Group 4 metallocene complexes with non-bridged and tetramethyldisiloxane-bridged methyl-phenyl-cyclopentadienyl ligands: synthesis, characterization and olefin polymerization studies
Identifiers
Permanent link (URI): http://hdl.handle.net/10017/4179DOI: 10.1016/j.jorganchem.2004.06.059
ISSN: 0022-328X
Publisher
Elsevier
Date
2004Funders
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.2004.06.059Rights
© Elsevier, 2004
Access rights
info:eu-repo/semantics/openAccess
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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