Réaction #7293

Équation de réaction

1,4-dibromo-2,5-dimethoxybenzene

trimethylsilylacetylene

→

desired product

Rendement 73.8%

1,4-bis(trimethylsilylethynyl)-2,5-dimethoxybenzene

Rendement 73.8%

Solvants

diisopropylamine

Conditions de réaction

Traitement

1. 1
   Autreequipped with a stirrer
2. 2
   Températurethe reaction mixture was cooled down to room temperature
3. 3
   Filtrationwas filtered off
4. 4
   Autrethe solvent was removed under a reduced pressure
5. 5
   workup.DISSOLUTIONThe residue was dissolved in chloroform
6. 6
   Lavageresultant was washed with water several times
7. 7
   Séchagedried with anhydrous magnesium sulfate, which
8. 8
   Filtrationwas then filtered off
9. 9
   AutreThe solvent was removed
10. 10
    Autrethe residue was recrystallized from ethyl acetate/hexane mixture
11. 11
    Autreto obtain pale yellow crystal, which
12. 12
    Autrewas sufficiently dried in a vacuum oven at 40° C.

Mode opératoire

100 g (0.338 mol) of 1,4-dibromo-2,5-dimethoxybenzene, 7.12 g (0.01 mol) of bistriphenylphospine palladium dichloride and 1.93 g (0.01 mol) of copper iodide were put into a 1 litter 3-neck round-bottom flask equipped with a stirrer, a thermometer and a reflux condenser under an argon atmosphere, and dissolved in 600 ml of diisopropylamine. 99 g (1 mol) of trimethylsilylacetylene was then slowly added dropwise at room temperature, and stirred at 80° C. for 12 hours. When the reaction was completed, the reaction mixture was cooled down to room temperature, generated salt was filtered off, and then the solvent was removed under a reduced pressure. The residue was dissolved in chloroform, and resultant was washed with water several times and then dried with anhydrous magnesium sulfate, which was then filtered off. The solvent was removed, and the residue was recrystallized from ethyl acetate/hexane mixture to obtain pale yellow crystal, which was sufficiently dried in a vacuum oven at 40° C. to give 82.5 g (yield: 73%) of the desired product, and its melting point was 164° C.–165° C.

Source