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ansa-metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge : syntheses, crystal structures and properties in propene polymerization catalysis

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Barsties_239179.pdf
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1996

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Barsties, Elke
Schaible, Stefan
Prosenc, Marc-Heinrich
Rief, Ursula
Weyand, Oliver
Dorer, Birgit

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Journal of Organometallic Chemistry. 1996, 520(1-2), pp. 63-68. ISSN 0022-328X. Available under: doi: 10.1016/0022-328X(96)06263-8

Zusammenfassung

Bis(2-N,N-dimethylamino-indenyl) zirconium dichloride, (2-(CH3)2N-C9H6)2ZrCl2, and dimethylsilyl-bridged bis(2-N,N-dimethylamino-indenyl) zirconium dichloride, (CH3)2Si(2-(CH3)2N-C9H5)2ZrCl2, were prepared by reaction of the corresponding ligand lithium salts with ZrCl4 in toluene. Diffractometric structure determinations reveal C2-symmetric complex geometries for both complexes. An increased electron density at the Zr center of the dimethylamino-substituted complexes is indicated by reduction potentials which are 0.3–0.4 V more negative than those of their unsubstituted analogs. When activated with methyl aluminoxane in toluene solution, (CH3)2Si(2-(CH3)2N-C9H5)2ZrCl2 catalyzes the polymerization of propene to polymers with a microstructure comparable with that of polymers produced with other Me2Si-bridged bis(indenyl)ZrCl2 complexes, but with a substantially increased fraction of i-propyl end groups derived from alkyl exchange between Zr-polymer and AlMe species.

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540 Chemie

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Zirconium, ansa-zirconecenes, 2N, N-dimethylamino-indenyl ligand

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ISO 690BARSTIES, Elke, Stefan SCHAIBLE, Marc-Heinrich PROSENC, Ursula RIEF, Werner RÖLL, Oliver WEYAND, Birgit DORER, Hans-Herbert BRINTZINGER, 1996. ansa-metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge : syntheses, crystal structures and properties in propene polymerization catalysis. In: Journal of Organometallic Chemistry. 1996, 520(1-2), pp. 63-68. ISSN 0022-328X. Available under: doi: 10.1016/0022-328X(96)06263-8
BibTex
@article{Barsties1996ansam-23917,
  year={1996},
  doi={10.1016/0022-328X(96)06263-8},
  title={ansa-metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge : syntheses, crystal structures and properties in propene polymerization catalysis},
  number={1-2},
  volume={520},
  issn={0022-328X},
  journal={Journal of Organometallic Chemistry},
  pages={63--68},
  author={Barsties, Elke and Schaible, Stefan and Prosenc, Marc-Heinrich and Rief, Ursula and Röll, Werner and Weyand, Oliver and Dorer, Birgit and Brintzinger, Hans-Herbert}
}
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