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Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts

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1997

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Sacchi, Maria Carmela
Barsties, Elke
Tritto, Incoronata
Locatelli, Paolo
Stehling, Udo

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http://nbn-resolving.de/urn:nbn:de:bsz:352-237543
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https://doi.org/10.1021/ma960720j
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Macromolecules. 1997, 30(14), pp. 3955-3957. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma960720j

Zusammenfassung

Propene has been polymerized with three different metallocene complexes:  Me2Si(Ind)2ZrCl2 (I), Me2Si(BenzInd)2ZrCl2 (II), and Me2Si(MeBenzInd)2ZrCl2 (III) by using 13C-enriched cocatalyst MAO/Al(13CH3)3. The stereochemical analysis of selectively 13C-enriched methyl chain end groups has shown that, while a moderate first step enantioselectivity is present with catalyst I, the bulky benzannelated substituents (catalysts II and III) lead to an almost total lack of steric control on the first monomer insertion. The methyl substitution in the 2-position of cyclopentadienyl ring (catalyst III) does not seem to influence the choice of the face.

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540 Chemie

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ISO 690SACCHI, Maria Carmela, Elke BARSTIES, Incoronata TRITTO, Paolo LOCATELLI, Hans-Herbert BRINTZINGER, Udo STEHLING, 1997. Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts. In: Macromolecules. 1997, 30(14), pp. 3955-3957. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma960720j
BibTex
@article{Sacchi1997Stere-23754,
  year={1997},
  doi={10.1021/ma960720j},
  title={Stereochemistry of first monomer insertion into metal-methyl bond : a tool for evaluating ligand-monomer interactions in propene polymerization with metallocene catalysts},
  number={14},
  volume={30},
  issn={0024-9297},
  journal={Macromolecules},
  pages={3955--3957},
  author={Sacchi, Maria Carmela and Barsties, Elke and Tritto, Incoronata and Locatelli, Paolo and Brintzinger, Hans-Herbert and Stehling, Udo}
}
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    <dcterms:abstract xml:lang="eng">Propene has been polymerized with three different metallocene complexes:  Me&lt;sub&gt;2&lt;/sub&gt;Si(Ind)&lt;sub&gt;2&lt;/sub&gt;ZrCl&lt;sub&gt;2&lt;/sub&gt; (I), Me&lt;sub&gt;2&lt;/sub&gt;Si(BenzInd)&lt;sub&gt;2&lt;/sub&gt;ZrCl&lt;sub&gt;2&lt;/sub&gt; (II), and Me&lt;sub&gt;2&lt;/sub&gt;Si(MeBenzInd)&lt;sub&gt;2&lt;/sub&gt;ZrCl&lt;sub&gt;2&lt;/sub&gt; (III) by using &lt;sup&gt;13&lt;/sup&gt;C-enriched cocatalyst MAO/Al(&lt;sup&gt;13&lt;/sup&gt;CH&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt;. The stereochemical analysis of selectively &lt;sup&gt;13&lt;/sup&gt;C-enriched methyl chain end groups has shown that, while a moderate first step enantioselectivity is present with catalyst I, the bulky benzannelated substituents (catalysts II and III) lead to an almost total lack of steric control on the first monomer insertion. The methyl substitution in the 2-position of cyclopentadienyl ring (catalyst III) does not seem to influence the choice of the face.</dcterms:abstract>
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