Bayer Cropscience S.a.

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

Isabelle Pelta

Jean-Louis Clavel

Sylvie Le Bars

Philippe Charreau

Jean-Claude Maret

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.

Process for preparing 4-trifluoromethylsulfinylpyrazole derivative

The invention concerns chiral amino acid, is preparation method, and the use of said chiral amino acid as intermediate for the synthesis of chiral organic compounds.

Chiral (s- or r-methylphenylglycine) amino acid crystal and method for preparing same

The invention concerns a novel method for preparing chiral amino acids of formula (I) characterised in that it consists in contracting a racemic hydantoin of formula (II) with an enantiomeric splitting agent.

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Chassieu, France

Isabelle Pelta