Abstract Palladium-catalyzed cross-coupling reaction of α-phosphonovinyl nonafluorobutanesulfonates (nonaflates) 1 with dialkyl phosphites gave versatile intermediate reagents, gem-bis (phosphono) ethylenes 2a-d in 35-93% yields. The reaction of bis (diethylphosphono) ethylene (2a) with tribromomethyllithium to give the Michael adduct 3 was followed by treatment with potassium hydride to form 1, 1-dibromo-2, 2-bis ( ...
