Under an argon gas atmosphere, 49.0 g (106.1 mmol) of 5-{[(trifluoromethyl) sulfonyl]oxy}naphthyl trifluoromethanesulfonate, 28.5 g (233.3 mmol) of phenylboronic acid, 4.90 g (4.24 mmol) of tetrakis(triphenylphosphine)palladium(0), 200 ml of toluene, 100 ml of dimethoxyethane and 320 ml of 2M sodium carbonate solution were mixed, and stirred for 24 hours at 90 degrees C. After the reaction in the mixture was over, the mixture experienced filtration, through which aqueous phase thereof was eliminated. After organic phase thereof was cleansed by water and dried with magnesium sulfate, the solvent was distilled away under reduced pressure. Residue thereof was refined by silica-gel column chromatography, such that 18.0 g of 1.5-diphenylnaphthalene was obtained with an yield of 60%.
