تفاعل #75455

معادلة التفاعل

4-bromobiphenyl

iodine

hexabromobenzene

4-Bromobiphenyl

→

1,2,4,5-tetra-p-biphenylylbenzene

المذيبات

THF

THF

THF

ظروف التفاعل

المعالجة

1. 1
   أخرىequipped with a condenser, a nitrogen inlet, an additional funnel and a magnetic stirring bar
2. 2
   أخرىplaced in an additional funnel
3. 3
   أخرىwas placed in a 50° C.
4. 4
   workup.ADDITIONwas added dropwise to the reaction
5. 5
   workup.ADDITIONAfter addition
6. 6
   أخرىthe brownish reaction
7. 7
   درجة الحرارةwas heated
8. 8
   درجة الحرارةat reflux for another hour
9. 9
   workup.ADDITIONwas added dropwise from an additional funnel to the reaction
10. 10
    أخرىThe reaction was quenched with ice and 8% hydrochloric acid
11. 11
    استخلاصextracted with 400 mL of methylene chloride
12. 12
    غسيلThe organic layer was washed with saturated sodium chloride solution
13. 13
    تجفيفdried over magnesium sulfate
14. 14
    أخرىSolvent was evaporated
15. 15
    غسيلthe crude product was washed with hexane
16. 16
    ترشيحfiltered
17. 17
    أخرىto give pure product

الإجراء التجريبي

Dry Mg turnings (3.9 g, 0.16 mol) and 30 mL of anhydrous THF were added to a 1 L 3-necked round-bottomed flask equipped with a condenser, a nitrogen inlet, an additional funnel and a magnetic stirring bar. 4-Bromobiphenyl (37.2 g, 0.16 mol) was dissolved in 150 mL of THF and placed in an additional funnel. The reaction flask was placed in a 50° C. oil bath and one crystal of iodine was added. Once the reaction started 4-bromobiphenyl was added dropwise to the reaction. After addition, the brownish reaction was heated at reflux for another hour and then cooled to room temperature. A suspension of hexabromobenzene (11.0 g, 0.02 mol) in 150 mL of THF was added dropwise from an additional funnel to the reaction and the mixture was stirred at room temperature overnight. The reaction was quenched with ice and 8% hydrochloric acid and extracted with 400 mL of methylene chloride. The organic layer was washed with saturated sodium chloride solution and dried over magnesium sulfate. Solvent was evaporated and the crude product was washed with hexane and filtered to give pure product.

المصدر