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Homogeneous Ethylene‐Polymerization Catalysts Based on Alkyl Cations of the Rare‐Earth Metals: Are Dicationic Mono(alkyl) Complexes the Active Species?
Author(s) -
Arndt Stefan,
Spaniol Thomas P.,
Okuda Jun
Publication year - 2003
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.200352532
Subject(s) - alkyl , polymerization , chemistry , ethylene , dication , yttrium , catalysis , polymer chemistry , homogeneous , organic chemistry , molecule , polymer , oxide , physics , thermodynamics
Easily accessible , the tris(alkyl) complexes of rare‐earth elements [Ln(CH 2 SiMe 3 ) 3 (thf) 2 ] are activated by [NMe 2 HPh][B(C 6 F 5 ) 4 ] in the presence of Al i Bu 3 to catalyze homogeneous ethylene polymerization. Model reactions show that the bis(alkyl) yttrium monocation is converted into the mono(alkyl) dication (see picture), which appears to be the active species in ethylene polymerization.