λ3σ3P and λ5σ5P derivatives of (E)-1,2-difluoro-2-(pentafluoro-λ6-sulfanyl)ethylene and (Z)-1,2,3,3,3-pentafluoropropylene

For the first time, the (E)-1,2-difluoro-2-(pentafluoro-λ⁶-sulfanyl)ethenyl group has been bonded to λ³σ³ phosphorus using a Grignard reagent. Similar phosphorus derivatives containing the (Z)-1,2,3,3,3-pentafluoropropenyl moiety were also synthesized for comparison. In three cases, hexafluoroacetone was added to form 4,4,5,5-tetrakis(trifluoromethyl) 1,3,2λ⁵σ⁵-dioxaphospholanes. © 1997 John Wiley & Sons, Inc. Heteroatom Chem 8: 467–471, 1997