4,5-Bis(4-methoxyphenyl)-2-(pyrrol-2-yl)thiazole obtained in the same manner as described in Reference Example 6 (1.81 g, 5 mmole), 2,2,2-trifluoroethyl p-toluenesulfonate (1.27 g, 5 mmole), and tetra-n-butylammonium bromide (0.16 g, 0.5 mmole) are refluxed in two phases of benzene (20 ml) and 50% aqueous sodium hydroxide (20 ml) for 16 hours. To the mixture are added water and benzene under ice-cooling, and the mixture is shaken. The benzene layer is taken, and the aqueous layer is further extracted with benzene. The benzene layers are combined, dried over anhydrous magnesium sulfate, and distilled under reduced pressure to give an oily residue. The oily residue is subjected to silica gel column chromatography (solvent: benzene) and then is recrystallized from n-hexane to give 4,5-bis(4-methoxyphenyl)-2-[1-(2,2,2-trifluoroethyl)pyrrol-2-yl]thiazole (0.80 g, yield: 36%).
