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Chiral zirconium complexes with bianiline-based N4-donor ligands

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2004

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Kettunen, Mika
Vedder, Christoph
Schaper, Frank
Leskelä, Markku
Mutikainen, Ilpo
Brintzinger, Hans-Herbert

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Organometallics. 2004, 23(16), pp. 3800-3807. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om040011r

Zusammenfassung

Syntheses of new tetradentate ligands, containing a bianiline backbone and two additional heterocyclic N-donors, and of chiral zirconium complexes containing these ligands as dianions are reported. Crystal structures of some of these complexes show a preference for coordinating the two remaining ligands in a trans- rather than cis-orientation. Nevertheless, these complexes are moderately active in MAO-activated olefin polymerization in toluene solution at 50 °C. With propene, partly isotactic polypropene (55% mmmm) is obtained. These observations indicate that in cationic species generated in these reaction systems, the growing polymer chain and the olefin substrate occupy cis-coordination sites, while the heterocyclic N ligands adopt a screw-like trans orientation suitable to favor one of the enantiofacial orientations of the entering olefin substrate.

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540 Chemie

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ISO 690KETTUNEN, Mika, Christoph VEDDER, Frank SCHAPER, Markku LESKELÄ, Ilpo MUTIKAINEN, Hans-Herbert BRINTZINGER, 2004. Chiral zirconium complexes with bianiline-based N4-donor ligands. In: Organometallics. 2004, 23(16), pp. 3800-3807. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om040011r
BibTex
@article{Kettunen2004Chira-23724,
  year={2004},
  doi={10.1021/om040011r},
  title={Chiral zirconium complexes with bianiline-based N<sub>4</sub>-donor ligands},
  number={16},
  volume={23},
  issn={0276-7333},
  journal={Organometallics},
  pages={3800--3807},
  author={Kettunen, Mika and Vedder, Christoph and Schaper, Frank and Leskelä, Markku and Mutikainen, Ilpo and Brintzinger, Hans-Herbert}
}
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