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Synthesis of 4,4¡å-bis(diphenylamino)-[1,1¡ä:4¡ä,1¡å-terphenyl]-2¡ä,5¡ä-dicarbaldehyde (1). Under a nitrogen atmosphere, a mixture of (4-(diphenylamino)phenyl)boronic acid (1.74 g, 6mmol), 2,5-dibromoterephthalaldehyde (0.58 g, 2 mmol),Pd(PPh3)4(0.065 g, 0.06 mmol), Na2CO3(2.0 M, 3.0 mL), and toluene (50 mL)/THF (30 mL) was stirred at 90¡ãC for 24 h. After it was cooled to room temperature, 100 mL of CHCl3was added to the mixture. The organic portion was separated and washed with brine before drying over anhydrous MgSO4. The solvent was evaporated off, and the solid residues were purified by column chromatography to afford 0.87 g of 1 with a yield of 70.1%. 2-(3-Methoxyphenyl) acetonitrile (0.23 g, 1.55 mmol) and 1 (0.80 g, 1.29 mmol) were dissolved in anhydrous ethanol (20 mL) in the presence of sodium meth-oxide (0.80 g, 1.50 mmol). The mixture was stirred at room temperature for 6 hours. The resulting precipitate was filtered and washed with methyl alcohol several times to afford 0.94 g of DMCS-TPA with a yield of 82.9%. The procedure is similar to that described for the synthesis of DMCS-TPA. |
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