Gharda Chemicals Limited

Laxminarayan Shet

Keki Hormusji Gharda

Diwakar Shenoy

Abhijeet Suresh Kawade

Sachin Bhiku Jadhav

Sandip Kedare

Yatin Samangadkar

A process for the synthesis of fipronil, which is a broad spectrum insecticide of the following chemical structure, is provided. The process provides fipronil with a yield in the range of 75% to 90% and purity in the range of 95% to 97%. By the process, the observed amount of sulfone impurity i.e., 5-amino-1-(2,6-dichloro-4-trifluoromethylphenyl)-3-cyano-4-trifluoro methylsulfonyl pyrazole in fipronil is in the range of 0% to 0.5%.

Process for synthesis of Fipronil

A process for the preparation of trifluoromethanesulfinyl chloride is provided. Trifluoromethanesulfinyl chloride is used as an intermediate for preparing pesticides and insecticides. Trifluoromethanesulfinyl chloride is represented by Formula I: The process for the preparation of trifluoromethanesulfinyl chloride employs readily available reagents and does not involve formation of toxic by-products, and is thus a simple, economic, and environmental-friendly process for the preparation of trifluoromethanesulfinyl chloride.

Process for preparation of trifluoromethanesulfinyl chloride

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Maharashtra, India

Laxminarayan Shet