申请人:Hoechst Aktiengesellschaft
公开号:US05565612A1
公开(公告)日:1996-10-15
The present invention relates to substituted 2-chloro-3,4,5-trifluorobenzenes of the formula ##STR1## in which R is NO.sub.2, NH.sub.2, CN or Cl, and to a process for the preparation of substituted 2-chloro-3,4,5-trifluorobenzenes of the formula given above, in which R is NO.sub.2, NH.sub.2, CN, Cl or Br, which involves reacting 2,3,4-trifluorochlorobenzene with a nitrating agent in the presence or absence of a water-insoluble solvent at from -10.degree. C. to 50.degree. C., reducing 2-chloro-3,4,5-trifluoronitrobenzene or a mixture which contains 2-chloro-3,4,5-trifluoronitrobenzene and 5-chloro-2,3,4-trifluoronitrobenzene, in the presence of an organic solvent, isolating 2-chloro-3,4,5-trifluoroaniline or a mixture which contains 2-chloro-3,4,5-trifluoroaniline and 5-chloro-2,3,4-trifluoroaniline, diazotizing this product, if desired, and exchanging the diazotized group for a chloride atom, bromide atom or cyanide radical.
本发明涉及一种公式为##STR1##的取代2-氯-3,4,5-三氟苯,其中R为NO.sub.2,NH.sub.2,CN或Cl,以及制备上述公式中R为NO.sub.2,NH.sub.2,CN,Cl或Br的取代2-氯-3,4,5-三氟苯的方法,包括在-10℃至50℃下,在有机溶剂的存在或不存在下,将2,3,4-三氟氯苯与硝化剂反应,还原2-氯-3,4,5-三氟硝基苯或含有2-氯-3,4,5-三氟硝基苯和5-氯-2,3,4-三氟硝基苯的混合物,在有机溶剂的存在下分离2-氯-3,4,5-三氟苯胺或含有2-氯-3,4,5-三氟苯胺和5-氯-2,3,4-三氟苯胺的混合物,如有需要,重氮化该产品,并交换重氮化基团以获得氯原子,溴原子或氰基。