A Study on Synthesis of Some Functionalized Ionic Liquids with Long Chain of Carbone Starting from Imidazole

The purpose of this investigation was the synthesis of functionalized ionic liquids with long chain of carbon in order to increase their lipophilicity starting from imidazole. Synthesis of some ionic liquids ILs 3 a-b is described starting from imidazole 1. The starting material is converted under microwave irradiation to N-alkyl imidazole (1a-b) which reacted with allylbromide to give functionalized N-alkyl, N’-allyl imidazolium bromide (2a-b). Hydroboration followed by methanolysis and acid hydrolysis applied to these give the target compounds 3 a-b in good yields. In comparison to the conventional method, we synthesised some functionalized acid ionic liquids starting from imidazole with high yield using microwave irradiation, avoiding the long reaction time and the risk of product degradation.