Reaktion #520921

Reaktionsgleichung

Tris(2-octyldodecyl)cyclopentadiene

n-butyl lithium

hexane

N2

3-Bromopropionitrile

→

yellow liquid

Ausbeute 102.0%

3-[tris(2-octyldodecyl)cyclopentadienyl]propionitrile

Ausbeute 102.0%

Lösungsmittel

dry ice acetone

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeequipped with an additional funnel, a gas inlet adapter
2. 2
   SonstigeThe dry ice/acetone bath was removed
3. 3
   Temperaturby cooling in dry ice/acetone bath
4. 4
   workup.ADDITIONAfter the addition
5. 5
   workup.STIRRINGthe reaction solution was stirred at room temperature for another 3 hours
6. 6
   SonstigeThe reaction was slowly quenched with 10 ml water
7. 7
   SonstigeThe organic layer was separated
8. 8
   Extraktionthe aqueous layer was extracted with 50 ml hexane
9. 9
   Trocknendried over MgSO4
10. 10
    Filtrationfiltered

Vorschrift

Tris(2-octyldodecyl)cyclopentadiene (18.12 grams, 20 mmol) was placed in a 3-necked round bottom flask equipped with an additional funnel, a gas inlet adapter, and a septum. After flashing with dried N2 for 2 minutes, 50 ml of dried THF (distilled over K) was added. The solution was cooled in dry ice/acetone bath, followed injected 8.4 M n-butyl lithium in hexane solution (2.40 ml; 20 mmol). The dry ice/acetone bath was removed, and the resulting dark red solution was stirred at room temperature for 1 hour, followed by cooling in dry ice/acetone bath. 3-Bromopropionitrile (2.70 grams, 20 mmol) in 10 ml dried THF solution was then dropwise added from the additional funnel. After the addition, the reaction solution was stirred at room temperature for another 3 hours. The reaction was slowly quenched with 10 ml water. The organic layer was separated, and the aqueous layer was extracted with 50 ml hexane. The organic layers were combined, dried over MgSO4, filtered, and rota-vaporized to give 19.6 grams of yellow liquid. The crude reaction product was purified by column chromatography on SiO2 eluting with 5% ethyl acetate/hexane. The unreacted tris(2-octyldodecyl)cyclopentadiene (3.66 grams) was recovered and the title compound (12.83 grams) was isolated. FTIR: 2248 cm−1 (C≡N); 13C NMR (4 isomers): 152.5-129.1 ppm (C═C), 120.8-119.6 ppm (4 peaks; C≡N), 59.5 ppm, 56.9 ppm, 51.3 ppm, 41.1 ppm, 39.5-26.4 ppm, 22.7 ppm, 14.1 ppm

Quelle