Reaktion #412241

Reaktionsgleichung

4-cyanobenzyl alcohol

sodium hydride

4-cyanobenzyl bromide

→

4,4′-(2-Oxa-propanediyl)-di-benzonitrile

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto warm to room temperature
2. 2
   Sonstige(bubbling was observed)
3. 3
   workup.ADDITIONTo the resulting light green mixture was added dry dimethylformamide (3 mL)
4. 4
   workup.STIRRINGAfter stirring for an additional hour
5. 5
   workup.STIRRINGThe resulting yellow, cloudy mixture was stirred at room temperature overnight
6. 6
   SonstigeThe reaction was then carefully quenched with the addition of 1 N aqueous HCl (15 mL)
7. 7
   Extraktionextracted with ether (3×30 mL)
8. 8
   WaschenThe combined ethereal extracts were washed with water and brine
9. 9
   Trocknenthen dried (MgSO4)
10. 10
    Filtrationfiltered
11. 11
    Einengenconcentrated in vacuo
12. 12
    Sonstigeto provide the desired ether as a light yellow solid (1.06 g, 89%)
13. 13
    SonstigeNo further purification

Vorschrift

To a cooled (0° C.), stirred solution of 4-cyanobenzyl alcohol (637 mg, 4.8 mmol) in dry THF (15 mL) was added a dispersion of sodium hydride in mineral oil (60%; 192 mg, 4.8 mmol), portionwise over five minutes under an argon atmosphere. The resulting milky white solution was allowed to warm to room temperature and stirred for three hours (bubbling was observed). To the resulting light green mixture was added dry dimethylformamide (3 mL) to improve homogeneity. After stirring for an additional hour, the 4-cyanobenzyl bromide (930 mg, 4.8 mmol) was added. The resulting yellow, cloudy mixture was stirred at room temperature overnight. The reaction was then carefully quenched with the addition of 1 N aqueous HCl (15 mL) and extracted with ether (3×30 mL). The combined ethereal extracts were washed with water and brine then dried (MgSO4), filtered and concentrated in vacuo to provide the desired ether as a light yellow solid (1.06 g, 89%). No further purification was necessary.

Quelle