Synthesis of Thermoplastic Elastomers by Yttrium-Catalyzed Isospecific <i>Trans</i>-1,4-Polymerization of (<i>E</i>)-1,3-Pentadiene

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  • Kei Nishii
    Organometallic Chemistry Laboratory, RIKEN, Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan
  • Guangli Zhou
    State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
  • Yusuke Saito
    Organometallic Chemistry Laboratory, RIKEN, Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan
  • Atsushi Yamamoto
    Organometallic Chemistry Laboratory, RIKEN, Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan
  • Masayoshi Nishiura
    Organometallic Chemistry Laboratory, RIKEN, Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan
  • Yi Luo
    State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
  • Zhaomin Hou
    Organometallic Chemistry Laboratory, RIKEN, Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan

抄録

<jats:title>Abstract</jats:title> <jats:p>Regio- and stereoselectivity control in the polymerization of 1,3-conjugated dienes is of much interest and importance. We report herein for the first time the isospecific trans-1,4-selective living polymerization of (E)-1,3-pentadiene (EPD) by a C5H5-ligated yttrium catalyst (C5H5)Y(CH2C6H4-NMe2-o)2/[Ph3C][B(C6F5)4], which afforded crystalline isotactic-trans-1,4-polypentadiene showing good elastic properties without vulcanization (tensile strength up to 7.1 MPa with elongation at break of 2600%). The DFT calculations revealed that the stereoselectivity was mainly due to steric repulsion between the C5H5 ligand in the catalyst and the methyl group in EPD.</jats:p>

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