| abstract |
The present invention relates to a process for preparing 1,3-substituted pyrazole compounds of the formula I n nin whichn X is especially a CX 1 X 2 X 3 group in which X 1 , X 2 and X 3 are each independently especially hydrogen, fluorine or chlorine, R 1 is C 1 -C 4 -alkyl or cyclopropyl, andn R 2 is hydrogen, CN or a CO 2 R 2a group in which n R 2a is especially C 1 -C 6 -alkyl, comprising the following steps: i) reacting a compound of the formula II with a hydrazone of the formula III nn n n n n n n n n n n n where the variables X and R 2 in formula II are each as defined for formula I, n Y is oxygen, an NR y1 group or an [NR y2 R y3 ] + Z − group, n R 3 is OR 3a or an NR 3b R 3c group, n and where the variable R 1 in formula III is as defined for formula I, n R 4 and R 5 are each independently hydrogen, C 1 -C 6 -alkyl, optionally substituted phenyl, where at least one of the R 4 and R 5 radicals is different from hydrogen, and where n R 4 and R 5 together with the carbon atom to which they are bonded may also be a 5- to 10-membered saturated carbocycle; n n n ii) treating the reaction product obtained with an acid in the presence of water. |