Nitric Acid → HCID 13913350, compound

Participants

Reaction Steps

2.4 ml (0.0258 mol) of acetic anhydride and 1.1 ml (0.025 mol) of 98% strength nitric acid are added in succession to 10 g (0.0235 mol) of 5-trifluoroacetamido-1-(2,3,6-trichloro-4-trifluoromethylphenyl)-pyrazole in 20 ml of glacial acetic acid at room temperature. After the mixture has been stirred for 20 hours, it is concentrated in vacuo, the residue is taken up in 100 ml of methylene chloride and the mixture is extracted with 400 ml of 5% strength aqueous sodium carbonate solution. The aqueous phase is acidified and extracted with 200 ml of methylene chloride. The combined organic phases are dried over magnesium sulphate and freed from the solvent in vacuo. 8.6 g (77.6% of theory) of 4-nitro-5-trifluoroacetamido-1-(2,3,6-trichloro-4-trifluoromethylphenyl)-pyrazole of melting point 136° C.-137° C. are obtained.

Provenance & Evidence