In an amount of 30.0 g (49 mmol) of 1,4-di(3,3,4,4,5,5,6,6,6-nonafluorohexyl) maleate, 6.8 mL (54 mmol) of N,N-dimethylaminopropylamine and 7.5 g (54 mmol) of potassium carbonate were dissolved in 120 mL of acetonitrile and refluxed for 6 hours with heating. Then, the reaction mixture was transferred to a separatory funnel and added with 1000 mL of ethyl acetate. The organic phase was washed with a saturated aqueous sodium hydrogencarbonate solution. Then, the organic layer was collected, and the organic solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:methanol=100:3 (volume ratio)) to obtain 2.64 g (yield: 75%) of the target compound as a brown oily compound.
