PENTACARBONYLMETALLDERIVATIVE VON PHOSPHINIDENEN UND DIPHOSPHENEN

Article abstract of DOI:10.1016/0022-328X(85)80182-0

Reaction of Na2 (M=Cr, Mo, W) with RPCl2 (R=mesityl, CH(SiMe3)2) yields, depending on the reaction conditions as well as on the steric demand of R, phosphinidene compounds <(CO)5M>2P-R and diphosphene species <(CO)5M>_nRP=PR (n=1, 2).With especially bulky substituents mono-nuclear diphosphene derivatives are the preferred reaction products.For dinuclear diphosphene compounds the Z-configuration is induced when R=mesityl while in other cases the E-configuration is the more stable form.The structures of the new compounds are documented by X-ray analyses of three examples.The accumulated material allows for a comparative discussion of the 31P NMR spectra, which often show unconventional low-field shifts (up to 1216 ppm), as well as of the characteristic UV/VIS spectra.For all compounds IR, 1H NMR and mass spectra as well as correct analyses are presented.