IC[CH2:3][CH2:4][CH:5]([S:15][CH:16](CCCI)[CH2:17][CH2:18][C:19]([F:25])([F:24])[C:20]([F:23])([F:22])[F:21])CCC(F)(F)C(F)(F)F.[CH3:30][NH2:31]>O1CCCC1>[CH3:30][NH:31][CH2:3][CH2:4][CH2:5][S:15][CH2:16][CH2:17][CH2:18][C:19]([F:25])([F:24])[C:20]([F:23])([F:22])[F:21]In a solution of 30.6 g of 3-iodopropyl-4,4,5,5,5-pentafluoropentylsulfide in 200 ml of absolute tetrahydrofuran, 45 g of methylamine is condensed at a bath temperature of ±78° C., and it is stirred for 1.5 hours at room temperature and for 4 hours at 60° C. in the pressurized reactor. To open the reactor, it is allowed to cool overnight to room temperature and then to −78° C. Then, it is allowed to reach room temperature, excess methylamine is evaporated, diluted with ethyl acetate, washed neutral, dried on sodium sulfate, concentrated by evaporation in a vacuum and chromatographed on silica gel with dichloromethane/methanol. 15.7 g of N-methyl-[3-(4,4,5,5,5-pentafluoropentylthio)-propyl]-amine is obtained as an oil.
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