反应详情

Lithium wire (3.33 g, 0.08 mol) was washed with pentane, carefully cut into small pieces, and suspended in 150 mL of Et2O. While stirring, 2,2-dibromobiphenyl (25 g, 0.08 mol) in 100 mL of diethyl ether was added dropwise over 1 hour and the contents were allowed to stir for 10 hours. The mixture was filtered through a frit to remove any unreacted Li and LiBr. The filtrate was loaded into an addition funnel and slowly dropped into a solution containing SiCl4 (50 g, 0.08 mol) in 200 mL of Et2O. After addition, the contents were stirred at room temperature for 5 hours. The solvent was removed in vacuo and 300 mL of pentane was added. The solution was filtered to remove LiCl and the solvents were again removed in vacuo. The solids were then loaded into a sublimator and allowed to sublime at 150° C. under full vacuum. Yield was 10.0 g (51%).

1. stirringto stir for 10 hours
2. filtrationThe mixture was filtered through a frit
3. customto remove any unreacted Li and LiBr
4. customThe filtrate was loaded into an addition funnel
5. additionslowly dropped into a solution
6. additionAfter addition
7. stirringthe contents were stirred at room temperature for 5 hours
8. customThe solvent was removed in vacuo and 300 mL of pentane
9. additionwas added
10. filtrationThe solution was filtered
11. customto remove LiCl
12. customthe solvents were again removed in vacuo
13. customto sublime at 150° C. under full vacuum