@article{Babushkin2007Modif-23668,
  year={2007},
  doi={10.1002/chem.200601801},
  title={Modification of methylaluminoxane-activated ansa-zirconocene catalysts with triisobutylaluminum-transformations of reactive cations studied by NMR spectroscopy},
  number={18},
  volume={13},
  issn={0947-6539},
  journal={Chemistry - A European Journal},
  pages={5294--5299},
  author={Babushkin, Dmitrii E. and Brintzinger, Hans-Herbert}
}

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    <dcterms:abstract xml:lang="eng">When triisobutylaluminum (AliBu&lt;sub&gt;3&lt;/sub&gt;) is added to solutions containing methylaluminoxane (MAO) and rac-[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;] (ind: indenyl) in C&lt;sub&gt;6&lt;/sub&gt;D&lt;sub&gt;6&lt;/sub&gt;, NMR spectra show that methyl-bridged mixed-alkylaluminum dimers Al(μ-Me)&lt;sub&gt;2&lt;/sub&gt;Me&lt;sub&gt;4&lt;/sub&gt;−xiBux predominate. These dimers react with MAO under partial transfer of isobutyl groups and induce a conversion of the initially prevailing cationic trimethylaluminum adduct rac-[Me&lt;sub&gt;2&lt;/sub&gt;Si(ind)&lt;sub&gt;2&lt;/sub&gt;Zr(μ-Me)&lt;sub&gt;2&lt;/sub&gt;AlMe&lt;sub&gt;2&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt;] to rac-[Me&lt;sub&gt;2&lt;/sub&gt;Si(ind)&lt;sub&gt;2&lt;/sub&gt;Zr(μ-Me)&lt;sub&gt;2&lt;/sub&gt;AlMeiBu&lt;sup&gt;+&lt;/sup&gt;] and rac-[Me&lt;sub&gt;2&lt;/sub&gt;Si(ind)&lt;sub&gt;2&lt;/sub&gt;Zr(μ-Me)&lt;sub&gt;2&lt;/sub&gt;AliBu&lt;sub&gt;2&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt;]. These species are unstable and release isobutene under formation of zirconocene hydrides.</dcterms:abstract>
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    <dcterms:bibliographicCitation>Chemistry : A European Journal ; 13 (2007), 18. - S. 5294-5299</dcterms:bibliographicCitation>
    <dcterms:issued>2007</dcterms:issued>
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    <dc:contributor>Babushkin, Dmitrii E.</dc:contributor>
    <dcterms:title>Modification of methylaluminoxane-activated ansa-zirconocene catalysts with triisobutylaluminum-transformations of reactive cations studied by NMR spectroscopy</dcterms:title>
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