申请人:——
公开号:US20040102505A1
公开(公告)日:2004-05-27
The present invention relates to a process for preparing 1-substituted 5-chloro-4-methylpyrazoles of the general formula I
1
with the meaning for R stated in claim 1, in which a 4-methylpyrazole of the formula II
2
is reacted with chlorine, the resulting mixture of monochlorinated and dichlorinated product is fractionated by distillation, and subsequently the dichlorinated compound is dehalogenated to compound II and returned to the reaction with chlorine.
本发明涉及一种制备通式I1中R的含义如权利要求1所述的1-取代-5-氯-4-甲基吡唑的方法,其中使用式II2的4-甲基吡唑与氯反应,得到单氯化和双氯化产物的混合物,通过蒸馏分馏分离,随后对双氯化合物进行脱卤反应得到化合物II并返回到与氯反应的反应中。