Chiral zirconium complexes with bianiline-based N4-donor ligands


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KETTUNEN, Mika, Christoph VEDDER, Frank SCHAPER, Markku LESKELÄ, Ilpo MUTIKAINEN, Hans-Herbert BRINTZINGER, 2004. Chiral zirconium complexes with bianiline-based N4-donor ligands. In: Organometallics. 23(16), pp. 3800-3807. ISSN 0276-7333. eISSN 1520-6041

@article{Kettunen2004Chira-23724, title={Chiral zirconium complexes with bianiline-based N4-donor ligands}, year={2004}, doi={10.1021/om040011r}, 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} }

Leskelä, Markku deposit-license eng Mutikainen, Ilpo Kettunen, Mika 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. 2013-06-20T15:01:26Z Brintzinger, Hans-Herbert 2013-06-20T15:01:26Z Schaper, Frank Leskelä, Markku Mutikainen, Ilpo Chiral zirconium complexes with bianiline-based N<sub>4</sub>-donor ligands Vedder, Christoph Vedder, Christoph Organometallics ; 23 (2004), 16. - S. 3800-3807 2004 Brintzinger, Hans-Herbert Schaper, Frank Kettunen, Mika

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