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Volumn 32, Issue 2, 1999, Pages 264-269

Evidence of zircononium-polymeryl ion pairs from 13C NMR in situ 13C2H4 polymerization with Cp2Zr(13CH3)2-based catalysts

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINUM COMPOUNDS; CATALYSTS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; ORGANOMETALLICS; POLYMERIZATION; ZIRCONIUM COMPOUNDS;

EID: 0032755158     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma981164r     Document Type: Article
Times cited : (67)

References (44)
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    • For recent reviews, see, for example: (a) Fink, G.; Mülhaupt, R.; Brintzinger, H. H. Ziegler Catalysts; Springer: Berlin, 1995. (b) Synthetic, Structural and Industrial Aspects of Stereospecific Polymerization; Tritto, I., Giannini, U., Eds.; Macromol. Symp. 1995, 89. (c) Brintzinger, H. H.; Fischer, D.; Mülhaupt, R.; Rieger, B.; Waymouth, R. M. Angew. Chem., Int. Ed. Engl. 1995, 14, 1145. (d) Bochmann, M. J. Chem. Soc., Dalton Trans. 1996, 255. (e) Kaminsky, W. Macromol. Chem. Phys. 1996, 197, 3907 and references therein.
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    • 8c
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    • note
    • 9b
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    • 10b
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    • Unpublished results of our laboratory
    • Unpublished results of our laboratory.
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    • note
    • 8 at -20°C) due to the additional β and γ effects of the polymer chain. Signals of the methylenes in the β and γ positions with respect to aluminum are shifted downfield with respect to the α methylenes because of the greater distance with respect to the aluminum.
  • 37
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    • note
    • Signals of the methylenes in the β position with respect to zirconium are shifted highfield with respect to the α methylenes (the signals between 54 and 64 ppm). Because of the greater distance with respect to the zirconium, they have chemical shifts closer to the methylenes of the polyethylene chain. In a similar way, the signals of the methylenes in the β and γ positions with respect to titanium are reported to be shifted highfield with respect to the methylenes adjacent to titanium in ref 11.
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    • Unpublished results of our laboratory
    • Unpublished results of our laboratory.
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    • note
    • CH = 120.7 and 118 Hz, μ-Me = 23.2 and 22.85 ppm).
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    • Fink, G., Mülhaupt, R., Brintzinger, H., Eds.; Springer: Berlin
    • (b) Haselwander, T.; Beck, S.; Brintzinger, H. H. In Ziegler Catalysts; Fink, G., Mülhaupt, R., Brintzinger, H., Eds.; Springer: Berlin, 1995; p 182.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.