Bayer Cropscience S.a.

Basf Agro B.v., Arnhem (nl), Wadenswil-branch

Philippe Charreau

Isabelle Pelta

Jean-Louis Clavel

Sylvie Le Bars

A process for the preparation of a compound of formula (I)comprising oxidizing a compound of formula (II)with trifluoroperacetic acid in the presence of a corrosion inhibiting compound such as boric acid. Also, a process for preparing a compound of formula (II) by adding sulfur dioxide to a mixture of the corresponding disulfide, a formate salt, trifluoromethyl bromide and a polar solvent; and a process for preparing the disulfide comprising adding SClto a solution, in an organic solvent, of the corresponding 4-unsubstituted pyrazole.

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Sainte Foy Les Lyon, France

Philippe Charreau