Improved synthesis of 4-methyl-3-thiosemicarbazide
    5.
    发明公开
    Improved synthesis of 4-methyl-3-thiosemicarbazide 失效
    改进的4-甲基-3-硫代吗啉的合成

    公开(公告)号:EP0339964A3

    公开(公告)日:1991-06-12

    申请号:EP89304150.9

    申请日:1989-04-26

    申请人: DowElanco

    IPC分类号: C07C337/00

    CPC分类号: C07C337/06

    摘要: An improved method for preparing 4-methyl-3-­thiosemicarbazide, an intermediate of value in preparing certain herbicides, by reacting a methyldithiocarbamate quaternary ammonium salt of formula:
    CH₃NH- -NHNH₂
    which comprises reacting a methyldithiocarbamate quaternary ammonium salt of Formula (I):
    wherein R is C₁-C₄ alkyl, with hydrazine.