Réaction #9894

Équation de réaction

NBS

undec-10-en-1-ol

triphenylphosphine

→

11-bromo-undec-1-ene

Rendement 82.3%

Solvants

DMF

Conditions de réaction

Traitement

1. 1
   Autrethe reaction was quenched with methanol (0.5 mL)
2. 2
   workup.ADDITIONThe solution was diluted with ether (80 mL)
3. 3
   Lavagewashed with water, saturated aqueous NaHCO3 and brine successively
4. 4
   AutreThe organic layer was dried
5. 5
   Concentrationconcentrated
6. 6
   AutreThe residue was purified by flash chromatography on silica gel
7. 7
   Lavageeluting with hexane

Mode opératoire

To a solution of undec-10-en-1-ol (0.86 g, 5.0 mmol) in DMF (15 mL) was added triphenylphosphine (1.46 g, 5.6 mmol). The solution was cooled to 0° C. and NBS (0.96 g, 5.4 mmol) was added in portions. After stirring for 30 min at room temperature, the reaction was quenched with methanol (0.5 mL). The solution was diluted with ether (80 mL), washed with water, saturated aqueous NaHCO3 and brine successively. The organic layer was dried and concentrated. The residue was purified by flash chromatography on silica gel, eluting with hexane to afford 11-bromo-undec-1-ene (0.96 g, 82%) as a colorless oil: 1H NMR (300 MHz, CDCl3) δ 5.79 (1H, m), 4.93 (2H, m), 3.38 (2H, t, J=6.9 Hz), 2.02 (2H, m), 1.83 (2H, m), 1.20–1.55 (12H, m); 13C NMR (75 MHz, CDCl3) δ 139.36, 114.33, 34.27, 33.99, 33.01, 29.57×2, 29.27, 29.09, 28.94, 28.35.

Source