3-(Dimethylamino)-2-[3-(trifluoromethyl)phenyl]prop-2-enal → 1-(2-Hydroxybutyl)-4-(m-trifluoromethylphenyl)-pyrazole

Beteiligte Stoffe

Reaktionsschritte

A mixture of 10 g. of 2-(m-trifluoromethylphenyl)-3-dimethylaminoacrolein, 5 g. of 2-hydroxybutylhydrazine and 100 ml. of benzene is refluxed for 2.5 hours. The benzene is evaporated off, ether added, and the reaction mixture cooled to obtain a precipitate which is recovered by filtering, washed with pentane, dissolved in methylene chloride, dried, treated with charcoal and filtered. The resulting solution is treated by addition of pentane and the resulting precipitate recovered by filtering, washed with pentane and dried under reduced pressure to obtain 1-(2-hydroxybutyl)-4-(m-trifluoromethylphenyl)-pyrazole, m.p. 77°-79°C.

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