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Group 4 metallocene complexes with non-bridged and tetramethyldisiloxane-bridged methyl-phenyl-cyclopentadienyl ligands: synthesis, characterization and olefin polymerization studies

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Authors
Martínez Martínez, GemaUniversity of Alcalá Author; Royo Gracia, PascualUniversity of Alcalá Author; González Mosquera, Marta ElenaUniversity of Alcalá Author
Identifiers
Permanent link (URI): http://hdl.handle.net/10017/4179
DOI: 10.1016/j.jorganchem.2004.06.059
ISSN: 0022-328X
Publisher
Elsevier
Date
2004
Affiliation
Universidad de Alcalá. Departamento de Química Inorgánica
Funders
Ministerio de Educación, Cultura y Deporte
Repsol-YPF
Bibliographic citation
Journal of Organometallic Chemistry, 2004, v.689, n.24, p.4395-4406
Keywords
Cyclopentadienyl
Zirconium
Hafnium
Disiloxane
ansa-Metallocenes
Olefin-Polymerization
Project
MAT2001-1309 (Ministerio de Ciencia y Tecnología)
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
http://dx.doi.org/10.1016/j.jorganchem.2004.06.059
Rights
© Elsevier, 2004
Access rights
info:eu-repo/semantics/openAccess
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Abstract
The non-vicinal methyl-phenyl-substituted zirconocene dichlorides meso-and rac-[Zr{η5-(1-Ph-3-Me-C5H3)}2Cl2] and [Zr(η5-C5H5){η5-(1-Ph-3-Me-C5H3)}Cl2] have been isolated by transmetallation of the lithium salt Li(1-Ph-3-Me-C5H3) to ZrCl4(THF)2 and [Zr(η5-C5H5)Cl3 · DME] (DME = dimethoxyethane), respectively. Similar transmetallation of the lithium salt Li2[(Me-Ph-C5H2SiMe2)2O] to MCl4 gave the ansa-metallocenes [M{η5-(Me-Ph-C5H2SiMe2)2O}Cl2] (M = Zr, Hf) for which the meso- and rac-diastereomers were separated. The dimethyl and dibenzyl derivatives of these metallocenes were also prepared and the structure of all of these compounds determined by NMR spectroscopy. The molecular structure of rac-[Zr{η5-(2-Me-4-Ph-C5H2SiMe2)2O}Cl2] was determined by single crystal X-ray diffraction methods. The activity of the dichlorometallocenes/MAO catalysts for ethene and propene polymerization was evaluated.
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