Process for the preparation of 4-sulfinyl-pyrazole derivatives
AssigneeBASF SE
InventorsAlexander Korte, Paul Hornung
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Abstract
The present invention relates to a novel process for the preparation of a compound of formula (I), wherein R1, R2, R3, R4 and R5 are each independently selected from hydrogen, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, nitro, cyano, and pentafluorothio; R6 is C1-C4-alkyl, or C1-C4-haloalkyl; by oxidation of a compound of formula (II) with an oxidation agent selected from trifluoroperacetic acid and trichloroperacetic acid in the presence of a catalyst selected from hydroxides, oxides, sulfates, acetates or trifluoroacetates of lithium, magnesium, calcium, strontium, barium, titanium (IV), zinc (II) and manganese (II).
Claims19
A process for preparing a compound of formula (I),
- wherein
- R1, R2, R3, R4 and R5 are each independently selected from the group consisting of hydrogen, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, nitro, cyano, and pentafluorothio;
- and
- R6 is C1-C4-alkyl or C1-C4-haloalkyl;
- comprising oxidizing a compound of formula (II)
- with an oxidation agent selected from the group consisting of trifluoroperacetic acid and trichloroperacetic acid in the presence of a catalyst selected from the group consisting of hydroxides, oxides, sulfates, acetates or trifluoroacetates of lithium, magnesium, calcium, strontium, barium, titanium (IV), zinc (II) and manganese (II).
Dependencies are inferred from the claim text.