Processes for preparation of dithiocarbazates
    5.
    发明授权
    Processes for preparation of dithiocarbazates 失效
    二硫代肼基甲酸酯的制备方法

    公开(公告)号:US5466854A

    公开(公告)日:1995-11-14

    申请号:US386867

    申请日:1995-02-10

    CPC分类号: C07D231/18 C07C337/04

    摘要: The present invention relates to a process for preparation of 5-pyrazolemercaptan derivatives represented by the following general formula (I), which is useful for synthesis of sulfonylurea-based herbicides, and an intermediate thereof, ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl,R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, or a phenyl group which can contain one or more substituent selected from the group consisting of halogen, nitro and methyl at an optional position, andR.sup.3 represents hydrogen, methyl, ethyl or phenyl.

    摘要翻译: 本发明涉及一种制备由以下通式(I)表示的5-吡唑硫醇衍生物的方法,其用于合成磺酰脲类除草剂及其中间体,其中R1表示氢 ,C 1 -C 4烷基,烯丙基或炔丙基,R 2表示氢,C 1 -C 4烷基或可以在任选位置含有一个或多个选自卤素,硝基和甲基的取代基的苯基,R 3表示氢 ,甲基,乙基或苯基。