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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behavior can be attributed to the thermal instability of the trialkyl complexes at elevated temperatures: Rahim, M. Unpublished results.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.
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85037466539
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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.
-
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-
29
-
-
85037462750
-
-
note
-
Complex 3b is essentially inactive for ethylene polymerization at this low loading of MAO.
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30
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32
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85037470109
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and references therein
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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.
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33
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0000804396
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Department of Chemistry, University of Vermont: Burlington, VT 05401
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36
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85037477559
-
-
note
-
CH = 118 and 114 Hz for the terminal Zr-Me groups in 3b and 4, respectively.
-
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37
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0030456858
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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.
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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.
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39
-
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85037451281
-
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note
-
8 3:1), the signals dues to terminal and bridging Me groups are still significantly exchange-broadened.
-
-
-
-
40
-
-
85037490508
-
-
note
-
8 solution.
-
-
-
-
41
-
-
85037489758
-
-
note
-
2/hexane mixtures led to formation of oils and/or formation of complex 5.
-
-
-
-
42
-
-
85037460081
-
-
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.
-
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43
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0000193673
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Healey, M. D.; Wierda, D. A.; Barron, A. R. Organometallics 1988, 7, 2543.
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85037465580
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Unpublished results
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5 solution; the relevance of this observation to polymerizations conducted in toluene remains to be determined. Tomaszewski, R. Unpublished results.
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Tomaszewski, R.1
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85037477713
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note
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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.
-
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