Synthesis and Reactivity of Silicon Transition Metal Complexes, 34. Pentachlordisilanyl‐ und Disilanyl‐Komplexe von Molybdän und Wolfram: Darstellung, Struktur und spektroskopische Charakterisierung

Abstract

Synthesis and Reactivity of Silicon Transition Metal Complexes, 34 [*] . — Pentachlorodisilanyl and Disilanyl Complexes of Molybdenum and Tungsten: Synthesis, Structure, and Spectroscopic Characterization Reaction of the lithium metallates Li[M(PMe 3 )(CO) 2 C 5 R 5 ] [M = Mo, W; R = H ( 1a, b ), Me ( 1c, d )] with Si 2 Cl 6 ( 2 ) leads to the formation of the pentachloro(metallo)disilanes 5 R 5 (OC) 2 (Me 3 P)M—SiCl 2 —SiCl 3 ( 3a—d ), which are transformed into the metallo disilanes C 5 R 5 (OC) 2 (Me 3 P)M—SiH 2 —SiH 3 ( 4a—d ) on treatment with LiAlH 4 . The disilanes 4a—d are reconverted into 3a—d in the presence of tetrachloromethane. Extensive spectroscopic investigations (NMR, Raman, and IR spectroscopy) were performed to establish the transition‐metal effect especially with respect to the H 5 Si 2 ligand. The molecular structure of C 5 Me 5 (OC) 2 (Me 3 P)W—SiCl 2 —SiCl 3 ( 3d ) was determined by single‐crystal X‐ray diffraction.