Process for preparing methyl ester of O,O-dimethyl-dithiophosphoryl
acetic acid
    1.
    发明授权
    Process for preparing methyl ester of O,O-dimethyl-dithiophosphoryl acetic acid 失效
    制备O,O-二甲基 - 二硫代磷酰基乙酸甲酯的方法

    公开(公告)号:US3997630A

    公开(公告)日:1976-12-14

    申请号:US560201

    申请日:1975-03-20

    IPC分类号: C07F9/165

    CPC分类号: C07F9/1651

    摘要: The methyl ester of O,O-dimethyl-dithiophosphoryl acetic acid is prepared with minimal formation of by-products by reacting the sodium salt of O,O-dimethyl-dithiophosphoryl acid with the methyl ester of 2-chloroacetic acid at a pH of 5.5 to 7, at relatively high temperatures, of the order of 80.degree. to 100.degree. C, for reaction times of 10 to 15 minutes. The process can be carried out continuously.

    摘要翻译: 通过使O,O-二甲基 - 二硫代磷酰基酸的钠盐与2-氯乙酸的甲酯在pH5.5下反应,使O,O-二甲基 - 二硫代磷酰基乙酸的甲酯最小化形成副产物 至7℃,反应时间为10〜15分钟,相对高温为80〜100℃左右。 该过程可以持续进行。

    Continuous process for the preparation of N-monomethylamide of
O,O-dimethyl-dithiophosphoryl acetic acid
    3.
    发明授权
    Continuous process for the preparation of N-monomethylamide of O,O-dimethyl-dithiophosphoryl acetic acid 失效
    用于制备O,O-二甲基 - 二硫代磷酰基乙酸的N-单甲基酰胺的连续方法

    公开(公告)号:US4083900A

    公开(公告)日:1978-04-11

    申请号:US741990

    申请日:1976-11-15

    IPC分类号: C07F9/165

    CPC分类号: C07F9/1651

    摘要: The N-monomethylamide of O,O-dimethyl-dithiophosphorylacetic acid is prepared continuously, in the form of essentially pure, beautiful colorless crystals, by reacting the methyl ester of O,O-dimethyldithiophosphoryl acetic acid with a 34% aqueous solution of methylamine (CH.sub.3 NH.sub.2) at a temperature between 0.degree. C and 10.degree. C, in water containing a surfactant which is an alkyl sulphonate or an alkylarylsulphonate and, as an essential feature of the process, recycling, back to the reaction vessel, from 1/10 to 1/20 of the slurry obtained as a result of the reaction between the methyl ester of O,O-dimethyl-dithiophosphorylacetic acid and the 34% solution of CH.sub.3 NH.sub.2.

    摘要翻译: 通过使O,O-二甲基二硫代磷酰基乙酸的甲酯与34%的甲胺水溶液反应,连续制备O,O-二甲基 - 二硫代磷酰基乙酸的N-单甲基酰胺,其形式为基本上纯的,美丽的无色结晶 CH 3 NH 2)在0℃至10℃之间的温度下,在含有烷基磺酸盐或烷基芳基磺酸盐的表面活性剂的水中,并且作为该方法的基本特征,回收至反应容器,从1/10至 作为O,O-二甲基 - 二硫代磷酰基乙酸的甲酯与34%的CH 3 NH 2溶液之间的反应得到的浆液的1/20。