Synthesis and reactivity of silicon transition metal complexes, 45 - Metallo-silanoles and metallo-siloxanes, 18 - A catalytic pathway for the conversion of tungsten-silanes into tungsten-silanols

摘要

Tungsten substituted silanes C5H5(OC)(2)(Ph3P)W-SiMe2H (3a), C5Me5(OC)(2)(Me3P)W-SiMe2H (3b) and C5Me5(OC)(2)(Me3P)W-SiH3 (6) are converted with urea hydrogenperoxide in the presence of catalytic amounts of MeReO3 to the corresponding metallo-silanols C5H5(OC)(2)(Ph3P)W-SiMe2OH (4a), C5Me5(OC)(2)(Me3P)W-SiMe2OH (4b) and C5Me5(OC)(2)(Me3P)W-Si(OH)(3) (7). Condensation of 4b with R3SiCl yields the tungsten-substituted disiloxanes C5Me5(OC)(2)(Me3P)W-SiMe2OSiR3 (SiR3 = SiMe2H (5a), SiCl3 (5b)). (C) 1998 Elsevier Science S.A. All rights reserved. [References: 13]