Water → HCID 178482487, compound

Participants

Reaction Steps

3-Formamido-1-(3-trifluoromethylphenyl)-2-pyrazoline (2.4 g) was stirred with dry diethyl ether (60 ml) to produce a slurry which was gradually added to a stirred ice-cold suspension of lithium aluminium hydride (1.0 g) in dry diethyl ether (75 ml) under a nitrogen atmosphere. The addition took place over a period of about 20 minutes and was accompanied by a vigorous reaction. The final reaction mixture was stirred for a further 15 minutes and was then carefully and slowly decomposed by the addition of water (30 ml). The ethereal layer was then decanted off the aqueous sludge which was washed twice with diethyl ether. The combined ethereal solutions were dried over potassium carbonate, filtered and evaporated. The resulting 3-methylamino-1-(3-trifluoromethylphenyl)-2-pyrazoline was a colourless crystalline solid on precipitation by benzene and recrystallization with light petroleum, yield 1.8 g, m.p. 93.1°. The hydrochloride was recrystallized by precipitation from methanol with ether and light petroleum m.p. 206°-207°.

Provenance & Evidence