Group 4 metallocene complexes with non-bridged and tetramethyldisiloxane-bridged methyl-phenyl-cyclopentadienyl ligands: synthesis, characterization and olefin polymerization studies
Identificadores
Enlace permanente (URI): http://hdl.handle.net/10017/4179DOI: 10.1016/j.jorganchem.2004.06.059
ISSN: 0022-328X
Editor
Elsevier
Fecha de publicación
2004Patrocinadores
Ministerio de Educación, Cultura y Deporte
Repsol-YPF
Cita bibliográfica
Journal of Organometallic Chemistry, 2004, v.689, n.24, p.4395-4406
Palabras clave
Cyclopentadienyl
Zirconium
Hafnium
Disiloxane
ansa-Metallocenes
Olefin-Polymerization
Proyectos
MAT2001-1309 (Ministerio de Ciencia y Tecnología)
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Versión del editor
http://dx.doi.org/10.1016/j.jorganchem.2004.06.059Derechos
© Elsevier, 2004
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
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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