To 4,4-dihydroxybenzophenone (196 mg, 915 μmol) were added DMF (20 ml), 1-(12-bromododecyloxy)docosane (1.1 g, 1.91 mmol) and potassium carbonate (379 mg, 2.74 mmol), and the mixture was stirred at 90° C. overnight. The reaction mixture was cooled to room temperature, and 0.5N hydrochloric acid (20 ml) and chloroform (20 ml) were added. After stirring for a while, the aqueous layer was removed, and the organic layer was washed with water (10 ml)×2. The organic layer was evaporated under reduced pressure, and the residue was washed with methanol. The precipitate was collected by filtration to give 4,4-di(12-docosoxydodecyloxy)benzophenone (1.04 g, 867 μmol, 95%).
