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Volumn 19, Issue 11, 2000, Pages 2161-2169

Ethylene polymerization using β-diketimine complexes of zirconium

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[No Author keywords available]

Indexed keywords


EID: 0000612331     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om9908027     Document Type: Article
Times cited : (119)

References (51)
  • 26
    • 0001607778 scopus 로고    scopus 로고
    • At least part of this behavior can be attributed to the thermal instability of the trialkyl complexes at elevated temperatures: Rahim, M. Unpublished results. For some recent work that sheds light on this phenomenon see: Qian, B.; Scanlon, W. J.; Smith, M. R., III; Motry, D. H. Organometallics 1999, 18, 1693.
    • (1999) Organometallics , vol.18 , pp. 1693
    • Qian, B.1    Scanlon, W.J.2    Smith III, M.R.3    Motry, D.H.4
  • 28
    • 85037466539 scopus 로고    scopus 로고
    • note
    • The mass flow meters used to monitor ethylene consumption in this work are accurate (and readable) from ca. 10-950 mL ethylene/ min. Peak flows corresponded to ca. 160 mL ethylene/min under these conditions.
  • 29
    • 85037462750 scopus 로고    scopus 로고
    • note
    • Complex 3b is essentially inactive for ethylene polymerization at this low loading of MAO.
  • 32
    • 85037470109 scopus 로고
    • and references therein
    • 3 to provide MAO with lower degrees of oligomerization. For a review of the chemistry and structure of MAO see: Makromol. Chem., Symp. 1995, 89, and references therein.
    • (1995) Makromol. Chem., Symp. , pp. 89
  • 33
    • 0000804396 scopus 로고
    • and references therein
    • For analogous studies involving metallocenium ions in bromobenzene solvent see: Horton, A. D.; Orpen, A. G. Organometallics 1991, 10, 3910, and references therein.
    • (1991) Organometallics , vol.10 , pp. 3910
    • Horton, A.D.1    Orpen, A.G.2
  • 36
    • 85037477559 scopus 로고    scopus 로고
    • note
    • CH = 118 and 114 Hz for the terminal Zr-Me groups in 3b and 4, respectively.
  • 37
    • 0030456858 scopus 로고    scopus 로고
    • 2(μ-Me) complexes see ref 10 and: (a) Chen, Y.-X.; Stern, C. L.; Yang, S.; Marks, T. J. J. Am. Chem. Soc. 1996, 118, 12451. (b) Beck, S.; Prosenc, M.-H.; Brintzinger, H.-H.; Goretski, R.; Herfert, N.; Fink, G. J. Mol. Cat. A: Chem. 1996, 111, 67.
    • (1996) J. Am. Chem. Soc. , vol.118 , pp. 12451
    • Chen, Y.-X.1    Stern, C.L.2    Yang, S.3    Marks, T.J.4
  • 39
    • 85037451281 scopus 로고    scopus 로고
    • note
    • 8 3:1), the signals dues to terminal and bridging Me groups are still significantly exchange-broadened.
  • 40
    • 85037490508 scopus 로고    scopus 로고
    • note
    • 8 solution.
  • 41
    • 85037489758 scopus 로고    scopus 로고
    • note
    • 2/hexane mixtures led to formation of oils and/or formation of complex 5.
  • 42
    • 85037460081 scopus 로고    scopus 로고
    • note
    • This procedure had to be used, as opposed to the more usual method of presaturating with ethylene, because the syringe invariably plugged with PE when 4 was introduced using the latter technique.
  • 45
    • 85037465580 scopus 로고    scopus 로고
    • Unpublished results
    • 5 solution; the relevance of this observation to polymerizations conducted in toluene remains to be determined. Tomaszewski, R. Unpublished results.
    • Tomaszewski, R.1
  • 46
    • 85037477713 scopus 로고    scopus 로고
    • note
    • For example, complex 3a (or 3b) is inactive for olefin polymerization at room temperature (as opposed to 70°C) in the presence of MAO (1000:1) for a period exceeding 4 h.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.