Phosphorus tribromide → 1-(3-Bromopropyl)-4-methoxybenzene
Reaktionsgleichung
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9][CH2:10][CH2:11]O)=[CH:5][CH:4]=1.P(Br)(Br)[Br:14]>>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9][CH2:10][CH2:11][Br:14])=[CH:5][CH:4]=1Komponenten
3
Versuchsvorschrift
To a solution of 3-(p-methoxyphenyl)-1-propanol (16.6 g; 0.1 mol) in 250 mL of tolune, cooled to 0° C., was added dropwise 26 mL of phosphorus tribromide (0.27 mol). Following completion of the addition the reaction was stirred at room temperature for 1 hour, then refluxed for an additional hour. The reaction was cooled and poured onto ice, the layers were separated, and the organic phase washed with saturated sodium bicarbonate (3×) and brine (3×). The crude material obtained upon drying and evaporation of the solvent was chromatographed, eluting with 10%, EtOAc/hexane, to obtain 14 g (61%) of 3-(p-methoxyphenyl)-1-propylbromide.
Aufarbeitung
- additioncompletion of the addition the reaction