Methylenephosphanyl Comple:r.es of Chromium., Molybdenum, Tungsten, Iron and Nickel -Syntbesis and ReacUvity "The reacHon of the functionalized Pie double bond systems x -P", qR)SiMe l [R = SiMel and X = Cl (la), Cp· (5a) or R -Pb and X = Br (1 b), Cp· (S b)1 wilh alkali carbonylmetallates or earbonyl eomplexes of group 6, 8. and 10 metals leads to thc formation of the transition metal-substituted phosphaalkenes J{M}-P= C(R)SiMeJ 3a -j and 4a -i J, in which the P-C fragment aets as a one-eleetron donor. Depending on the nuc1eophilicity of the tnm~ition m .. t ..

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1993organo-tungsten compounds organo-tungsten compounds S 5700 -247Methylenephosphanyl Complexes of Chromium, Molybdenum, Tungsten, Iron and Nickel -Synthesis and Reactivity.-The title complexes are prepared by the two methodologies used for the synthesis of complexes (III) and (VI). The phosphorus atom of the title complexes shows high nucleophilicity demonstrated by the reactions of (VI) with the compounds (VII), (IX), and chalcogenes.-(NIECKE, E.; METTERNICH, H.-J.; NIEGER, M.; GUDAT, D.; WENDEROTH, P.; MALISCH, W.; HAHNER, C.; REICH, W.; Chem.