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Chiral (Salen) Cobalt Complexes Encapsulated in Mesoporous MFI as an Enantioselective Catalyst for Asymmetric Ring Opening of Terminal Epoxides

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Abstract

MFI structural zeolite (ZSM-5 and Sililcalite) was treated with hot NaOH solution to make mesoporous channels in the microporous crystals. Inner mesopore size could be controlled by changing the concentration of NaOH solution. The pore structure of alkaline-treated MFI zeolite was studied by instrumental analysis. To obtain the cage type mesopores, Ti-coating on the outside MFI crystals before alkaline treatment was investigated to be the most effective. Co(III) salen complexes monomers were successfully encapsulated in mesoporous MFI-type zeolite by “ship-in-a-bottle” method. The heterogeneous catalyst could be applied in asymmetric ring opening of terminal epoxides by phenol derivatives. It showed very high enantioselectivity with yield in the catalysis.

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Acknowledgment

This research was supported by KJBSC (Korea-Japan basic scientific cooperation) program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology.

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Authors and Affiliations

  1. Department of Chemical Engineering, Inha University, Incheon, 402-751, South Korea

    Xiao-Feng Guo, Yong-Suk Kim & Geon-Joong Kim

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  1. Xiao-Feng Guo
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  2. Yong-Suk Kim
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  3. Geon-Joong Kim
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Correspondence to Geon-Joong Kim.

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Guo, XF., Kim, YS. & Kim, GJ. Chiral (Salen) Cobalt Complexes Encapsulated in Mesoporous MFI as an Enantioselective Catalyst for Asymmetric Ring Opening of Terminal Epoxides. Top Catal 52, 153–160 (2009). https://doi.org/10.1007/s11244-008-9144-6

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