C[O:2][C:3](=[O:5])[O-:4].[CH3:6][N+:7]([CH3:16])([CH3:15])[CH2:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1>O>[C:3](=[O:2])([O-:5])[OH:4].[CH3:6][N+:7]([CH3:16])([CH3:15])[CH2:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1112.5 g of trimethylbenzylammonium monomethylcarbonate and 55.0 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. Trimethylbenzylammonium hydrogencarbonate was obtained in a yield of 95.7 mol %.
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