The synthesis, nuclear magnetic resonance spectra, crystal structure and solid-state and solution conformations of tris(diphenylphosphino)ethene (tppee)

Article abstract of DOI:10.1016/0022-328X(88)80657-0

The synthesis of tris(diphenylphosphino)ethene (tppee) by addition of Ph2Ph to Ph2PCCPPh2, or by the reaction of Ph2PCl with Ph2PCLi:CHPPh2, and its crystal structure are described.Crystals of tppee are monoclinic, space group C2/c with a 3553.0(4), b 1044.1(1), c 1855.7(2) pm, β 93.40(1) deg, and Z=8; final R=0.0597 for 4585 observed reflections.The proton, 13C and 31P NMR parameters are reported, and the P-P and P-C coupling constants suggest a solution conformation that is close to that found by X-ray diffraction on the solid; that is, a close approach of the electron lone pairs of the cis-vicinal phosphorus atoms, and opposition of those on the geminal phosphorus atoms.