反应详情

温度

20 °C

The Grignard reagent prepared above, added dropwise to a suspension of 5.0 g (15.4 mmoles) of 5,5′-dibromo-2,2′-bithiophene and 0.084 g (0.154 mmoles) of Ni(dppp)2Cl2 in 50 mL dry ethyl ether. Typically, the Grignard is added from a feeding funnel under an inert gas (e.g., N2). The resulting mixture was heated to reflux for about 20 hours. The resulting mixture is cooled to about room temperature (e.g., to about 20° C.) and combined with about 200 mL of 5% aqueous NH4Cl to which some ice is added, to effect hydrolysis. The aqueous phase is extracted with about 2×100 mL of CH2Cl2. The organic phases combined are back washed with about 200 mL water and dried over MgSO4. The solvent is evaporated to give a raw product, 3,3′″-dihexyl-[2,2′;5′,2″;5″,2′″]quaterthiophene, which can be purified using, for example, a silica-gel column using hexanes 100% as eluant to give 6.4 g of material, (yield=83.4%). Proton NMR can be used to determine the presence of the raw product: 1HNMR: 7.25 ppm, (2H, d), 7.20 ppm, (2H, d), 7.10 ppm, (2H, d), 7.00 ppm, (2H, d), 2.83 ppm, (4H, t), 2.7 ppm, (4H, m), 1.41 ppm, (12H, m), 1.00 ppm, (6H, m).

1. temperatureThe resulting mixture was heated
2. temperatureto reflux for about 20 hours
3. additionis added
4. customhydrolysis
5. extractionThe aqueous phase is extracted with about 2×100 mL of CH2Cl2
6. washThe organic phases combined are back washed with about 200 mL water
7. dry with materialdried over MgSO4
8. customThe solvent is evaporated