C[O:2][C:3](=[O:5])[O-:4].[CH3:6][N+:7]([CH3:11])([CH3:10])[CH2:8][CH3:9]>O>[C:3](=[O:2])([O-:5])[OH:4].[CH3:6][N+:7]([CH3:11])([CH3:10])[CH2:8][CH3:9]114.1 g of trimethylethylammonium monomethylcarbonate and 75.6 g of water were introduced in the same reactor as used in Preparation Example 1 and heated with stirring. After the temperature in the reactor reached 120° C., the reaction was continued for 3 hours at 120° C. Trimethylethylammonium hydrogencarbonate was obtained in a yield of 96.3 mol %.
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