Multinuclear cobalt-salen complexes with phenylene linker for epoxide polymerizations

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  • Yo Hiranoi
    Department of Organic and Polymer Materials Chemistry; Tokyo University of Agriculture and Technology; Koganei Tokyo 184-8588 Japan
  • Miho Hatanaka
    Department of Chemistry; Faculty of Science and Engineering, Kindai University; Higashiosaka Osaka 577-8502 Japan
  • Koji Nakano
    Department of Organic and Polymer Materials Chemistry; Tokyo University of Agriculture and Technology; Koganei Tokyo 184-8588 Japan

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Di- and trinuclear cobalt (Co)–salen complexes with a benzene ring as a rigid linker were explored for epoxide polymerizations. The dinuclear Co–salen complex with a 1,2-phenylene linker showed higher catalytic activity than the dinuclear Co–salen complex with a 1,3-phenylene linker and the trinuclear Co–salen complex with a 1,3,5-benzenetriyl linker for the copolymerization of propylene oxide (PO) with carbon dioxide. A combination of the absolute configuration of the two Co–salen moieties was found to affect its catalytic activity. The optimized dinuclear Co–salen complex with a heterochiral combination demonstrated highest activity and maintained its catalytic activity under a low catalyst concentration. The heterochiral dinuclear Co–salen complex also showed high activity for the copolymerization of PO with cyclic anhydride. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017

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