Reaction #586138

Reaction equation

[2-methyl-5-(3-trifluoromethylpyrazolyl)phenyl] 2,2,2-trifluoroethyl sulfide

sodium sulfite

→

[2-methyl-5-(3-trifluoromethylpyrazolyl)phenyl] 2,2,2-trifluoroethyl sulfoxide

Yield 37.1%

Solvents

chloroform

chloroform

Conditions

Workup

1. 1
   workup.STIRRINGthe reaction mixture was stirred at 0° C. for 1 hour
2. 2
   workup.STIRRINGstirred at room temperature for 10 minutes
3. 3
   WashThe chloroform layer was washed with 20 ml of saturated aqueous sodium hydrogen carbonate three times
4. 4
   Dryingdried over anhydrous magnesium sulfate
5. 5
   workup.DISTILLATIONthe chloroform was distilled off under reduced pressure

Procedure

To 1.68 g (4.9 mmol) of [2-methyl-5-(3-trifluoromethylpyrazolyl)phenyl] 2,2,2-trifluoroethyl sulfide (Compound No. V-292 of the present invention) in 5 ml of chloroform, 1.02 g (5.1 mmol) of m-chlotoperbenzoic acid was added at 0° C. with stirring, and the reaction mixture was stirred at 0° C. for 1 hour. The reaction solution was mixed with 10 ml of 10% aqueous sodium sulfite and stirred at room temperature for 10 minutes, and then 20 ml of chloroform was added. The chloroform layer was washed with 20 ml of saturated aqueous sodium hydrogen carbonate three times and dried over anhydrous magnesium sulfate, and the chloroform was distilled off under reduced pressure to obtain 0.65 g of [2-methyl-5-(3-trifluoromethylpyrazolyl)phenyl] 2,2,2-trifluoroethyl sulfoxide (yield 37.1%) as a pale yellow solid (m.p. 109-110° C.).

Source