Synthesis of telogens and optimization of tetrafluoroethene telomerization process

The most advantageous technological parameters of tetrafluoroethene telomerization using 1-chloro-2-iodohexafluoropropane (telogen) towards the telomers n2–n4 or n1–n4 were experimentally established. The telomers n1–n4 were prepared with the yield of 48 mol% under the following conditions: temperature 170 °C, the molar ratio of 1-chloro-2-iodohexafluoropropane to tetrafluoroethene equal to 1.2, the autoclave filling of 1.5 kg dm−3. The maximum yield of telomers n2–n4 amounted to 27 mol% when the molar ratio of telogen to tetrafluoroethene was decreased to 0.7 and the other parameters of synthesis remained the same. The optimum parameters for the synthesis of telogens: 1-chloro-2-iodohexafluoropropane and 2-iodoheptafluoropropane have been also determined.