反应详情

8.4 g of a monohydrate of hydrazine and 45 g of 4-(3-butenyl)benzaldehyde were dissolved in 80 ml of methanol. The mixture was stirred at room temperature for 2 hours. To the mixture was then added 150 ml of dichloromethane. The mixture was then washed with saturated aqueous solution of sodium bicarbonate twice. The mixture was then dehydrated and dried over anhydrous sodium sulfate. The solvent was then distilled off under reduced pressure. The resulting crude reaction product was purified through basic alumina column chromatography, and then recrystallized from methanol to obtain 42 g of 1,2-bis[4-(3-butenyl)benzylidene]hydrazine. The compound thus obtained had a melting point of 57° C. and exhibited nematic phase up to 116° C.

1. washThe mixture was then washed with saturated aqueous solution of sodium bicarbonate twice
2. dry with materialdried over anhydrous sodium sulfate
3. distillationThe solvent was then distilled off under reduced pressure
4. customThe resulting crude reaction product
5. customwas purified through basic alumina column chromatography
6. customrecrystallized from methanol