申请人:Wang Dongchao
公开号:US20070055075A1
公开(公告)日:2007-03-08
Methods for preparing 2,3,5,6-tetrafluorodimethylolbenzene, an intermediate for the preparation of pyrethroids, are disclosed. A method for preparing 2,3,5,6-tetrafluorodimethylolbenzene includes the reduction of tetrafluoroterephthalate. Various reduction processes are disclosed, which are simple and safe and can afford the product in high yield and purity. Processes for preparing tefluthrin from 2,3,5,6-tetrafluorodimethylolbenzene, by halogenation, hydrogenation, and esterification, are also disclosed.
本文公开了制备拟除虫菊酯中间体2,3,5,6-四氟二甲醇苯的方法。其中一种制备2,3,5,6-四氟二甲醇苯的方法包括四氟对苯二甲酸酯的还原。本文还公开了多种还原工艺,这些工艺简单安全,能够高产高纯地制得产物。本文还公开了通过卤化、氢化和酯化制备特氟氰菊酯的工艺,其中以2,3,5,6-四氟二甲醇苯为原料。