(Fluorenyl)titanium Triisopropoxide and Bis(fluorenyl)titanium Diisopropoxide: A Facile Synthesis, Molecular Structure, and Catalytic Activity in Styrene Polymerization

[(η1-Flu)Ti(μ-OiPr)(OiPr)2]2 (1) and (η1-Flu)(η5-Flu)Ti(OiPr)2 (2) were easily prepared from FluLi and ClTi(iPrO)3 and demonstrated a remarkable thermal stability in comparison with known (fluorenyl)titanium complexes. Both complexes were characterized by X-ray analysis and temperature-dependent NMR spectroscopy. In combination with methylaluminoxane, both compounds are highly efficient initiators for styrene polymerization, producing highly syndiotactic polymers.