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The tungstenmethyl-dimethylsilanols Cp(OC) 2 (R 3 P)W-CH 2 -SiMe 2 OH [R = Me (6a), Ph (6b)] have been synthesized by oxofunctionalization of the tungstenmethyl-silanes Cp(OC) 2 (R 3 P)W- CH 2 -SiMe 2 H [R = Me (3a), Ph (3b)] with dimethyldioxirane. 6a has been additionally obtained by Et 3 N-assisted hydrolysis of the tungstenmethyl-chlorosilane Cp(OC) 2 (Me 3 P)W-CH 2 - SiMe 2 Cl (5). Compounds 6a,b are stable with respect to self-condensation, but controlled condensation of 6a with Me 2 Si(H)Cl in the presence of triethylamine has been realized to give the tungstenmethyl-substituted disiloxane Cp(OC) 2 (Me 3 P)W-CH 2 -SiMe 2 O-SiMe 2 H (7). The new compounds have been identified IR- and NMR-spectroscopically and, in the case of 3a, by X-ray analysis.

Tungstenmethyl-Dimethylsilanols Cp(Oc) 2 (R 3 P)W—CH 2 —SiMe 2 OH (R = Me, Ph) – Synthesis Via Oxygenation or Hydrolysis