Comparative study of chemically immobilized and conventional homogeneous ionic liquids as phase-transfer catalysts for the N-alkylation of heterocyclic compounds
作者:Shallu Dogra、Madan L. Sharma、Jasvinder Singh
DOI:10.1016/j.crci.2015.02.004
日期:2015.9
Résumé Various ionic liquids (ILs) were screened for their phase-transfer catalytic (PTC) activity using the N-alkylation of nitrogen heterocycles as the model reaction. Immobilized ILs behaved extremely well and proved to be far better catalysts than conventional homogeneous PTCs in terms of their stability, easy recovery, and reusability. The investigation also demonstrated that quaternary tetraalkylammonium salts offer very high catalytic activity, whereas aromatic heterocyclic tetravalent nitrogen catalysts (imidazolium- and pyridinium-based salts) were poorly active. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.doc
摘要
在高氮杂环的N-烷基化模型反应中,筛选了多种离子液体(ILs)以评估其相转移催化(PTC)活性。固定化离子液体表现极为出色,在稳定性、易回收性和重复使用性方面证实了它们远优于传统的均相PTC催化剂。研究还表明,季铵盐具有非常高的催化活性,而芳香杂环四价氮催化剂(咪唑盐和吡啶盐)则活性较低。
补充材料:
本文的补充材料以单独文件的形式提供:mmc1.doc