Methyl acetoacetate → Methyl 2-acetyloctanoate

반응식

[C:1]([O:7][CH3:8])(=[O:6])[CH2:2][C:3]([CH3:5])=[O:4].C[O-].[Na+].Br[CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH3:18]>CO>[C:3]([CH:2]([CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH3:18])[C:1]([O:7][CH3:8])=[O:6])(=[O:4])[CH3:5]

참가 물질

실험 절차

465 g of methyl acetoacetate were added dropwise under nitrogen and stirring to 720 g of 30% sodium methylate solution in 1200 ml of methanol. Then, 727 g of 1-bromohexane were added and the reaction mixture was boiled at reflux for 20 hours. The majority of the methanol was distilled off and the residue was poured on to ice-water. The mixture was extracted with n-hexane and then with water. The organic phases were combined and dried over sodium sulphate. The solvent was evaporated and the crude ester was distilled. There were obtained 499.4 g of methyl 2-acetyloctanoate, b.p. 124°-128°/15 Torr.