Pentafluoro-λ6-sulfanyl (SF5) perfluoroalkyl iodides-synthesis and reaction with ethylene and tetrafluoroethylene: Crystal structure of SF5(CF2)4CH2CH2I

A series of reactions between SF5CF2CF2I and SF5(CF2)4I with F2CCF2 was carried out in an effort to find the most effective methods for chain-extension. Also, for the first time, SF5(CF2)8I and SF5(CF2)10I have been prepared and isolated. The reaction conditions for the addition of H2CCH2 were also investigated. A determination of the crystal structure of the SF5(CF2)4CH2CH2I has been carried out: the crystal system is monoclinic, with space group P2(1)/n and a=23.465(5) Å; b=6.0971(12) Å; c=44.892(9) Å; α=90°; β=99.38(3)°; γ=90°; Z=20.