反应详情

To a solution of 3-(fluoro)phenethyl alcohol (3.8 g, 27.0 mmol), in anhydrous dichloromethane (100 ml), cooled to 0° C., was added carbon tetrabromide (11.25 g, 34.0 mmol) and triphenylphosphine (10.62 g, 41.0 mmol). After stirring for 0.5 h the solvent was removed in vacuo and diethyl ether (100 ml) was added to the residue. The resultant precipitate was removed by filtration, the filtrate evaporated under reduced pressure and the crude product chromatographed on silica-gel eluting with ethyl acetate/hexane (1:1) to give 3-(fluoro)phenethyl bromide (5.51 g, 100%), δ (250 MHz, CDCl3) 3.16 (2H, t, J=7.4 Hz, CH2), 3.57 (2H, t, J=7.4 Hz, CH2), 6.91-7.01 (3H, m, Ar--H), 7.24-7.33 (1H, m, Ar--H).

1. customwas removed in vacuo and diethyl ether (100 ml)
2. additionwas added to the residue
3. customThe resultant precipitate was removed by filtration
4. customthe filtrate evaporated under reduced pressure
5. customthe crude product chromatographed on silica-gel
6. washeluting with ethyl acetate/hexane (1:1)