Stable Borate-Bridged ansa-Zirconocene Complexes. Preparation and X-ray Crystallographic Characterization of [Cp*2Al]+[Me(Ph)B(η5-C5H4)2ZrCl2]- and [PPN]+[Cl(Ph)B(η5-C5H4)2ZrCl2]-
摘要:
The title complexes are stable, borate-bridged ansa-zirconocene species which have been prepared by reacting [{Ph(SMe2)B(eta(5)-C5H4)(2)}ZrCl2] (1) with Cp*(2)-AlMe and [PPN]Cl. Their molecular structures were determined by X-ray diffraction. Noteworthy are the stabilities of the borate-cyclopentadienyl linkages and the enhanced Lewis acidity of the boron within its strained ansa position.