Rare earth metal-based catalysts for the polymerization of nonpolar and polar monomers

The synthesis of rare earth metal half-sandwich hydrido complexes [Ln (h :h -C Me SiMe NCMe ) (THF) (µ-H) ] (Ln = Y, Lu) through s-bond metathesis of the easily accessible alkyl complexes [Ln (h :h -C Me SiMe NCMe ) (CH SiMe ) (THF) ] was developed. The dimeric yttrium hydrido complexes are highly f...

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Bibliographic Details
Published in:Pure and applied chemistry 2001-01, Vol.73 (2), p.351-354
Main Authors: Okuda, Jun, Arndt, Stefan, Beckerle, Klaus, Hultzsch, Kai C., Voth, Peter, Spaniol, Thomas P.
Format: Article
Language:English
Subjects:
Alkenes
Atacticity
Catalysis
Catalysts
Coordination compounds
Dimers
Ethylene
Insertion
Metathesis
Monomers
Polymerization
Rare earth elements
Styrenes
Yttrium
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Summary:The synthesis of rare earth metal half-sandwich hydrido complexes [Ln (h :h -C Me SiMe NCMe ) (THF) (µ-H) ] (Ln = Y, Lu) through s-bond metathesis of the easily accessible alkyl complexes [Ln (h :h -C Me SiMe NCMe ) (CH SiMe ) (THF) ] was developed. The dimeric yttrium hydrido complexes are highly fluxional, and a monomer-dimer equilibrium is present. They were tested as single-site, single-component catalysts for the polymerization of ethylene and styrene, as well as alkyl acrylate and acrylonitrile. The hydrido complexes polymerize ethylene slowly and form isolable mono (insertion) products with styrene. The yttrium n-alkyl complexes [Y (h :h -C Me SiMe NCMe ) (R) (THF) ] [R = (CH ) CH , n = 3-9], prepared by the mono (insertion) of a-olefins, initiate polymerization in a relatively controlled manner. Thus, styrene was polymerized by the n-alkyl complex to give atactic polystyrenes with somewhat enriched syndiotacticities.
ISSN:0033-4545
1365-3075
DOI:10.1351/pac200173020351