Reaktion #2439928

Reaktionsgleichung

4-bromo-4′-ethylbiphenyl

3-fluorophenyl dihydroxyborane

potassium carbonate

toluene

→

residue

Ausbeute 145.4%

4″-ethyl-3-fluoro-[1,1′; 4′,1″]terphenyl

Ausbeute 145.4%

Lösungsmittel

water

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas refluxed for 6 hours
2. 2
   Sonstigeto obtain a reaction solution
3. 3
   SonstigeAfter removing the catalyst
4. 4
   Filtrationby filtration, 50 mL of toluene
5. 5
   workup.ADDITIONwas added to the reaction solution, which
6. 6
   Waschenwas then washed with water
7. 7
   WaschenThe reaction solution having been washed with water
8. 8
   Trocknenwas dried over anhydrous magnesium sulfate
9. 9
   workup.DISTILLATIONthe solvent was distilled off from the reaction solution under reduced pressure

Vorschrift

A mixture of 5.6 g (21.4 mmol) of 4-bromo-4′-ethylbiphenyl, 3.6 g (25.7 mmol) of 3-fluorophenyl dihydroxyborane, 4.4 g (32.2 mmol) of potassium carbonate, 0.3 g of 5%-Pd/C and 60 mL of a mixed solvent of toluene, ethanol and water (ratio: 1/1/1) was refluxed for 6 hours to obtain a reaction solution. After removing the catalyst by filtration, 50 mL of toluene was added to the reaction solution, which was then washed with water. The reaction solution having been washed with water was dried over anhydrous magnesium sulfate, and the solvent was distilled off from the reaction solution under reduced pressure to obtain 8.6 g of a residue. The residue was purified by silica gel column chromatography (eluent: heptane/toluene=4/1) to obtain 5.1 g of crude crystals of the compound (E-8). The crude crystals were dissolved in a mixed solvent of ethanol and ethyl acetate (ratio: 10/1) and recrystallized therefrom to obtain 4.5 g of purified crystals of the compound (E-8).

Quelle