Perfluorovinyl iodides reaction

Perfluorovinyl iodides readily undergo stereospecific coupling with the tn-fluoroinethylcopper solution [224] (equation 151) prepared from dibromodifluo-romethane [210] With longer-chain perfluoroalkylcopper reagents, the coupling reaction is accompanied by some exchange processes [225] (equation 152)... 

The reaction of these acetylenic copper compounds with perfluorovinyl iodides stereospecifically gives the perfluoroeneynes [147, 755] (equations 172 and 173). 

Tin.—Perfluoroisopropyltrimethyltin and the known perfluorovinyltri-methyltin have been prepared by photochemical reaction of hexamethylditin with perfluoroisopropyl iodide and perfluorovinyl iodide, respectively. These u.v.-induced reactions, like those reported previously between the ditin... 

Reductive coupling reaction of fluorinated vinyl iodides or bromides has been used as a route to fluorinated dienes [246, 247, 248, 249, 250]. Generally, the vinyl iodide is heated with copper metal in DMSO or DMF no i ntermediate perfluorovinyl-copper reagent is detected. Typical examples are shown in equations 163-165 [246, 247, 249], The X-ray crystal structure of perfluorotetracyclobutacyclooctatetraene, prepared via coupling of tetrafluoro-l,2-dnodocyclobutene with copper, is planar... 

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