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2-Bromo-9,9-didodecylfluorene. To a mixture of 50% aqueous NaOH (12 mL), DMSO (40 mL) and 2-bromo fluorene (2.1 g, 8.2 mmol) was slowly added 1 bromododecane (4.9 mL, 19.6 mmol) at room temperature. The mixture was stirred at 90¡æovernight and then cooled to room temperature. After that, the mixture was added to brine and extracted with dichloromethane. The organic phase was dried over MgSO4 and the solvent was removed. The residue was purified with column chromatography (silica gel, petroleum ether) to give 3.55 g of yellow liquid (75% yield). 1H NMR (500 MHz, CDCl3): d 7.65 (d, 1H), 7.54 (d, 1H), 7.45 (d, 2H), 7.31 (s, 3H), 1.98 (t, 4H), 1.66 (qui, 4H), 1.53¨C1.15 (m, 36H), 0.88 ppm (t, 6H). 9,9-Didodecylfluorene-2-carbaldehyde. To a solution of 2- bromo-9,9-didodecyl fluorene (3.5 g, 6.03 mmol) in anhydrous THF (15 mL) was added dropwise n-BuLi (2.5 mL, 7.24 mmol) at 78 ¡æ. After stirring for 1 h, anhydrous DMF (2.87 g, 35.0 mmol) was added and stirred for an additional 12 h at 0 ¡æ. The resulting mixture was added to water and extracted with dichloromethane. The organic layer was separated and washed with diluted HCl and then saturated aqueous NaHCO3. The solvent was removed by evaporation and the residue was purified by column chromatography using dichloromethane/petroleum ether (1/10, v/v) as the eluent to give a colorless oil (1.43 g, 45% yield). 1H NMR (500 MHz, CDCl3): d 10.05 (s, 1H), 7.85¨C7.76 (m, 4H), 7.30 (s, 3H), 2.00 (t, 4H), 1.67 (qui, 4H), 1.25¨C1.12 (m, 36H), 0.87 ppm (t, 6H). |
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yhc0316: ½ð±Ò+50, ·ÒëEPI+1 2014-10-20 13:44:58
yhc0316: ½ð±Ò+50, ·ÒëEPI+1 2014-10-20 13:44:58
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