A New Bisphosphonate Reagent for the Synthesis of (Z)-Olefins and Bis(trifluoroethyl) Phosphonates.

Abstract A new Wadsworth-Emmons reagent, tetrakis(2,2,2-trifluoroethyl) methylenediphosphonate, was prepared and its reaction with aldehydes to yield (Z) -vinyl phosphonates is described. Additionally, an example of a base catalyzed isomerization of a (Z) -vinyl phosphonate to the corresponding (E) -allylic phosphonate is also discussed.