Copolymerization of Ethylene with iPr₃Si-Protected 5-Hexen-1-ol with an [OSSO]-Type Bis(phenolato) Dichloro Zirconium(Ⅳ) Complex

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  • Saito Yusuke
    Department of Chemistry, Graduate School of Science and Engineering, Saitama University
  • Nakata Norio
    Department of Chemistry, Graduate School of Science and Engineering, Saitama University
  • Ishii Akihiko
    Department of Chemistry, Graduate School of Science and Engineering, Saitama University

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  • Copolymerization of Ethylene with <i><sup>i</sup></i>Pr<sub>3</sub>Si-Protected 5-Hexen-1-ol with an [OSSO]-Type Bis(phenolato) Dichloro Zirconium(IV) Complex
  • Copolymerization of Ethylene with <i>i</i>Pr3Si-Protected 5-Hexen-1-ol with an [OSSO]-Type Bis(phenolato) Dichloro Zirconium(IV) Complex

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The ability of dichlorozirconium(IV) complex 4 incorporating an [OSSO]-type bis(phenolate) ligand with dMAO (dried methylaluminoxane) as an activator for the copolymerization of ethylene with iPr3Si-protected 5-hexen-1-ol, 5-hexen-1-oxytriisopropylsilane (5H1OSi), is described. This catalyst system efficiently promoted ethylene copolymerization with different feed ratios of 5H1OSi at 25 °C under an atmospheric pressure producing ethylene/5H1OSi copolymers with molecular weights Mw of 3800–10800 g mol−1. In the 1H NMR spectroscopic analysis, the contents of 5H1OSi in the copolymers were found to be in the range of 7.5–21.4 mol % depending upon the feed concentration of 5H1OSi. The sequence distributions and calculated reactive ratios (γEγP = 1.48–3.48) obtained from the 13C NMR spectra revealed that the catalytic system produced highly random ethylene/5H1OSi copolymers.

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