反应详情

80 grams 1-phenyl-3-(p-chlorophenyl)-pyrazol-4-aldehyde were dissolved in a mixture of 800 milliliters ethanol and 1200 milliliters dimethylformamide. To the solution thus obtained, 5.5 grams 95% sodium borohydride were added in small portions at 20°-25° C. The mixture was then stirred for one hour at room temperature. Thereafter, the reaction mixture was evaporated and the residue was taken up, with rubbing, with ethanol and water were thereafter added. The precipitate formed thereby was separated, dispersed and stirred in warm water, the precipitate was filtered off by suction, dried and recrystallized from benzene. 75 grams 4-hydroxymethyl-1-phenyl-3-(p-chlorophenyl)-pyrazol, melting at 141°-142° C., were obtained, representing a yield of 93%.

1. customTo the solution thus obtained
2. customThereafter, the reaction mixture was evaporated
3. additionwere thereafter added
4. customThe precipitate formed
5. customthereby was separated
6. additiondispersed
7. stirringstirred in warm water
8. filtrationthe precipitate was filtered off by suction
9. customdried
10. customrecrystallized from benzene