Process for preparation of cyclopropane carboxylic acids

本发明提供了在催化剂存在下，由通式(I)化合物与供氢体化合物反应制备式(II)环丙烷羧酸中间体的方法，其中式(II)中的R#-[1]代表卤素，优选Cl或Br，或卤代烷基，优选CF#-[3]，以及X#-[2]代表卤素，优选Cl或Br，其中R#-[1]和X#-[2]可以相同或不同，而且对于其中R#-[1]＝CF#-[3]和X#-[2]＝Cl来讲，II的构型主要为Z型；式(I)中的R#-[1]和X#-[2]如上定义，且X#-[1]代表卤素，优选Cl或Br，而且R#-[1]，X#-[1]和X#-[2]可以相同或不同。∴Z或E∴ Preparation of cyclopropane carboxylic acids usable as intermediates and of formula (II), wherein R1 represents halogen, preferably Cl or Br, or haloalkyl, preferably CF3, and X2 represents halogen, preferably Cl or Br, where R1 or X2 may be the same or different, and wherein the configuration of (II) is predominantly Z for R1=CF3 and X2=Cl; by reacting, in the presence of a catalyst, a compound of formula (I), wherein R1 and X2 are as defined, and X1 represents halogen, preferably Cl or Br, where R1, X1 and X2 may be the same or different, with a compound which is a hydrogen donor.