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1
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84986781714
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This publication is Part II of a series on the microstructures of poly(cycloolefines). Part 1: M. Arndt, R. Engehausen, W. Kaminsky, K. Zoumis; submitted to J. Mol. Catal.
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2
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84986794855
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This work as well as part 1 is part of a dissertation: M. Arndt: Grundlagen und Mechanismen der Polymerisation von Cycloolefinen unter Verwendung homogener Ziegler‐Natta‐Katalysatoren, Verlag Shaker Aachen (1994), ISBN 3‐8265‐0074‐1/ISSN 945‐070X
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4
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84986775872
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S. Collins presentation at the “Worldwide Metallocene Conference”; Houston, Texas
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(1994)
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Kelly, W.M.1
Taylor, N.J.2
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7
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84986769004
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2/MAO was claimed to produce less than 1% of trans‐1,3‐units in [4]. We could not detect any trans hydrotrimer, but our polymer spectrum shows some trans enchainments.
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14
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84986769075
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Site isomerization errors or two consecutive elimination, readdition reactions are other possible explanations.
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16
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84986769065
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This has been suggested by others, too:, C5. M. Bochmann, S.L. Lancaster, J. Organomet. Chem. 434 (1992), C1. J.J. Eisch, S.I. Pombrik, G.‐X. Zheng, Organometallics 12 (1993), 3856. J.J. Eisch, S.I. Pombrik, G.‐X. Zheng, Makromol. Chem. Macromol. Symp. 66 (1993), 109. C. Pellecchia, A. Immirzi, A. Grassi, A. Zambelli, Organometallics 12 (1993), 4473.
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(1992)
J. Organomet. Chem.
, vol.424
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Bochmann, M.1
Jaggar, A.J.2
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20
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11944254119
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For theoretical calculations see: A. Castonguay,. H. Kawamura‐Kuribayashi, N. Koga, K. Morokuma, J. Am. Chem. Soc. 114 (1992), 8687
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(1992)
J. Am. Chem. Soc.
, vol.114
, pp. 5832
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Rappe, A.K.1
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21
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0009740473
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Brintzinger recently has shown that β‐hydrogen elimination may involve β‐H transfer to a second monomer or the transition metal, the later we discuss here., K. Soga, M. Terano, Kodansha Ltd., Tokyo
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(1994)
Catalyst Design for Tailor‐Made Polyolefins
, pp. 193
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Brintzinger, H.1
Beck, S.2
Leclerc, M.3
Stehling, U.4
Röll, W.5
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22
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0011631966
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Olefin rotation as well as non‐dissoziative π‐face migration in transition metal olefin complexes has been shown by others to occur:, T.‐S. Peng, J. Pu, J.A. Gladysz, Organometallics 13 (1994), 929 and references therein.
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(1992)
J. Am. Chem. Soc.
, vol.114
, pp. 4174
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Peng, T.‐S.1
Gladysz, J.A.2
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25
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84986818025
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Such a structure will hinder the approach of a new monomer to the active center, thereby β‐agostic stabilization and β‐hydrogen elimination may either reverse the reaction or lead to the formation of 1,1‐dimethyl substituted endgroups. These have been found in propene oligomerization at low monomer concentrations [24].
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26
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84986818057
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have proposed another mechanism based on consecutive elimination, readdition steps involving olefin rotation [23].
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Busico, V.1
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28
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84986818028
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The same holds for the propene/ethene copolymerization. See for example [8] and [19].
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