Methanol → 3,7-Dimethyl-2-phenyl-octa-2,6-diene nitrile

反応式

[CH3:1][C:2]([CH3:9])=[CH:3][CH2:4][CH2:5][C:6](=O)[CH3:7].[CH2:10]([C:17]#[N:18])[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.[OH-].[K+].CO>>[CH3:7][C:6]([CH2:5][CH2:4][CH:3]=[C:2]([CH3:9])[CH3:1])=[C:10]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[C:17]#[N:18]

参加物

反応物 4

HCID 887Methanol

HCID 8794Phenylacetonitrile

HCID 98626-Methyl-5-hepten-2-one

HCID 14797Potassium Hydroxide

生成物 1

HCID 675271983,7-Dimethyl-2-phenyl-octa-2,6-diene nitrile収率 24%

実験手順

To the mixture of 6-methyl-hept-5-en-2-one (90.86 g, 0.72 mol) and benzyl cyanide (46.8 g, 0.40 mol) is added dropwise a 4 N solution of KOH in MeOH (25.0 ml, 0.10 mol). The resulting suspension is heated to reflux during 4.5 h. Then methanol is removed by distillation and the residue is washed with 6 N aq. HCl-solution, then water, sat. aq. NaHCO3-solution and brine. The organic layer is dried over MgSO4, the solvent removed under reduced pressure and the residue distilled twice over a Widmer column to yield 3,7-Dimethyl-2-phenyl-octa-2,6-diene nitrile (21.5 g, 24%, (E/Z) mixture) as a colourless oil (b.p. 122DC/0.1 mbar).