反应详情

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.

1. temperatureat reflux for 20 hours
2. distillationThe majority of the methanol was distilled off
3. additionthe residue was poured on to ice-water
4. extractionThe mixture was extracted with n-hexane
5. dry with materialdried over sodium sulphate
6. customThe solvent was evaporated
7. distillationthe crude ester was distilled