Efficient Dichloromethylation of Some Aromatic Hydrocarbons Catalyzed by a New Ionic Liquid [C12minPEG800]Br under Homogeneous Catalysis in Aqueous Media
Y.L. Hu, X. Liu, T.T. Lu, M. Lu*, Q. Ge and S.B. Zhang
Chemical Engineering College, Nanjing University of Science and Technology, Nanjing 210094, PR China
A series of new imidazolium-type ionic liquids based on polyethylene glycol have been prepared. The new recyclable temperature-dependant phase-separation system comprised of [C12minPEG800]Br and methylcyclohexane was also developed and successfully applied to the dichloromethylation of some aromatic hydrocarbons to prepare dichloromethyl-substituted hydrocarbons in excellent yields. The ionic liquid could be excellent recycled without any apparent loss of catalytic activity and little loss of weight even after 8 times recycling.
Keywords: Aromatic hydrocarbons, Dichloromethylation, [C12minPEGn]Br, Temperature-dependent ionic liquid biphasic system