Rare-Earth Metal Mixed Chloro/Methyl Compounds: Heterogeneous-Homogeneous Borderline Catalysts in 1,3-Diene Polymerization

On the right path: A chlorination–alkylation sequence involving the reaction of preformed mixed amido/chloro complexes (see structure) with trimethylaluminum causes precipitation of [{LnaAlbMecCld}n], which for Ln=Nd polymerizes isoprene in greater than 99 % cis stereospecificity (Mn/Mw=1.76); the c...

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Published inAngewandte Chemie (International ed.) Vol. 46; no. 34; pp. 6508 - 6513
Main Authors Meermann, Christian, Törnroos, Karl W, Nerdal, Willy, Anwander, Reiner
Format Journal Article
LanguageEnglish
Published Weinheim Wiley-VCH Verlag 2007
WILEY-VCH Verlag
WILEY‐VCH Verlag
Subjects
active species
lanthanides
neodymium
polymerization
Ziegler catalysts
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Summary:On the right path: A chlorination–alkylation sequence involving the reaction of preformed mixed amido/chloro complexes (see structure) with trimethylaluminum causes precipitation of [{LnaAlbMecCld}n], which for Ln=Nd polymerizes isoprene in greater than 99 % cis stereospecificity (Mn/Mw=1.76); the catalyst performance is comparable to that observed following a “detour” alkylation–chlorination sequence employing [Nd(AlMe4)3]/Et2AlCl.
Bibliography:http://dx.doi.org/10.1002/anie.200604829
ark:/67375/WNG-4ZVXZX0D-5
ArticleID:ANIE200604829
Nanoscience@UiB
Norwegian Research Council - No. 171245/V30
istex:24C118FEEA4EE15A5BB25299B171FDDA8C2F7BBA
Financial support from the Norwegian Research Council (Project No. 171245/V30) and the program Nanoscience@UiB is gratefully acknowledged. We also thank Till Diesing (c/o Dr. Markus Klapper, MPI für Polymerforschung, Mainz (Germany)) for GPC analyses and Melanie Zimmermann for recording NMR spectra.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.200604829