New route to carbonate-functionalized imidazolium and pyrrolidinium-based ionic liquids
Résumé
A new, versatile, and green route to access ionic liquids containing carbonate groups, including 1-[2-(propyloxycarbonyloxy)ethyl]-3-methyl imidazolium and N-methyl-N-[2-(propyl-oxcarbonyl) ethyl] pyrrolidinium associated with a bis(trifluoromethane)sulfonimide anion, [C1(C2O(CO)OC3)Im][NTf2] (4) and [C1(C2O(CO)OC3)Py][NTf2] (5), has been developed and characterized. The key point of this route is to avoid the metathesis reaction step with LiNTf2, which could result in ionic liquids that are highly contaminated with LiCl salt through the coordination of lithium ions by the carbonate group.