Reaction Steps
A 1.0 M hexane solution (34 ml) of diisobutylaluminum hydride (hereinafter, referred to as DIBAL) was added, dropwise, at −70° C., to a tetrahydrofuran solution (60 ml) of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl trifluoroacetate ester (18.3 g) obtained by reaction of trifluoroacetic anhydride and 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecanol, followed by stirring at −70 to −50° C. for 2 hours. The resultant reaction solution was allowed to warm gradually to 0° C., and 1-mol/L aqueous hydrochloric acid (5 ml) was added thereto, followed by stirring at the same temperature for 5 minutes. After extraction with ethyl acetate/1 mol/L-hydrochloric acid, the organic layer was washed with water and an aqueous sodium chloride solution, and then dried over magnesium sulfate. The solvent was concentrated under reduced pressure, to give crude 2,2,2-trifluoro-1-(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyloxy)ethanol. The resultant crude alcohol was dispersed in toluene (50 ml), and thionyl chloride (3.5 ml) and pyridine (4.0 ml) were added thereto, dropwise, at room temperature, followed by stirring for 3 hours. After the reaction solution was extracted with ethyl acetate/1 mol/L-aqueous hydrochloric acid, the organic layer was washed with water and an aqueous sodium chloride solution, dried over magnesium sulfate, and concentrated under reduced pressure. The concentrated residue was purified by column chromatography (developing solvent: ethyl acetate/hexane=1/9), to give 10-(1-chloro-2,2,2-trifluoroethoxy)-1,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8-heptadecafluorodecane (11.9 g, 63%).
