Publikation: Chiral zirconium complexes with bianiline-based N4-donor ligands
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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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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. 2004, 23(16), pp. 3800-3807. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om040011rBibTex
@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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