Simple,efficient and recyclable palladium catalytic system for Heck reaction in functionalized ionic liquid network

摘要

In functionalized ionic liquid network of [BMIM][TPPMS] and [BMIM][OAc],PdCl_2(CH_3CN)_2 efficiently catalyzed the Heck reaction of bromobenzene to ethyl cinnamate with yield of 60% and without the activity loss even after 11 recycling uses.The beneficial influences of this ionic liquid network on activity and stability were explained in terms of synergic ligand effects of [BMIM][TPPMS] and [BMIM][OAc],no accumulation of sodium or ammonium bromides by using [BMIM][OAc] as base,and the positive effect of [BMIM]Br by avoiding the formation of palladium black.The generality of this ionic liquid system to the different substrates also gave the pleasing results.