Abstract: Tris (trifluoroethy1) phosphite, bis (trifluoroethy1) phenylphosphonite, trifluoroethyl diphenylphosphinite, and triphenylphosphine all react with 2 mol of trifluoroethyl benzenesulfenate to give pentacoordinated phosphorus compounds in which two trifluoroethoxy groups have been added to the original tricoordinated phosphorus compound. When tris (trifluoroethy1) phosphite was allowed to react with 1 mol of ...