Method for producing 3,5-bis(fluoroalkyl)-pyrazol-4-carboxylic acid derivatives and 3,5-bis(fluoroalkyl)-pyrazoles

Process for preparing 3,5-bis(fluoroalkyl)pyrazole of formula (Ia) and (Ib)

• in which
• R1 is selected from the group consisting of H, C1-12-alkyl, C3-8-cycloalkyl, C6-18-aryl, C7-19-arylalkyl or C7-19-alkylaryl, CH2CN, CH2CX3, CH2COOH, and CH2COOH—(C1-12)-alkyl, and
• X is independently F, Cl, Br, or I;
• R2 and R3 is each independently selected from C1-C6-haloalkyl groups;
• R4 is selected from the group consisting of H, Hal, COOH, (C═O)OR5, CN and (C═O)NR5R6, where R5 and R6 are each independently selected from the group consisting of C1-12-alkyl, C3-8-cycloalkyl, C6-18-aryl, C7-19-arylalkyl and C7-19-alkylaryl, or where R5 and R6 together with the nitrogen atom to which they are bonded may form a five- or six-membered ring;
• comprising
• in step A), reacting an α,α-dihaloamine of formula (II)
• in which X is Cl or F with a compound of formula (III)
• in which the R2 and R3 radicals are each as defined above and,
• in B), reacting the product thereof with a hydrazine of formula (IV)
• in which R1 is as defined above.