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Volumn 95, Issue 1, 1995, Pages 167-183

Polymerization with metallocene catalysts. Hydrooligomerization and NMR investigations concerning the microstructure of poly(cyclopentenes)

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EID: 84986776455     PISSN: 10221360     EISSN: 15213900     Source Type: Journal    
DOI: 10.1002/masy.19950950115     Document Type: Article
Times cited : (39)

References (28)
  • 1
    • 84986781714 scopus 로고    scopus 로고
    • 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.
  • 2
    • 84986794855 scopus 로고    scopus 로고
    • 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
  • 4
    • 84986775872 scopus 로고
    • S. Collins presentation at the “Worldwide Metallocene Conference”; Houston, Texas
    • (1994)
    • Kelly, W.M.1    Taylor, N.J.2
  • 7
    • 84986769004 scopus 로고    scopus 로고
    • 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.
  • 14
    • 84986769075 scopus 로고    scopus 로고
    • Site isomerization errors or two consecutive elimination, readdition reactions are other possible explanations.
  • 16
    • 84986769065 scopus 로고
    • 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.
    • (1992) J. Organomet. Chem. , vol.424
    • Bochmann, M.1    Jaggar, A.J.2
  • 20
    • 11944254119 scopus 로고
    • For theoretical calculations see: A. Castonguay,. H. Kawamura‐Kuribayashi, N. Koga, K. Morokuma, J. Am. Chem. Soc. 114 (1992), 8687
    • (1992) J. Am. Chem. Soc. , vol.114 , pp. 5832
    • Rappe, A.K.1
  • 22
    • 0011631966 scopus 로고
    • 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.
    • (1992) J. Am. Chem. Soc. , vol.114 , pp. 4174
    • Peng, T.‐S.1    Gladysz, J.A.2
  • 25
    • 84986818025 scopus 로고    scopus 로고
    • 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].
  • 26
    • 84986818057 scopus 로고    scopus 로고
    • have proposed another mechanism based on consecutive elimination, readdition steps involving olefin rotation [23].
    • Busico, V.1
  • 28
    • 84986818028 scopus 로고    scopus 로고
    • The same holds for the propene/ethene copolymerization. See for example [8] and [19].


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