Reaktion #2045078

Reaktionsgleichung

dibenzo[b,d]thiophen-4-yl lithium

m-bromophenyl lithium

n-butyllithium

hexane

1,3-dibromobenzene

m-bromophenyl lithium

dichlorodiphenylsilane

→

(3-bromophenyl)(dibenzo[b,d]thiophen-4-yl)diphenylsilane

Ausbeute 31.0%

Lösungsmittel

ether

ether

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe resultant reaction solution
2. 2
   Sonstigeprepared
3. 3
   workup.ADDITIONabove was introduced dropwise
4. 4
   SonstigeIt was quenched with water
5. 5
   Extraktionextracted with ether
6. 6
   Trocknendried over Na2SO4
7. 7
   SonstigeUpon evaporation of the solvent
8. 8
   Sonstigethe residue was purified by column chromatography on silica gel with hexane/DCM (9/1

Vorschrift

In another flask was prepared a solution of m-bromophenyl lithium by addition of n-butyllithium solution in hexane (2.5 M, 9.48 mL, 23.70 mmol) into a solution of 1,3-dibromobenzene (2.56 mL, 21.20 mmol) in ether (70 mL) at −78° C. followed by stirring at this temperature for 3.5 h. This m-bromophenyl lithium solution was added dropwise into a solution of dichlorodiphenylsilane (4.88 mL, 23.70 mmol) in ether (70 mL) at −78° C. The resultant reaction solution was stirred at this temperature for 2 h before the dibenzo[b,d]thiophen-4-yl lithium solution prepared above was introduced dropwise. The resultant solution was allowed to slowly warm to room temperature overnight. It was quenched with water, extracted with ether and dried over Na2SO4. Upon evaporation of the solvent, the residue was purified by column chromatography on silica gel with hexane/DCM (9/1, v/v) as eluent to yield (3-bromophenyl)(dibenzo[b,d]thiophen-4-yl)diphenylsilane as a white powder (3.84 g, 31%).

Quelle