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Stereospecific Polymerization of Isoprene with Molecular and MCM‐48‐Grafted Lanthanide( III ) Tetraalkylaluminates
Author(s) -
Fischbach Andreas,
Klimpel Michael G.,
Widenmeyer Markus,
Herdtweck Eberhardt,
Scherer Wolfgang,
Anwander Reiner
Publication year - 2004
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200352730
Subject(s) - isoprene , lanthanide , stereospecificity , polymerization , component (thermodynamics) , chemistry , polymer , polymer chemistry , copolymer , catalysis , organic chemistry , thermodynamics , physics , ion
Hard graft : Heterobimetallic peralkylated complexes [Ln{(μ‐R) 2 (AlR 2 )} 3 ] (R=Me, Et) can be exploited to study metal‐size effects in “Ziegler Mischkatalysatoren”. Binary precatalyst system [Nd(AlMe 3 ) 4 ]/Et 2 AlCl and heterogenized single‐component variants, such as [Nd(AlMe 3 ) 4 ]@Et 2 AlCl@MCM‐48 (see picture) efficiently transform isoprene to a high‐ cis polymer (>99 %).