Pd(OAc)2-catalyzed cross-coupling of polyfluoroarenes with simple aromatics in imidazolium ionic liquids (ILs) without oxidant and additive and with recycling/reuse of the IL
作者:Rajesh G. Kalkhambkar、Kenneth K. Laali
DOI:10.1016/j.tetlet.2011.08.077
日期:2011.10
for an oxidant and an additive. The reaction is catalyzed by HOAc and it is subject to a primary isotope effect (KH/KD = 4.87). Competitive cross-coupling reactions of 1,2,4,5-tetrafluorobenzene with benzene/toluene, benzene/anisole, and anisole/toluene gave KB/KT = 5.1, KB/KA = 5.7, and KA/KT = 5.0, respectively, indicative of a remote substituent effect on Pd insertion into the phenyl C–H bond. Mild
通过使用溶解在咪唑类ILs [(bmim)PF 6和(bmim)BF 4 ]中的Pd(OAc)2,可以使聚氟芳烃与简单的芳族化合物(苯,甲苯和苯甲醚)交叉偶联,分离效果好。不需要氧化剂和添加剂。该反应被HOAc催化,并受到主要的同位素作用(K H / K D = 4.87)。1,2,4,5-四氟苯与苯/甲苯,苯/苯甲醚和苯甲醚/甲苯的竞争性交叉偶联反应得出K B / K T = 5.1,K B / K A = 5.7和KA / K T = 5.0,分别表明对Pd插入苯基C–H键的远程取代基作用。温和的反应条件,简单的产物分离以及IL的回收/再利用是该方法的其他优势。