thesized initially3 for model studies of the crosslinking mechanism of fluoro elastomer^.^ Subsequent investigations required either a chlorine or a fluorine substituent in place of iodine. Treatment of I with two moles of chlorine at low temperatures resulted in an 83% yield of 4-hydroperfluoroheptene-3 (11). The procedure was a convenient one for dehydrohalogenation. Substitution of the iodine by fluorine was accomplished by heating I ...
