申请人:Bayer AG
公开号:US06613948B1
公开(公告)日:2003-09-02
2,3,4,5-tetrafluorobenzene derivatives can be obtained in a particularly advantageous manner by reacting the corresponding chlorobenzene or (chloro, fluoro)-benzene derivatives with a fluorinating agent in the presence of a solvent and a catalyst at elevated temperature, which comprises carrying out the reaction initially under temperature and pressure conditions such that the respective 2,3,4,5-tetrafluoro-benzene derivative continuously distills off through a column, and subsequently setting temperature and pressure conditions such that residual fractions of the 2,3,4,5-tetrafluorobenzene derivative distill off with the corresponding 2,3,4-trifluoro-5-chloro compound.
通过在溶剂和催化剂的存在下,在升高的温度下,将相应的氯代苯或(氯,氟)-苯衍生物与氟化剂反应,可以特别优越地获得2,3,4,5-四氟苯衍生物。该方法包括最初在温度和压力条件下进行反应,使得相应的2,3,4,5-四氟苯衍生物通过柱子连续蒸馏出来,然后设置温度和压力条件,使得残留的2,3,4,5-四氟苯衍生物与相应的2,3,4-三氟-5-氯化合物一起蒸馏出来。