2-imidazolidone synthesis method
A technology of imidazolidinone and synthesis method, applied in the field of synthesis of 2-imidazolidinone, can solve the problems of high raw material price, high price of ethylene carbonate, use price, etc., and achieves simple and easy operation of reaction process and green synthesis method. The effect of cleanliness and less discharge of three wastes
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Embodiment 1
[0025] Into a heatable reactor (with stirring device), add 1.0g sulfamic acid (0.01mol), 6mL methanol, 3.0g ethylenediamine (0.05mol), 5.4g dimethyl carbonate (0.06mol), 60 °C for 3 hours, then the temperature was raised to 160 °C, and the reaction was stopped after 15 hours of reaction. The reaction solution was naturally cooled to room temperature, filtered to remove the catalyst, and then the solvent was removed to obtain the crude product 2-imidazolidinone. Quantitative analysis was carried out by gas chromatography, and the yield was 62.1%.
[0026] NMR analysis results:
[0027] 1 H NMR (400MHz,D 2 O): δ3.47(s,4H). 13 C NMR (100MHz,D 2 O): δ40.69 (2C), 167.07 (1C).
Embodiment 2
[0029] Into a heatable reactor (with stirring device), add 1.0g sulfamic acid (0.01mol), 6mL methanol, 3.0g ethylenediamine (0.05mol), 6.3g dimethyl carbonate (0.07mol), 60 °C for 3 hours, then the temperature was raised to 160 °C, and the reaction was stopped after 15 hours of reaction. The reaction solution was naturally cooled to room temperature, filtered to remove the catalyst, and then the solvent was removed to obtain the crude product 2-imidazolidinone. Quantitative analysis was carried out by gas chromatography, and the yield was 63.4%.
Embodiment 3
[0031] Into a heatable reactor (with stirring device), add 1.0g sulfamic acid (0.01mol), 6mL methanol, 3.0g ethylenediamine (0.05mol), 7.2g dimethyl carbonate (0.08mol), 60 °C for 3 hours, then the temperature was raised to 160 °C, and the reaction was stopped after 15 hours of reaction. The reaction solution was naturally cooled to room temperature, filtered to remove the catalyst, and then the solvent was removed to obtain the crude product 2-imidazolidinone. Quantitative analysis was carried out by gas chromatography, and the yield was 63.0%.
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