Two novel binuclear sulfonic-functionalized ionic liquids: Influence of anion and carbon-spacer on catalytic efficiency for one-pot synthesis of bis(indolyl)methanes
作者:Nader Ghaffari Khaligh、Taraneh Mihankhah、Mohd Rafie Johan、Juan Joon Ching
DOI:10.1016/j.molliq.2018.03.044
日期:2018.6
from pyrazinium, piperazinium, benzimidazolium, imidazolium mono- or di-cation containing chloride and hydrogen sulfate as counter anion under optimized conditions. It was proved that the new ionic liquids containing two sulfonic imidazole moieties with four-carbon spacer as well as hydrogen sulfate as acidic counter anion were superior to the previously reported ionic liquids.
合成了两种新的具有四碳间隔基的双核磺酸官能化离子液体,并通过FTIR,MS,1 H和13对其结构进行了表征1 H NMR; 然后确定特定任务的新型离子液体水溶液的一些物理性质和pH值。研究了它们在温和条件下的双溶剂催化活性,以合成双(吲哚基)甲烷。在优化的条件下,将这些离子液体的催化活性与衍生自吡嗪鎓,哌嗪鎓,苯并咪唑鎓,咪唑鎓单或二阳离子的氯化物和硫酸氢盐作为抗衡阴离子的某些离子液体进行了比较。事实证明,含有两个带有四个碳间隔基的磺酸咪唑部分以及硫酸氢盐作为酸性抗衡阴离子的新型离子液体优于以前报道的离子液体。