Synthese und Reaktivität von Silicium-Übergangsmetallkomplexen, XIV [1] Umsetzung von Cp(CO)2Fe-substituierten Silieium-Wasserstoff-Verbindungen mit DicobaJtoctacarbonyl: Synthese von Siliciumverbindungen mit zwei, drei und vier Übergangsmetall -Liganden / Synthesis and Reactivity of Silicon Transition Metal Complexes, XIV [1] Reaction of Cp(CO)2Fe-Substituted Silanes with Dicobaltoctacarbonyl: Synthesis of Silicon Compounds with Two, Three and Four Transition Metal Ligands

Abstract

The reaction of Cp(CO)2Fe-SiHCl2 with Co2(CO)8 yields the heteronuclear complex Cp(CO)2Fe-SiCl2-Co(CO)4 (1) and HCo(CO)4.1 is degradated by AgBF4 to Cp(CO)2Fe-SiF3. PMe3 transforms 1 to Cp(CO)2Fe-SiCl2-Co(CO)3PMe3 (2). LnM-SiH2Me reacts with Co2(CO)8 to give LnM-SiMe-Co2(CO)7 [LnM = Cp(CO)2Fe (3a), Cp(CO)2PMe3W (3b)]. Starting with Cp(CO)2Fe-SiH3, μ3-Cp(CO)2Fe-SiCo3(CO)9 (4), the second example of a μ3-metallosilylidine tricobalt cluster is obtained in high yield, which is cleaved by acetic acid to Cp(C0)2Fe-Si[OC(O)Me]3 (5). The composition and structure of the silicon transition metal complexes 1-5 is proved by NMR, IR and mass spectroscopy. 29Si NMR shifts are determined for the first time for a tri- and tetra-metalated silicon species