Reaction of ethynylsilanes with perfluoroiodoalkanes

The addition of iodotrifluoromethane, 1-iodoperfluoropropane, and 1-iodo-1,1,2,2,3,3,4,4-octafluorobutane to alkylethynyl- and alkylalkoxyethynylsilanes gave the 1-iodo-3,3,3-trifluoropropen-1-ylsilanes, 1-iodo-3,3,3,4,5-5,5-heptafluoropenten-1-ylsilanes, and 1-iodo-3,3,4,4,5,5,6,6-octafluorohexen-1-ylsilane. The corresponding fluorosilanes were synthesized by reacting the latter with 40% aqueous HF solution.