Selective synthesis of carbamates from amines and dimethyl carbonate were studied in the presence of various ionic liquids as catalysts. The –SO3H-functionalized ionic liquid was found to be the most active catalyst among the applied ionic liquids, and nearly 100% conversion and 95% selectivity were achieved when using 1,6-hexanediamine as reactant. The acid functional ionic liquid catalyst system is also readily separable and reusable after reaction.

Keywords: Green chemistry; Ionic liquid; Carbamates; Amine; Non-phosgene

★★★☆☆ Zhou HC,Shi F,Tian X,et al. Synthesis Of Carbamates From Aliphatic Amines And Dimethyl Carbonate Catalyzed By Acid Functional Ionic Liquids[J]. Journal Of Molecular Catalysis A: Chemical,2007,271:89-92.