Reaktion #64024

Reaktionsgleichung

NaCl

sodium

methyldichlorosilane

Hexane

THF

Methyldichlorosilane

→

cloudy white oil

Ausbeute 81.0%

Hexane THF

Ausbeute 81.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeIn a dry box, a 1 liter three-necked, round-bottomed flask equipped with a stir-bar, a dropping funnel and a reflux condenser
2. 2
   SonstigeThe flask was attached to a Schlenk
3. 3
   Sonstigemanifold, evacuated
4. 4
   Sonstigeflushed with nitrogen
5. 5
   workup.ADDITIONTHF (70 ml) and hexane (420 ml) were added
6. 6
   workup.ADDITIONThe reaction solution turned purple and by the end of the addition
7. 7
   Temperaturheated
8. 8
   Temperaturat reflux for 16 hours
9. 9
   TemperaturAfter it had been cooled to room temperature
10. 10
    Sonstigethe clear, colorless supernatant layer transferred by cannula into a 1 liter round-bottomed flask
11. 11
    Sonstigeequipped with a stir-bar
12. 12
    Sonstigepreviously separated
13. 13
    SonstigeSolvent was removed by trap-to-trap
14. 14
    workup.DISTILLATIONdistillation until the volume of the residue
15. 15
    Sonstigethe remaining liquid was transferred by cannula into a weighed 250 ml round-bottomed flask
16. 16
    SonstigeRemaining solvent was removed by trap-to-trap
17. 17
    workup.DISTILLATIONdistillation at approximately 0.05 mm Hg at room temperature

Vorschrift

In a dry box, a 1 liter three-necked, round-bottomed flask equipped with a stir-bar, a dropping funnel and a reflux condenser was charged with 75.0 g (3.26 mol) of sodium metal. The flask was attached to a Schlenk manifold, evacuated and flushed with nitrogen. THF (70 ml) and hexane (420 ml) were added and the dropping funnel was charged with 150 ml (1.44 mol) of methyldichlorosilane. Methyldichlorosilane was added slowly into the flask over a 3 hour period. The reaction solution turned purple and by the end of the addition was at gentle reflux. The reaction mixture was stirred at room temperature for 2 hours and then heated at reflux for 16 hours. After it had been cooled to room temperature, the reaction mixture (except for the large NaCl crystals) was transferred via cannula into a heavy-walled glass bottle. The mixture was centrifuged and the clear, colorless supernatant layer transferred by cannula into a 1 liter round-bottomed flask equipped with a stir-bar. Hexane (200 ml) and THF (20 ml) were added to the remaining solids, the mixture again was centrifuged, and the supernatant liquid combined with the supernatant solution previously separated. Solvent was removed by trap-to-trap distillation until the volume of the residue was about 100 ml, and the remaining liquid was transferred by cannula into a weighed 250 ml round-bottomed flask. Remaining solvent was removed by trap-to-trap distillation at approximately 0.05 mm Hg at room temperature to give 51.2 g (81%, 1.16 mol) of a cloudy white oil.

Quelle