Reaktion #7291

Reaktionsgleichung

4-bromobenzaldehyde

4-bromobenzylbromide

triethylphosphite

sodium hydride

→

desired product

Ausbeute 65.0%

4,4′-dibromostilbene

Ausbeute 65.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeequipped with a stirrer
2. 2
   workup.ADDITIONThe temperature was dropped to room temperature
3. 3
   SonstigeAfter an ice bath was installed
4. 4
   workup.STIRRINGthe resultant was stirred for 30 minutes
5. 5
   Sonstigeice bath was removed
6. 6
   workup.STIRRINGthe reaction mixture was stirred at room temperature for 12 hours
7. 7
   workup.ADDITIONThe reaction mixture was poured into cold water
8. 8
   Sonstigeto give solid
9. 9
   FiltrationThis solid was filtered
10. 10
    Waschenthoroughly washed with water and methanol
11. 11
    Sonstigedried
12. 12
    Sonstigerecrystallized
13. 13
    Sonstigeto obtain white crystal, which
14. 14
    Sonstigewas sufficiently dried in a vacuum oven at 40° C.

Vorschrift

47 g (0.188 mol) of 4-bromobenzylbromide and 37.5 g (0.224 mol) of check triethylphosphite were put into a 500 ml 3-neck round-bottom flask equipped with a stirrer, a thermometer and a reflux condenser under an argon atmosphere, and the resulting mixture was stirred at 150° C. for 4 hours. The temperature was dropped to room temperature, and 250 ml of anhydrous DMF was added. After an ice bath was installed, 11.28 g (0.282 mol) of sodium hydride (60%) was slowly added and the resultant was stirred for 30 minutes. After 33.7 g (0.182 mol) of 4-bromobenzaldehyde was slowly added, ice bath was removed, and then the reaction mixture was stirred at room temperature for 12 hours. The reaction mixture was poured into cold water to give solid. This solid was filtered, thoroughly washed with water and methanol, dried and then recrystallized, to obtain white crystal, which was sufficiently dried in a vacuum oven at 40° C. to give 40 g (yield: 63%) of the desired product, and its melting point was 212° C.–213° C.

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