反应详情

Phosphorus tribromide (2.17 g) was added, dropwise, to a solution of 3,4-dichlorophenethyl alcohol (4.26 g) in carbon tetrachloride (30 ml). The mixture was stirred at room temperature for 10 minutes then heated under reflux for 2 hours. 5% Aqueous sodium carbonate (10 ml) was added dropwise and the mixture was extracted with dichloromethane (3×70 ml). The combined dichloromethane extracts were dried (MgSO4) and concentrated in vacuo to give a yellow oil which was purified by column chromatography on silica eluting with dichloromethane containing hexane (30% down to 0%). The product-containing fractions were combined and concentrated in vacuo to give the title compound as a colourless oil, yield, 1.8 g.

1. temperaturethen heated
2. temperatureunder reflux for 2 hours
3. extractionthe mixture was extracted with dichloromethane (3×70 ml)
4. dry with materialThe combined dichloromethane extracts were dried (MgSO4)
5. concentrationconcentrated in vacuo
6. customto give a yellow oil which
7. customwas purified by column chromatography on silica eluting with dichloromethane
8. additioncontaining hexane (30% down to 0%)
9. concentrationconcentrated in vacuo