反应详情

温度

-10 °C

A solution of phosphorus tribromide (1.02 cm3 ; 0.0105 m) in 40 to 60 petroleum ether (5 cm3) was added dropwise to a solution of 2-cyclooctenylcarbinol (2.8 g; 0.02 m) (fraction 9 above) and AR. Pyridine (0.104 g; 0.0013 m) in petroleum ether (15 cm3) stirred and cooled to -10° C. After addition the mixture was allowed to warm to room temperature and stood for 2 days. The reaction mixture was treated with water (50 cm3) and the organic layer separated. The aqueous layer was extracted with 40 to 60 petroleum ether (3×25 cm3) and the combined organic layer and petrol extracts washed with 2 N-NaOH (25 cm3) and water (25 cm3). The petrol extracts were combined and dried over anhydrous MgSO4 and the solvent removed under vacuum to leave a crude product 2.3 g. The crude product was distilled to give 0.7 g of pure product b.p. 48°-50°/0.25 mmHg.

1. additionAfter addition the mixture
2. temperatureto warm to room temperature
3. customthe organic layer separated
4. extractionThe aqueous layer was extracted with 40 to 60 petroleum ether (3×25 cm3)
5. washthe combined organic layer and petrol extracts washed with 2 N-NaOH (25 cm3) and water (25 cm3)
6. dry with materialdried over anhydrous MgSO4
7. customthe solvent removed under vacuum
8. customto leave a crude product 2.3 g
9. distillationThe crude product was distilled