@article{Yu2010Zirco-9962,
  year={2010},
  doi={10.1039/b916289e},
  title={Zirconium enolatoimine complexes in olefin polymerization},
  number={19},
  volume={39},
  issn={1477-9226},
  journal={Dalton Transactions},
  pages={4612--4618},
  author={Yu, Sze-Man and Tritschler, Ulrich and Göttker-Schnetmann, Inigo and Mecking, Stefan}
}

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    <dc:contributor>Göttker-Schnetmann, Inigo</dc:contributor>
    <dcterms:bibliographicCitation>First publ. in: Dalton Transactions 39 (2010), 19, pp. 4612-4618</dcterms:bibliographicCitation>
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    <dc:contributor>Mecking, Stefan</dc:contributor>
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    <dc:creator>Mecking, Stefan</dc:creator>
    <dc:contributor>Yu, Sze-Man</dc:contributor>
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    <dcterms:title>Zirconium enolatoimine complexes in olefin polymerization</dcterms:title>
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    <dc:creator>Yu, Sze-Man</dc:creator>
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    <dc:creator>Göttker-Schnetmann, Inigo</dc:creator>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T18:15:36Z</dc:date>
    <dc:creator>Tritschler, Ulrich</dc:creator>
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    <dcterms:abstract xml:lang="eng">Zirconium complexes with enolatoimine ligands bearing an electron-withdrawing trifluoromethyl group on the alkoxy moiety [k2-N,O-{2,6-R2N=C(CH3)C(H)=C(O)CF3]2ZrCl2 (2a, R = H; 2b, R = F; 2c, R = CH3; 2d, R = iPr) were prepared. The isopropyl substituents hinder rotation in solution for 2d, and result in a trans-arrangement of the N-donors in the solid state. Catalyst activities are similar for 2a/MAO and 2b/MAO in ethylene polymerization (1.8 x 10 5 TO h-1 for 2a and 3.3 x 10 5 TO h-1 for 2b at 25 °C under 1 bar monomer pressure), increasingly bulky alkyl substituents result in strongly decreased polymerization activities (7.1 x 10 2 TO h-1 for 2c and 5.7 x 10 2 TO h-1 for 2d at 25 °C). This goes along with an increase in polymer molecular weight (Mw = 8.1 x 103, Mw/Mn = 2.9 for 2a, Mw = 3.8 x 105, Mw/Mn = 2.0 for 2b, Mw = 1.0 x 106, Mw/Mn = 2.8 for 2c), apparently bulky substituents retard chain transfer even more strongly than activation of the precursors and/or chain growth. 2b/MAO affords atactic polypropylene (Mw = 1.4 x 10 4 g mol-1,Mw/Mn = 2.1) with a small portion of regioirregular structures. The reaction of [Zr(CH2Ph)4] with the ketoenamine 2,6-F2C6H3N(H)-CMe=CHC(O)CF3 (1b) yielded the dibenzyl complex [(o-F2C6H3N=CMeCH=C(CF3)O)2Zr-(CH2Ph)2] (3b) which was investigated as a catalyst precursor for ethylene homopolymerization in combination with different activators.</dcterms:abstract>
    <dc:contributor>Tritschler, Ulrich</dc:contributor>
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