The Stereospecific Substitution of the Xenon Atom in cis‐Perfluoroalk‐1‐enylxenon(II) Salts by Hydrogen,Halogens, and the Phenyl Group

The substitution of the xenon atom in reactions of cis‐C_nF_2n+1CF=CFXe]Y] salts with benzene, iodide, and bromide anions in propionitrile solution by the phenyl group, or iodine, and bromine atoms, respectively, occurred stereospecifically. When a propionitrile solution of cis‐C₂F₅CF=CFXe]AsF₆] was kept at —40 °C without an additional reactant, the fluoroalkene cis‐C₂F₅CF=CFH was the only isomer obtained.