Versatile synthesis of 1, 2, 3-triazolium-based ionic liquids

Abstract

1, 2, 3-Triazolium-based ionic liquids are prepared in a straightforward two-step procedure. In the first step azides and alkynes are transformed into 1, 4-disubstituted 1,2,3-triazoles by Cu-mediated click-reaction. Subsequent alkylation affords 1,3,4-trisubstituted 1,2,3-triazolium salts as ionic liquids, which can be further modified by exchanging the anion by salt metathesis. The synthesis provides access to simple ionic liquids as well as to functionalized ionic liquids, bearing organocatalytic, fluorescent or linking groups thus representing task specific ionic liquids or IL-tagged organocatalysts, respectively.