Methylamine → HCID 11391445, compound

45 g of methylamine are condensed at a bath temperature of −78° C. into a solution of 30.6 g of 3-iodopropyl-4,4,5,5,5-pentafluoropentyl sulphide in 200 ml of abs. tetrahydrofuran and the mixture is stirred at room temperature for 1.5 hours and at 60° C. for 4 hours in a pressure reactor. To open the reactor, it is allowed to cool overnight to room temperature and then to −78° C. It is then allowed to come to room temperature, excess methylamine is evaporated, the mixture is diluted with ethyl acetate, washed until neutral, dried over sodium sulphate and concentrated in vacuo, and the residue is chromatographed on silica gel using dichloromethane/methanol. 15.7 g of N-methyl-[3-(4,4,5,5,5-pentafluoro-pentylthio)propyl]amine are obtained as an oil.