Knoevenagel condensation in aqueous media promoted by 2,2′-bipyridinium dihydrogen phosphate as a green efficient catalyst
作者:Shila Darvishzad、Nader Daneshvar、Farhad Shirini、Hassan Tajik
DOI:10.1007/s11164-021-04445-3
日期:2021.7
ionic compound named 2,2′-bipyridinium dihydrogen phosphate was synthesized by addition of phosphoric acid to a solution of 2,2′-Bipyridine in dichloromethane. After the characterization using FT-IR, mass, 1H, 13C and 31P NMR techniques, it was used as a Bronsted dicationic acidic catalyst for the promotion of the synthesis of 2-arylidene malononitrile and 5-arylidene barbituric acid derivatives via
通过将磷酸添加到2,2'-联吡啶在二氯甲烷中的溶液中,合成了名为2,2'-联吡啶二磷酸二氢的基于2,2'-联吡啶的离子化合物。在使用FT-IR,质谱,1 H,13 C和31 P NMR技术进行表征后,将其用作布朗斯台克双阳离子酸性催化剂,以促进通过Knoevenagel合成2芳基丙二腈和5芳基巴比妥酸衍生物。在水中发生缩合反应。该方法的一些优点是在高反应速率和产率下利用容易制备的,成本有效的和生态友好的有机盐作为催化剂,简单和快速的后处理以及可接受的催化剂可重复使用性。