| 摘要 |
PURPOSE:To enable a reaction of an N,N'-dialkylethylenediamine with phosgene in homogeneous state, to facilitate the pH control of the reaction and to obtain the titled compound useful as a polar aprotic solvent in high yield, by carrying out the reaction essentially in the presence of water and a dehydrochlorination agent. CONSTITUTION:The compound of formula II can be produced by reacting an N,N'-dialkylethylenediamine of formula I (R is -C2H5, -C3H7 or -C4H9) with phosgene essentially in the presence of water and a dehydrochlorination agent preferably at 0-70 deg.C. The dehydrochlorination agent is e.g. trimethylamine, pyridine, sodium hydroxide, etc. The pH of the reaction system is adjusted to 3.0-10.0, preferably 4.0-9.0 with the dehydrochlorination agent. The amount of phosgene and dehydrochlorination agent is 1.1-1.5 times the stoichiometric amount of the diamine used as the starting compound. It is essential to perform the reaction in the presence of water and the amount of water is preferably 5-30pts.wt. per 1pt.wt. of the diamine.
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