Hydrogen Peroxide → HCID 11079417, compound

Participants

Reaction Steps

2.8 g (0.0413 mol) of 50% strength hydrogen peroxide were added to a mixture of 10 g (0.0275 mol) of 4-nitro-5-propionamido-1-(3-chloro-5-trifluoromethyl-2-pyridyl)pyrazole and 100 ml of trifluoroacetic acid at 20° C. with stirring in the course of 5 minutes and it was stirred at 25° C. for 14 hours. The reaction mixture was poured onto 500 ml of water and extracted 3× with methylene chloride. The organic phase was washed with water, sodium hydrogencarbonate and saturated sodium chloride solution in succession and dried over magnesium sulfate. After concentrating under reduced pressure, stirring with ether/pentane, filtering off with suction and drying, 9.0 g (85% of theory) of 4-nitro-5-propionamido-1-(3-chloro-5-trifluoromethyl-(N-oxido)-2-pyridyl)pyrazole of m.p. 143-146° C. were obtained.

Provenance & Evidence