工艺》2023年第3期283-288,共6页Chemical Reaction Engineering and Technology

基　　金：江苏省绿色催化材料与技术实验室开放课题(BM2012110)。

摘　　要：通过壳聚糖与1-乙烯基-3-丁基氯化咪唑([VBIm]Cl)的自由基加成反应以及随后与KOH溶液的阴离子交换反应,制备了壳聚糖固载碱性离子液体催化剂(CS-NH-[EBIm]OH)。考察了该催化剂在苯甲醛与丙二腈的Knoevenagel缩合反应中的催化性能。结果表明:CS-NH-[EBIm]OH是催化Knoevenagel反应的高效多相催化剂,所得缩合产物(苯亚甲基丙二腈)的收率和选择性分别高达99.1%和100%。每次使用后的催化剂经简单处理后可以再循环使用4次而产物产率无明显下降。此外还发现CS-NH-[EBIm]OH对各种醛和丙二腈的Knoevenagel缩合反应表现出较高的催化活性。A basic ionic liquid-immobilized chitosan catalyst(CS-NH-[EBIm]OH)was prepared by the radical addition reaction of chitosan with 1-vinyl-3-butylimidazolium chloride([VBIm]Cl),and a subsequent anion-exchange reaction with KOH solution.The catalytic performance of the obtained catalyst was investigated in Knoevenagel condensation of benzaldehyde and malononitrile.The results showed that CS-NH-[EBIm]OH was an effective heterogeneous catalyst and the yield and selectivity of the obtained condensation product(benzylidene malononitrile)were as high as 99.1%and 100%respectively.The catalyst after each used could be reused 5 times after simple treatment without a significant decrease in product yield.Moreover,it was found by changing the reaction substrate aldehyde that CS-NH-[EBIm]OH exhibited high catalytic activity for Knoevenagel condensations of a wide range of aldehydes and malononitrile.

关 键 词：离子液体 壳聚糖 KNOEVENAGEL缩合反应 

分 类 号：TQ032.4[化学工程]