| abstract |
The invention relates to a process for preparing semicarbazone compounds of the formula I, where R 1 and R 2 are each independently hydrogen, halogen, CN, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -haloalkyl or C 1 -C 4 -haloalkoxy, and R 3 is C 1 -C 4 -alkoxy, C 1 -C 4 -haloalkyl or C 1 -C 4 -haloalkoxy, by reacting a hydrazone compound of the general formula II, where R is C 1 -C 4 -alkoxy, amino, C 1 -C 4 -alkylamino or di(C 1 -C 4 -alkyl)amino, and R 1 , R 2 are each as defined above, with an aniline compound of the general formula III where R 3 is as defined above. |