Water → HCID 13914154, compound

Participants

Reaction Steps

1.0 g (0.015 mol) of sodium azide is added to 3.0 g (0.007 mol) of 5-bromo-4-nitro-1-(2,3,6-trichloro-4-trifluoromethyl-phenyl)-pyrazole in 50 ml of dimethylsulphoxide, the mixture is stirred at room temperature for 15 hours, poured into 150 ml of water and extracted several times with chloroform and ethyl acetate, the combined organic phases are dried over magnesium sulphate and concentrated in vacuo and the oily crude produc is purified by chromatography (silica gel; mobile phase: chloroform/acetone 9:1). 0.68 g (24% of theory) of 5-azido-4-nitro-1-(2,3,6-trichloro-4-trifluoromethyl-phenyl)-pyrazole of melting point 84° C.-88° C. is obtained.

Provenance & Evidence