Journal of Organometallic Chemistry p. 225 - 236 (1996)
Update date:2022-08-16
Topics:
Mansel, Stefan
Rief, Ursula
Prosenc, Marc-Heinrich
Kirsten, Robin
Brintzinger, Hans-Herbert
Chiral ansa-zirconocene complexes with a trimethylene link between the Si bridge atom and an α-position of each C5 ring ligand were prepared; two representatives, with i-propyl and t-butyl groups as β-substituents, were structurally characterized. The properties of these complexes with respect to MAO-activated propene polymerization were studied in comparison with those of their Me2Si-bridged analogs. The t-butyl-substituted spirosilane complex gives a polymer with relatively high content of 3,1-insertions. These increased regioirregularities appear to be associated with decreased coordination gap aperture and increased lateral extension angles of the spirosilane-bridged zirconocene complexes; this notion is supported by a molecular-mechanics analysis of alternative olefin-insertion transition states.
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