In a stream of argon, 185 mg (0.644 mmol) of 9,9-dimethyl-2-benzo[c]fluoreneboronic acid, 300 mg (0.644 mmol) of 2-(3,5-dibromophenyl)-4,6-diphenyl-1,3,5-triazine and 7.44 mg (0.00644 mmol) of tetrakis(triphenylphosphine)palladium were suspended in a mixed solvent composed of 24 mL of toluene and 3 mL of ethanol, and the resultant suspension was heated to 50° C. To the suspension, 1.93 ml (1.93 mmol) of an aqueous 1M K2CO3 solution was gradually added dropwise, and the mixture was stirred for 3 hours. The resultant reaction mixture was heated to 80° C. and further stirred for 3 hours. The reaction mixture was cooled to room temperature, and then, 256 mg (1.29 mmol) of 4-(2-pyridyl)phenylboronic acid and 2.90 mL (2.90 mmol) of an aqueous 1M K2CO3 solution were added to the reaction mixture. The resultant mixture was heated to 80° C., and maintained at that temperature for 24 hours while being stirred. The obtained reaction mixture was cooled to room temperature, and then distilled under a reduced pressure to remove all volatile materials. Methanol was added to the concentrate, and the thus-deposited solid was collected by filtration. The obtained crude product was purified by silica gel chromatography using a hexane/chloroform (1:2) mixed solvent as an eluent to give 172 mg of the target 2-[5-(9,9-dimethylbenzo[c]fluoren-2-yl)-4′-(2-pyridyl)biphenyl-3-yl]-4,6-diphenyl-1,3,5-triazine as a white solid (yield: 38.0%).
