Development of a Clean Carbon Recycleing System from Environmentally Hazardous Substances with the Key to the Formation and Cleavage of Cobalt-Carbon Bonds

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  • Shimakoshi Hisashi
    Department of Chemistry and Biochemistry, Faculty of Engineering, Kyushu University

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  • 環境負荷物質からの炭素循環システムの創製を目指したコバルト-炭素結合の生成と開裂を鍵とするクリーン物質変換システムの開発

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<p>The bioinspired catalyst system was developed in the interdisciplinary fields of bioinorganic chemistry and catalytic chemistry. In nature, enzymes catalyze various molecular transformations under mild conditions with a high efficiency and selectivity. Therefore, we can learn about many excellent systems from nature. As for the catalyst design, a metal complex inspired by the active site of a metal enzyme has been developed and the combination of the metal complex with a redox system should form an excellent catalytic system. Based on this concept, we can use various redox systems such as electrochemistry and photo-excited chemistry to construct a catalyst system. Among the metal complexes inspired from natural metal enzymes, the cobalt ion containing the B12 derivative is the focus on this account. Organometallic B12 complexes are unique metal complexes having a cobalt-carbon σ-bond that exist in biological systems. Cleavage of the metal-organic σ-bond initiates many B12 dependent enzymatic reactions. Based on the unique properties of alkylated cobalt complex, many B12-inspired reactions have been developed. Here the visible light driven B12 inspired reaction for the synthesis of various compounds from organic halides as carbon source were summarized, and the combination of the B12 derivative as redox catalyst in electroorganic synthesis for the conversion of various trichloromethylated organic compounds to amides was reviewed.</p>

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