Titanium Hydrocarbyl Complexes with a Linked Cyclopentadienyl−Alkoxide Ancillary Ligand; Participation of the Ligand in an Unusual Activation of a (Trimethylsilyl)methyl Group

The titanium complexes [η 5:η 1 -C 5 Me 4 (CH 2 ) 3 O]TiR 2 (R = Cl, Me, CH 2 Ph, CH 2 CMe 3, CH 2 SiMe 3 ), with a linked Cp−alkoxide ancillary ligand, have been prepared in good yield. Cationic [C 5 Me 4 (CH 2 ) 3 O]Ti(η 2 -CH 2 Ph) + catalyzes the polymerization of propene to atactic polypropene. B(C 6 F 5 ) 3 reacts with [C 5 Me 4 (CH 2 ) 3 O]Ti(CH 2 SiMe 3 ) 2 by Me abstraction from one of the CH 2 SiMe 3 groups accompanied by an attack of the ligand alkoxide functionality on the Si atom of this group.