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US 2014/0155620 A1Published application
Fipronil production process
AssigneeIrvita Plant Protection, A Branch of Celsius Property B.V
InventorsAnat LEVIN, Michael GRABARNICK
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Abstract
An improved oxidation process for preparing 5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylsulphinyl-pyrazole, of formula (I) is described. The process includes admixing 5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylthiopyrazole of formula (II) with dichloroacetic acid and hydrogen peroxide in the presence of a strong acid.
Claims9
A process for preparing 5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylsulphinyl-pyrazole, fipronil, of formula (I)
- wherein the process comprises:
- admixing 5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylthiopyrazole of formula (II)
- with dichloroacetic acid and hydrogen peroxide in the presence of a strong acid;
- quenching the reaction mixture;
- isolating the compound of formula (I);
- and optionally purifying the obtained compound of formula (I).
3 more elements
Dependencies are inferred from the claim text.