In a 50 ml-three-necked flask, 0.20 g (1.11 mM) of 2-oxooctylamine hydrochloride, 0.46 g (1.33 mM) of 6-decyloxy-2-naphthoyl chloride and 5 ml of dioxane were placed. To the mixture, 1.6 ml of pyridine was added at about 85° C. under heat-stirring, followed by heat-stirring for 30 minutes at 92°-94° C. After the reaction, the reaction mixture was poured into water to precipitate a crystal. The crystal was recovered by filtration and washed with water, followed by recrystallization from a mixture solvent of acetonemethanol to provide 0.41 g of 2-oxooctyl-(6-decyloxy-2-naphthoyl)amine (Yield: 81.2%).
