Dimethyl Sulfate → 1-ETHYL-3-METHYLIMIDAZOLIUM 2-(2-METHOXYETHOXY)ETHYL SULFATE

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Reaction Steps

In a 100 ml Schlenk flask, 16.27 g (0.129 moles) of dimethyl sulfate was slowly added dropwise to 12.40 g (0.129 moles) of ethylimidazole with ice cooling and under a blanket gas. Stirring of the mixture was continued at room temperature over night. After the addition of 30.92 g (0.258 moles; 2 equ.) of diethylene glycol monomethyl ether, the volatile fractions were removed in a distillation apparatus at 160° C. for 5 hours. After drying the mixture in a high vacuum, 1-methyl-3-ethylimidazolium 2-(2-methoxyethoxy)ethyl sulfate was obtained as a low-viscous, slightly yellow liquid in quantitative yield.

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