Process for preparing 4-trifluoromethylsulphinylpyrazole...

Details Process for preparing 4-trifluoromethylsulphinylpyrazole... Process for preparing 4-trifluoromethylsulphinylpyrazole...

C - Chemistry, Metallurgy

07

D

C07D 231/44 (2006.01) C07D 401/04 (2006.01)

Patent

CA 2384283

A process for the preparation of a compound of formula (1), R1 represents halogen, haloalkyl, haloalkoxy, R4S(O)n-, or -SF5; R2 represents hydrogen or halogen; R3 represents halogen; R4 represents alkyl or haloalkyl; and n represents 0, 1 or 2; which process comprises oxidising a compound of formula (II); wherein R1, R2 and W are as defined above, with trifluoroperacetic acid in the presence of a corrosion inhibiting.

On décrit un procédé de préparation d'un composé de formule (I). Dans la formule, R<1> représente halogène, haloalkyle, haloalcoxy, R<4>S(O)n- ou -SF5; R<2> représente hydrogène ou halogène; R<3> représente halogène; R<4> représente alkyle ou haloalkyle; et n représente 0, 1 ou 2. Le procédé consiste à oxyder un composé de formule (II) dans laquelle R<1>, R<2> et W sont tels que définis ci-avant, avec de l'acide trifluoroperacétique en présence d'un composé inhibant la corrosion.

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