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Volumn 13, Issue 18, 2007, Pages 5294-5299

Modification of methylaluminoxane-activated ansa-zirconocene catalysts with triisobutylaluminum - Transformations of reactive cations studied by NMR spectroscopy

Author keywords

Aluminum alkyls; Metallocenes; Methylaluminoxane; Polymerization; Structure activity relationships

Indexed keywords

ALUMINUM COMPOUNDS; CHEMICAL MODIFICATION; DIMERS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; ORGANOMETALLICS; POLYMERIZATION;

EID: 34347257480     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200601801     Document Type: Article
Times cited : (35)

References (47)
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    • G. Gregorius, V. Fraaije, M. Lutringhauser, patent application. DP 10258968.2, 2002, WO 055070, 2004.
    • G. Gregorius, V. Fraaije, M. Lutringhauser, patent application. DP 10258968.2, 2002, WO 055070, 2004.
  • 11
    • 34347247242 scopus 로고    scopus 로고
    • patent application, US 673302, WO 033152, 2005
    • S. Wang, patent application, US 673302, 2003, WO 033152, 2005.
    • (2003)
    • Wang, S.1
  • 28
    • 34347248350 scopus 로고    scopus 로고
    • This drying procedure (see the Experimental Section) is also necessary to remove most of the undeuterated solvent. In addition, the high content of free trimethylaluminum in commercial MAO (≈30% of the total Al content) would interfere with the formation of the species IIIiBuMe and III iBu2, according to the equilibria in Equations (3) and (4, Its reduction to ≈5% of the total Al content in dried MAO, while possibly affecting its long-term storage properties, leaves its activation properties intact for periods of at least several days. See, for example; E. Rytter, M. Ystenes, J. L. Eilertsen, M. Ott, J. A. Stovneng. J. Liu in Orguno-metallic Catalysts and Olefin Polymerization Eds, R. Blom, A. Follestad, E. Rytter, M. Tilset, M. Ystenes, Springer, Berlin, 2002, p. 23
    • iBu2, according to the equilibria in Equations (3) and (4). Its reduction to ≈5% of the total Al content in dried MAO - while possibly affecting its long-term storage properties - leaves its activation properties intact for periods of at least several days. See, for example; E. Rytter, M. Ystenes, J. L. Eilertsen, M. Ott, J. A. Stovneng. J. Liu in Orguno-metallic Catalysts and Olefin Polymerization (Eds.: R. Blom, A. Follestad, E. Rytter, M. Tilset, M. Ystenes), Springer, Berlin, 2002, p. 23.
  • 31
    • 34347266478 scopus 로고    scopus 로고
    • iBu2 were observed; these signals are probably not sufficiently separated from those of the other AliBu species present.
    • iBu2 were observed; these signals are probably not sufficiently separated from those of the other AliBu species present.
  • 32
    • 34347239248 scopus 로고    scopus 로고
    • iBu2.
    • iBu2.
  • 33
    • 34347261662 scopus 로고    scopus 로고
    • By double-resonance experiments
    • By double-resonance experiments.
  • 34
    • 34347213715 scopus 로고    scopus 로고
    • term] will just cancel these statistical factors, such that the statistical factors for the reactions in Equations (3) and (4) are determined solely by the numbers of iBu to Me terminal groups in the complexes of type III involved.
    • term] will just cancel these statistical factors, such that the statistical factors for the reactions in Equations (3) and (4) are determined solely by the numbers of iBu to Me terminal groups in the complexes of type III involved.
  • 35
    • 34347244531 scopus 로고    scopus 로고
    • 4.
    • 4.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.