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The large scale synthesis of pure imidazolium and pyrrolidinium ionic liquids
Anthony K. Burrell ,  Rico E. Del Sesto ,  Sheila N. Baker ,  T. Mark McCleskey and Gary A. Baker
Green Chem., 2007,9, 449-454

http://pubs.rsc.org/en/Content/ArticleLanding/2007/GC/b615950h

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