反应详情

To a suspension of 1.79 g (0.041 mol) sodiumhydride in 50 ml tetrahydrofurane and 50 ml dimethylformamide were added 13.9 g (0.041 mol) (cyanomethyl)triphenylphosphonium chloride. After sirring for 1 hour at room temperature a solution of 5.54 g (0.041 mol) 2-ethyl-4-pyridinecarboxaldehyde in 10 ml tetrahydrofuran were added and stirring was continued for 15 hours. Then 10 ml methanol were added, the solvents were evaporated and the residue chromatographed on aluminiumoxide with dichloromethane to yield 1.63 g (25%) (E)-3-(2-ethyl-pyridin-4-yl)-acrylonitrile as white waxy solid. MS m/e (%): 158 (M+, 100).

1. waitwas continued for 15 hours
2. customthe solvents were evaporated
3. customthe residue chromatographed on aluminiumoxide with dichloromethane