Synthesis and characterization of methyl-phenyl-substituted cyclopentadienyl zirconium complexes

Authors
Martínez Martínez, GemaUniversity of Alcalá Author; Royo Gracia, PascualUniversity of Alcalá Author; Herdtweck, Eberhardt
Identifiers
Permanent link (URI): http://hdl.handle.net/10017/4178
DOI: 10.1016/j.jorganchem.2004.10.044
ISSN: 0022-328X
Publisher
Elsevier
Date
2005
Affiliation
Universidad de Alcalá. Departamento de Química Inorgánica
Funders
Ministerio de Educación, Cultura y Deporte
Bibliographic citation
Journal of Organometallic Chemistry, 2005, v.690, n.4, p.952-961
Keywords
Cyclopentadienyl
Metallocene
Silyl-amido
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.2004.10.044
Rights
© Elsevier, 2004
Access rights
info:eu-repo/semantics/openAccess
Share
 
Abstract
The trisubstituted methyl-phenyl-silyl-cyclopentadienes [Me-Ph-C5H3(SiMe2X)] (X = Me, Cl, NHt-Bu) and [(Me-Ph-C5H3)2SiMe2] and the lithium salts Li2[Me-Ph-C5H2(SiMe2Nt-Bu)] and Li2[(Me-Ph-C5H2)2SiMe2] have been isolated by conventional methods and characterized by NMR spectroscopy. Desilylation of [Me-Ph-C5H3(SiMe3)] with ZrCl4(SMe2)2 gave the monocyclopentadienyl complex [Zr(η5-1-Ph-3-Me-C5H3)Cl3]. The ansa-metallocene [Zr{(η5-2-Me-4-Ph-C5H2)SiMe2(η5-2-Ph-4-Me-C5H2)}Cl2] was obtained from the mixture of isomers formed by transmetallation of Li2[(Me-Ph-C5H2)2SiMe2] to ZrCl4 and characterized as the meso-diastereomer by X-ray diffraction methods. Similar transmetallation of Li2[Me-Ph-C5H2(SiMe2Nt-Bu)] gave the silyl-η-amido complex [Zr{η5-2-Me-4-Ph-C5H2(SiMe2-η-Nt-Bu)}Cl2] that was further alkylated to give [Zr{η5-2-Me-4-Ph-C5H2(SiMe2-η-Nt-Bu)}R2] (R = Me, CH2Ph) and used as a catalyst precursor, activated with MAO, for ethene and propene polymerization. All of the new compounds were characterized by elemental analysis and NMR spectroscopy.
Files in this item
Collections