2006年1月
Stereospecific polymerization of propylene with group 4 ansa-fluorenylamidodimethyl complexes
Journal of Organometallic Chemistry
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- 巻
- 691
- 号
- 1-2
- 開始ページ
- 193
- 終了ページ
- 201
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jorganchem.2005.08.027
- 出版者・発行元
- Elsevier
Group 4 [η1:η3-tert- butyl(dimethylfluorenylsilyl)amido]dimethyl complexes [t-BuNSiMe 2Flu]MMe2 (M = Ti, 1; Zr, 2; Hf, 3) were synthesized in a one-pot synthesis starting from the ligand, MeLi and MCl4 (M = Ti, Zr, Hf), respectively. The structures of these complexes were determined by X-ray crystallography and the results obtained revealed that the fluorenyl ligand coordinates to center metal in a η3-manner irrespective of center metal employed. Propylene polymerization was conducted at 0 or 20 °C in toluene by 1-3 combined with dried methylaluminoxane (MAO), which was prepared from the toluene solutions of MAO by removing free trialkylaluminiums, and HNMe2PhB(C6F5)4 in the presence of triisobutylaluminium. The 1-dried MAO system gave the polymer with syndiotactic triad (rr) of 63 0x1.e2fc8p-891t 0 °C, whereas 2 and 3 did not give any polymer in the same conditions. The 2-dried MAO system gave the polymer with the highest syndiotacticity (rr = 97%) at 20 °C, although the activity was low. The 3-dried MAO system did not give any polymer even at 20 °C. When HNMe2PhB(C6F5)4 was used in place of dried MAO at 20 °C, 1 gave almost atactic polymer, while 2 and 3 gave highly syndiotactic one (rr > 90%). These results indicate that the catalytic performance strongly depended on the center metal of the ansa- fluorenylamidodimethyl complexes as well as cocatalysts employed.
- リンク情報
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- DOI
- https://doi.org/10.1016/j.jorganchem.2005.08.027
- CiNii Articles
- http://ci.nii.ac.jp/naid/120005624364
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000234132900025&DestApp=WOS_CPL
- URL
- http://ir.lib.hiroshima-u.ac.jp/00014676
- ID情報
-
- DOI : 10.1016/j.jorganchem.2005.08.027
- ISSN : 0022-328X
- CiNii Articles ID : 120005624364
- Web of Science ID : WOS:000234132900025