Siloxy Titanocene and Zirconocene Complexes Derived from the Ferriomethyl-Silanol Cp(OC)2Fe−CH2−SiMe2OH: Synthesis and Structure of Cp(OC)2Fe−CH2−SiMe2O−M(Cl)Cp2(M = Ti, Zr) and [Cp(OC)2Fe−CH2−SiMe2O]2−ZrCp2

The Et3N-assisted condensation of the ferriomethyl-silanol Cp(OC)2Fe−CH2−SiMe2OH (1) with 1 equiv of Cp2MCl2 (M = Ti (2a), Zr (2b)) leads to the formation of the iron fragment substituted heterosiloxanes Cp(OC)2Fe−CH2−SiMe2O−M(Cl)Cp2 (M = Ti (3a), Zr (3b)). The bis(siloxy) zirconium complex [Cp(OC)2Fe−CH2−SiMe2O]2−ZrCp2 (4) is obtained by further condensation of the M−Cl functionality of 3b with 1. The new compounds have been identified spectroscopically, and in addition, 3b and 4 have been structurally characterized by single-crystal X-ray diffraction methods.