Phosphorus tribromide → 4-Fluorophenethyl bromide

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.

1. customrecooled to 0° C.
2. additionadded
3. extractionThe aqueous layer was extracted with ether (2×120 mL)
4. washthe combined organic extracts were then washed with saturated aqueous sodium bicarbonate solution (2×30 mL)
5. dry with materialdried (MgSO4)
6. concentrationconcentrated in vacuum
7. distillationDistillation

ORD-Eintrag

ord-78f2978710bb4377b00338b675d641f6

Quelldatensatz

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06713627B2