Abstract
The synthesis of tris(diphenylphosphino)ethene (tppee) by addition of Ph 2PH to Ph 2PCCPPh 2, or by the reaction of Ph 2PCl with Ph 2PCli:CHPPh 2, and its crystal structure are described. Crystals of tppee are monoclinic, space group C2/ c with a 3553.0(4), b1044.1(1), c 1855.7(2) pm, β 93.40(1)°, and Z = 8; final R = 0.0597 for 4585 observed reflections. The proton, 13C and 31P NMR parameters are reported, and the PP and PC 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.
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