反应详情

Analogously to Example 1, 23.0 g (0.132 mol) of 1-butyl-3-methylimidazolium chloride are reacted with 28.0 g of approx. 80% aqueous trifluoroacetic acid, CF3C(O)OH (50% excess). 100 ml of 1,4-dioxane are subsequently added, and 112 ml of HCl- and CF3C(O)OH-containing water/dioxane azeotrope are distilled off at atmospheric pressure (85-101° C.). After four further azeotropic distillations with 100 ml of 1,4-dioxane each time, a further 19 g of approx. 80% aqueous trifluoroacetic acid are added to the residue. 100 ml of 1,4-dioxane are subsequently added, and 105 ml of HCl- and CF3C(O)OH-containing water/dioxane azeotrope are distilled off at atmospheric pressure. After three further azeotropic distillations with 100 ml of 1,4-dioxane each time and drying of the distillation residue under reduced pressure at 1.3 Pa and 70° C., 1-butyl-3-methylimidazolium trifluoroacetate is obtained. The yield is approximately quantitative.

1. distillationazeotrope are distilled off at atmospheric pressure (85-101° C.)
2. additionAfter four further azeotropic distillations with 100 ml of 1,4-dioxane each time, a further 19 g of approx. 80% aqueous trifluoroacetic acid are added to the residue
3. addition100 ml of 1,4-dioxane are subsequently added
4. addition105 ml of HCl- and CF3C(O)OH-containing water/dioxane
5. distillationazeotrope are distilled off at atmospheric pressure
6. dry with materialAfter three further azeotropic distillations with 100 ml of 1,4-dioxane each time and drying of the distillation residue under reduced pressure at 1.3 Pa and 70° C.