Metal- and Solvent-Free Transesterification and Aldol Condensation Reactions by a Homogenous Recyclable Basic Ionic Liquid Based on the 1,3,5-Triazine Framework,ChemistryOpen

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Metal- and Solvent-Free Transesterification and Aldol Condensation Reactions by a Homogenous Recyclable Basic Ionic Liquid Based on the 1,3,5-Triazine Framework
ChemistryOpen ( IF 2.5 ) Pub Date : 2021-08-05 , DOI: 10.1002/open.202100091
Yanqiu Hu ₁ , Mingqi Ren ₁ , Milad Kazemnejadi ₂

Affiliation

A new recyclable basic ionic liquid was introduced as an efficient catalyst for aldol condensation and transesterification reactions under environmentally friendly conditions. The catalyst was prepared based on methyl imidazolium moieties bearing hydroxide counter anions via the Hofmann elimination on a 1,3,5-triazine framework. The ionic liquid with two functionalities including anion stabilizer and high basicity, was used as an efficient catalyst for aldol condensation as well as transesterification reaction of a variety of alkyl benzoates. All reactions were performed in the absence of any external reagent, co-catalyst, or solvent, in line with environmental protection. The kinetics isotope effect (KIE) was conducted for the transesterification reaction to elucidate the mechanism and rate determining step (RDS). It worth noted that, the homogeneous catalyst could be recycled from the reaction mixture and reused for several consecutive runs with insignificant drop of basicity and conversion.

中文翻译：

基于 1,3,5-三嗪骨架的均质可回收碱性离子液体的无金属和无溶剂酯交换和羟醛缩合反应

引入了一种新型可回收碱性离子液体，作为环保条件下羟醛缩合和酯交换反应的有效催化剂。该催化剂基于带有氢氧根抗衡阴离子的甲基咪唑鎓部分，通过1,3,5-三嗪骨架上的霍夫曼消除反应制备。该离子液体具有阴离子稳定剂和高碱度两种功能，可用作羟醛缩合以及多种苯甲酸烷基酯酯交换反应的有效催化剂。所有反应均在没有任何外部试剂、助催化剂或溶剂的情况下进行，符合环境保护。对酯交换反应进行动力学同位素效应（KIE），以阐明其机理和速率决定步骤（RDS）。值得注意的是，均相催化剂可以从反应混合物中回收，并在多次连续运行中重复使用，碱度和转化率下降不显着。

更新日期：2021-08-05

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