Reaktion #9894

Reaktionsgleichung

NBS

undec-10-en-1-ol

triphenylphosphine

→

11-bromo-undec-1-ene

Ausbeute 82.3%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

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

Vorschrift

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.

Quelle