DC Field | Value | Language |
---|---|---|
dc.contributor.author | Zachmanoglou, CE | ko |
dc.contributor.author | Melnick, JG | ko |
dc.contributor.author | Bridgewater, BM | ko |
dc.contributor.author | Churchill, David G | ko |
dc.contributor.author | Parkin, G | ko |
dc.date.accessioned | 2009-08-31 | - |
dc.date.available | 2009-08-31 | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2005-02 | - |
dc.identifier.citation | ORGANOMETALLICS, v.24, no.4, pp.603 - 611 | - |
dc.identifier.issn | 0276-7333 | - |
dc.identifier.uri | http://hdl.handle.net/10203/10861 | - |
dc.description.abstract | A series of chiral ansa zirconocene compounds that feature (i) [Me2Si] and [Me4Si2] bridges and (ii) two tert-butyl substituents on each cyclopentadienyl ring, namely, rac-[Me2Si(CPBut2)(2)]ZrCl2, rac-[Me2Si(CPBut2)(2)]Zr(Ph)Cl, rac-[Me2Si(CPBut2)(2)] ZrMe2, rac-[Me2Si(CPBut2)(2)]Zr(CO)(2), rac-[Me4Si2(Cp-But2)(2)] ZrCl2, and rac-[Me4Si2(CPBut2)(2)]Zr(CO)(2), has been synthesized. In each case, the complex exists as the racemo isomer due to inter-ring steric interactions between the But substituents proximal to the ansa bridge that destabilize the meso isomer. rac-[Me4Si2(Cp-But2)(2)]ZrCl2 is the first structurally characterized ansa zirconocene complex with a [Me4Si2] bridge that adopts a racemo geometry. IR spectroscopic studies on the dicarbonyl complexes (Cp-1,Cp-3-But2)(2)Zr(CO)(2), rac-[Me2Si(Cp-But2)(2)]Zr(CO)(2), and rac-[Me4Si2(Cp-But2)(2)]Zr(CO)(2) demonstrate that the [Me2Si] and [Me4Si2] ansa bridges have opposite electronic influences in this system, with the [Me2Si] bridge exerting an electron-withdrawing effect and the [Me4Si2] bridge exerting an electron-donating effect. The [Me2Si] and [Me4Si2] bridges also exert a different influence with respect to olefin polymerization, with {rac-[Me2Si(Cp-But2)(2)]ZrCl2/MAO} being a more active catalyst system for polymerization of ethylene than is either {(Cp-1,Cp-3-But2)(2)ZrCl2/MAO} or {rac-[Me4Si2(Cp-But2)(2)]ZrCl2/MAO}. | - |
dc.description.sponsorship | the U.S. Department of Energy, Office of Basic Energy Sciences (DE-FG02- 93ER14339) for support of this research | en |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | CRYSTAL-STRUCTURE | - |
dc.subject | METALLOCENE DERIVATIVES | - |
dc.subject | OLEFIN POLYMERIZATION | - |
dc.subject | PROPENE POLYMERIZATION | - |
dc.subject | HIGH-PRESSURE | - |
dc.subject | CATALYSTS | - |
dc.subject | DICHLORIDES | - |
dc.subject | ZIRCONIUM | - |
dc.subject | CHEMISTRY | - |
dc.subject | REACTIVITY | - |
dc.title | Chiral Ansa zirconocene compounds with [Me2Si] and [Me4Si2] bridges and with tert-butyl ring substituents: Synthesis and structural characterization of the racemo complexes rac-[Me2Si(C5H2-2,4-Bu-2(t))2]ZrCl2 and rac-[Me4Si2(C5H2-2,4-Bu-2(t))(2)]ZrCl2 | - |
dc.type | Article | - |
dc.identifier.wosid | 000226924800020 | - |
dc.identifier.scopusid | 2-s2.0-14644387545 | - |
dc.type.rims | ART | - |
dc.citation.volume | 24 | - |
dc.citation.issue | 4 | - |
dc.citation.beginningpage | 603 | - |
dc.citation.endingpage | 611 | - |
dc.citation.publicationname | ORGANOMETALLICS | - |
dc.identifier.doi | 10.1021/om049273j | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Churchill, David G | - |
dc.contributor.nonIdAuthor | Zachmanoglou, CE | - |
dc.contributor.nonIdAuthor | Melnick, JG | - |
dc.contributor.nonIdAuthor | Bridgewater, BM | - |
dc.contributor.nonIdAuthor | Parkin, G | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | CRYSTAL-STRUCTURE | - |
dc.subject.keywordPlus | METALLOCENE DERIVATIVES | - |
dc.subject.keywordPlus | OLEFIN POLYMERIZATION | - |
dc.subject.keywordPlus | PROPENE POLYMERIZATION | - |
dc.subject.keywordPlus | HIGH-PRESSURE | - |
dc.subject.keywordPlus | CATALYSTS | - |
dc.subject.keywordPlus | DICHLORIDES | - |
dc.subject.keywordPlus | ZIRCONIUM | - |
dc.subject.keywordPlus | CHEMISTRY | - |
dc.subject.keywordPlus | REACTIVITY | - |
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