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    • 4. 发明公开
    • CHLOROPYRIMIDINE PROCESS
    • 氯化嘧啶工艺
    • EP1042303A1
    • 2000-10-11
    • EP98964168.3
    • 1998-12-18
    • Dow AgroSciences LLC
    • LENG, Ronald, BruceRINGER, James, WilliamMAURER, Julie, Lynn
    • C07D239/34C07D239/30
    • C07D239/30C07D239/34Y02P20/582
    • Chloropyrimidine compounds, such as 4,6-dichloro-2-ethoxypyrimidine, were prepared in good yield and good purity from the corresponding hydroxypyrimidine compounds in the absence of organic solvents and with a reduced amount of phosphorus oxychloride by carrying out the reaction in the presence of a trialkylamine compound and phosphorus trichloride. The additions of hydroxypyrimidine compound and trialkylamine compound could be made in segments. The chloropyrimidine compounds produced were recovered in an improved manner by adding chlorine to convert the chlorophosphoric acid by-products and phosphorus trichloride to phosphorus oxychloride, diluting the mixture with additional chloropyrimidine compound and removing the phosphorus oxychloride by distillation, combining the residue with water and a base, distilling the trialkylamine compound from the resulting mixture, and removing the aqueous phase.
    • 在不存在有机溶剂的条件下,通过在相应的羟基嘧啶化合物存在下以良好的产率和高纯度制备氯嘧啶化合物,例如4,6-二氯-2-乙氧基嘧啶,其中通过在存在的情况下进行反应来减少量的三氯氧化磷 的三烷基胺化合物和三氯化磷。 可以分段加入羟基嘧啶化合物和三烷基胺化合物。 通过加入氯将氯代磷酸副产物和三氯化磷转化成三氯氧化磷,用另外的氯嘧啶化合物稀释混合物并通过蒸馏除去三氯氧化磷,将残余物与水和甲醇混合,以改进的方式回收所产生的氯嘧啶化合物 从所得混合物中蒸馏出三烷基胺化合物,并除去水相。