Polymerization of Propylene by Silylene- and Germylene-Bridged Group 4 Metallocenes

In order to compare with silylene-bridged group 4 metallocenes, C2 symmetric dimethylgermylene-bridged zirconocene and hafnocene dichlorides were prepared and employed as the catalyst for polymerization of propylene in combination with methylaluminoxane (MAO). Germylene-bridged metallocenes always p...

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Published inKOBUNSHI RONBUNSHU Vol. 59; no. 4; pp. 243 - 249
Main Authors YAMAZAKI, Hiroshi, KOYAMA, Mina, HATTORI, Yoshiko, NAKANO, Masato, USHIODA, Tsutomu, YAMAGUCHI, Yoshitaka, SUZUM, Noriyuki, MISE, Takaya, WAICATSUKI, Yasuo
Format Journal Article
LanguageJapanese
Published Tokyo The Society of Polymer Science, Japan 25.04.2002
Tsukiji daisan nagaoka
Subjects
Germylene Bridge
Group 4 Metallocene
Hafnocene
Isotactic Polymerization
Polymer
Propylene
Silylene Bridge
X-ray Structure
Zirconocene
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Abstract In order to compare with silylene-bridged group 4 metallocenes, C2 symmetric dimethylgermylene-bridged zirconocene and hafnocene dichlorides were prepared and employed as the catalyst for polymerization of propylene in combination with methylaluminoxane (MAO). Germylene-bridged metallocenes always produced isotactic polypropylene of higher molecular weight than that produced by silylenebridged analogues. The molecular structures of four metallocenes prepared from dimethylsilylene and germylenebis (2, 3, 5-trimethylcyclopentadienyl) were detemined by X-ray diffraction and showed no substantial differences of geometry between silylene- and germylene-bridged ones.
AbstractList In order to compare with silylene-bridged group 4 metallocenes, C2 symmetric dimethylgermylene-bridged zirconocene and hafnocene dichlorides were prepared and employed as the catalyst for polymerization of propylene in combination with methylaluminoxane (MAO). Germylene-bridged metallocenes always produced isotactic polypropylene of higher molecular weight than that produced by silylenebridged analogues. The molecular structures of four metallocenes prepared from dimethylsilylene and germylenebis (2, 3, 5-trimethylcyclopentadienyl) were detemined by X-ray diffraction and showed no substantial differences of geometry between silylene- and germylene-bridged ones.
Author KOYAMA, Mina
WAICATSUKI, Yasuo
YAMAGUCHI, Yoshitaka
SUZUM, Noriyuki
YAMAZAKI, Hiroshi
HATTORI, Yoshiko
USHIODA, Tsutomu
NAKANO, Masato
MISE, Takaya
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  organization: Department of Applied Chemistry, Chuo University
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  fullname: NAKANO, Masato
  organization: Chisso Petrochemical Corporation
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  fullname: USHIODA, Tsutomu
  organization: Chisso Petrochemical Corporation
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  fullname: WAICATSUKI, Yasuo
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Snippet In order to compare with silylene-bridged group 4 metallocenes, C2 symmetric dimethylgermylene-bridged zirconocene and hafnocene dichlorides were prepared and...
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SubjectTerms Germylene Bridge
Group 4 Metallocene
Hafnocene
Isotactic Polymerization
Polymer
Propylene
Silylene Bridge
X-ray Structure
Zirconocene
Title Polymerization of Propylene by Silylene- and Germylene-Bridged Group 4 Metallocenes
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