反应详情

104.54 g (0.5 mol) of ethyl 5-bromovalerate and 137.5 g (0.525 mol) of triphenyl phosphine were refluxed for 36 hours in 1 l of acetonitrile. After the reaction terminated, 500 ml of acetonitrile was distilled off, then the reaction mixture was dried. Under nitrogen atmosphere, 50.1 g (0.5 mol) of 2-methyl valeraldehyde was added, then the reaction mixture was stirred. Controlling the reaction temperature to within the range of 25°-35° C., 20.0 g (0.5 mol) of oily (60%) sodium hydride was added little by little. After the addition, the reaction mixture was stirred over night at room temperature. After the reaction ended, 250 g of water was added into the reaction mixture, then oil layer was separated and the water layer was extracted three times with 150 ml of hexane. The organic layers were combined and washed with 150 ml of water. After the hexane solution was dried sufficiently with anhydrous Magnesium sulfate, solvent was removed under reduced pressure, and distilled to obtain 57.3 g of ethyl 7-methyl-5-decenoate (Yield: 54%, based upon starting material). The product was gradually added dropwise into 500 ml of dried ethylether solution including 5.12 g (0.135 mol) of aluminum lithium hydride under nitrogen stream. The dropwise addition was done while a reaction vessel was cooled sufficiently by ice water. After the addition was completed, the reaction temperature was returned to room temperature and stirred for 2 hours. Then, 300 ml of water was added gradually into the reaction mixture, and the organic layer was separated. The water layer was returned to pH7 and extracted three times with 100 ml of diethylether. The organic layers were combined and washed with 100 ml of water, and solvent was removed from the reaction mixture under reduced pressure to obtain 44.2g of 7-methyl-5-decen-1-ol (Yield: 52", based upon starting material).

1. customAfter the reaction terminated
2. distillation500 ml of acetonitrile was distilled off
3. customthe reaction mixture was dried
4. additionwas added little by little
5. additionAfter the addition
6. stirringthe reaction mixture was stirred over night at room temperature
7. customoil layer was separated
8. extractionthe water layer was extracted three times with 150 ml of hexane
9. washwashed with 150 ml of water
10. dry with materialAfter the hexane solution was dried sufficiently with anhydrous Magnesium sulfate, solvent
11. customwas removed under reduced pressure
12. distillationdistilled