Materials. The olefins 1 and 2 were prepared by vapor-phase pyrolysis (530-540" C) of the acetates of the alcohols obtained by radical-catalyzed addition of ethanol or isoyopyl alcohol to tetrafluoroethylene. They boiled at 27 and 52-53" C, nZ5D 1.3028 and 1.3243, respectively. Olefins 3 and 4 were prepared by" dry distillation" of the sodium carboxylates RFCF2CF2COONa, according to Hals et al.* They boiled respectively at 71-72 and 62-74 ...