METHOD FOR THE SYNTHESIS OF 5-AMINO, 1-PHENYL, 3-CYANO, 4-TRIFLUOROMETHYL SULFINYL PYRAZOLE

摘要

The present invention relates to a method for the preparation of the 5-amino, 1-phenyl, 3-cyano, 4- trifluoromethyl sulfinyl pyrazole having the described general formula (I), particularly preferred for the synthesis of Fipronil, through oxidation of a compound having the general formula (II) as follows: (II) wherein R1 and R2 are independently hydrogen or halogen, and wherein the oxidising agent is dichloroperacetic acid.