Reaktion #573508

Reaktionsgleichung

magnesium

diethyl ether

diethyl ether

4-bromotriphenylamine

diethyl ether

diethyl ether

bis(chloromethyl)diethylsilane

→

desired product

Ausbeute 78.0%

bis(4-diphenylaminophenylmethyl)diethylsilane

Ausbeute 78.0%

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeequipped with a mechanical stirrer, a condenser, a nitrogen-inlet tube and a dropping funnel
2. 2
   workup.ADDITIONWhen about 5 ml was added
3. 3
   Temperaturmild reflux
4. 4
   workup.ADDITIONAfter completion of the addition
5. 5
   Temperaturreflux
6. 6
   SonstigeThe Grignard solution thus obtained
7. 7
   workup.ADDITIONAfter completion of the addition
8. 8
   workup.STIRRINGthe reaction mixture was stirred under reflux conditions for 8 hours
9. 9
   TemperaturThen, the mixture was cooled on ice water bath
10. 10
    ExtraktionThe ether layer was extracted
11. 11
    Waschenwashed with a saturated aqueous solution of sodium hydrogen carbonate
12. 12
    Trocknenby drying with anhydrous sodium sulfate
13. 13
    SonstigeAfter drying
14. 14
    workup.DISTILLATIONthe diethyl ether was distilled off
15. 15
    Sonstigeto yield a white solid, which
16. 16
    Sonstigewas then recrystallized with n-hexane/toluene (3/1)

Vorschrift

0.6 g (24.9 mmol) of metallic magnesium was placed in a 200-ml four-necked flask equipped with a mechanical stirrer, a condenser, a nitrogen-inlet tube and a dropping funnel, and the inside atmosphere was replaced with nitrogen. 100 ml of diethyl ether was added and stirring was initiated. To this solution, 20 ml of a diethyl ether solution of 3.7 g (20 mmol) of bis(chloromethyl)diethylsilane was gradually added dropwise. When about 5 ml was added, mild reflux began. Under reflux conditions, the remainder of the diethyl ether solution was added. After completion of the addition, reflux was continued for 1 more hour. The Grignard solution thus obtained was cooled to room temperature, and then 6 mg of NiCl2 (dppe) was added at room temperature. Further 20 ml of a diethyl ether solution of 13.0 g (40 mmol) of 4-bromotriphenylamine was gradually added dropwise under ice cooling. After completion of the addition, the reaction mixture was stirred under reflux conditions for 8 hours. Then, the mixture was cooled on ice water bath, and 50 ml of water was added for hydrolysis. The ether layer was extracted and washed with a saturated aqueous solution of sodium hydrogen carbonate and then with two portions of water, followed by drying with anhydrous sodium sulfate. After drying, the diethyl ether was distilled off to yield a white solid, which was then recrystallized with n-hexane/toluene (3/1) to yield 19.7 g of the desired product (yield 78%).

Quelle