Abstract: Structures have been assigned to the thermal cycloadducts of vinylidene fluoride to butadiene and, except for cis-trans isomerism, to those of trifluoroethylene to isoprene, 2, 3- dimethylbutadiene, and cis-and trans-l, 3-pentadiene. In the latter, the preferred orientation is that with the less fluorinated carbon atom adjacent to the unsaturated group in the cyclobutane. Trifluorovinyl chloride yields l-alkenyl-2-chloro-2, 3, 3-trifluorocyclobutanes ...
