Reaktion #79556

Reaktionsgleichung

2-(4-fluorophenyl)ethyl alcohol

phosphorous tribromide

→

2-(4-fluorophenyl)ethyl bromide

Ausbeute 64.8%

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigerecooled to 0° C.
2. 2
   workup.ADDITIONadded
3. 3
   ExtraktionThe aqueous layer was extracted with ether (2×120 mL)
4. 4
   Waschenthe combined organic extracts were then washed with saturated aqueous sodium bicarbonate solution (2×30 mL)
5. 5
   Trocknendried (MgSO4)
6. 6
   Einengenconcentrated in vacuum
7. 7
   workup.DISTILLATIONDistillation

Vorschrift

To a solution of 2-(4-fluorophenyl)ethyl alcohol (13.4 mL, 107 mmol) in dry toluene (150 mL) at 0° C. was added phosphorous tribromide (21.1 mL, 224 mmol). The resulting mixture was stirred at ambient temperature for 5 days and then recooled to 0° C. and crushed ice (200 g) added. The aqueous layer was extracted with ether (2×120 mL) and the combined organic extracts were then washed with saturated aqueous sodium bicarbonate solution (2×30 mL), dried (MgSO4) and concentrated in vacuum. Distillation afforded 2-(4-fluorophenyl)ethyl bromide as a colorless oil (14.08 g, 31%); b.p. 103° C. @12 mm Hg.

Quelle