| 摘要 |
PURPOSE:To obtain in high yield 1,3-dimethyl-2-imidazolidinone useful as an improved solvent for high polymer compounds, by reacting N,N'-dimethyl ethylenediamine with urea by the use of a polar solvent at a specific tempera ture. CONSTITUTION:N,N'-Dimethylethylenediamine is reacted with urea in a polar solvent such as N,N-dimethylformamide, N,N-dimethylacetamide, tetramethyl urea, etc. (especially preferably 1,3-dimethyl-2-imidazolidinone, reaction product) at >=180 deg.C, especially 200-260 deg.C, to give 1,3-dimethyl-2-imidazolidionone. Espe cially in the case that the reaction product is used as a solvent, separation of the reaction product from the solvent is not required during distillation, so the process is extremely simplified.
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