Abstract
4-Bromo- and 4-chloroheptafluoro-1,2-epoxybutanes were synthesized and successfully copolymerized with hexafluoropropene oxide derived acid fluorides. Transformation of the bromine-containing acid fluorides to hydrogen terminated compounds was accompanied by substitution of bromine by hydrogen; this interference was absent in the copolymers of 4-chloroheptafluoro-1,2-epoxybutane. Ultraviolet irradiation in the presence of mercury was found effective in coupling the bromo-substituted perfluoroalkylether nitrile, C 3F 7OCF(CF 3)CF 2OCF(CF 2CF 2Br)CN, without any side reactions.
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