PROCESS FOR PREPARING 3,5-BIS(FLUOROALKYL)PYRAZOLE DERIVATIVES FROM a,a-DIHALOAMINES

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

• in which
• R1 and R3 are each independently selected from C1-C6-haloalkyl, optionally halogen substituted C1-C6-alkylphenyl;
• R2 is selected from H, halogen, COOH, (C═O)OR4, CN and (C═O)NR4R5;
• R4 and R5 are each independently selected from C1-12-alkyl, C3-8-cycloalkyl, C6-18-aryl, C7-19-arylalkyl and C7-19-alkylaryl or where
• R4 and R5 together with the nitrogen atom to which they are bonded may form a four-, five- or six-membered ring;
• comprising reacting, in (A), a α,α-dihaloamine of formula (II),
• in which
• X is independently selected from F, Cl or Br;
• R8 and R9 are each independently selected from C1-12-alkyl, C3-8-cycloalkyl, C6-18-aryl, C7-19-arylalkyl and C7-19-alkylaryl or where
• R8 and R9 together with the nitrogen atom to which they are bonded may form a five- or six-membered ring;
• R1 is as defined above;
• with one or more compounds of formula (III),
• in which
• R6 and R7 are each independently selected from C1-12-alkyl, C3-8-cycloalkyl, C6-18-aryl, C7-19-arylalkyl and C7-19-alkylaryl or where
• R6 and R7 together form a five- or six-membered ring;
• R2 and R3 are as defined above
• to form the compound of formula (V)
• in which the radicals are as defined above
• and in (B) in the presence of an acid, a cyclyzation of (V) takes place.