Synthesis, characterization and catalytic function of a B12-hyperbranched polymer

Keishiro Tahara; Hisashi Shimakoshi; Akihiro Tanaka; Yoshio Hisaeda

doi:10.1039/B923924C

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Synthesis, characterization and catalytic function of a B₁₂-hyperbranched polymer†

Keishiro Tahara,^a Hisashi Shimakoshi,^a Akihiro Tanaka^ab and Yoshio Hisaeda*^a

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* Corresponding authors

^a Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka, Japan
E-mail: yhisatcm@mail.cstm.kyushu-u.ac.jp
Fax: +81-92-802-2827
Tel: +81-92-802-2826

^b Synthesis Research Department, Chemical Research Laboratory, Nissan Chemical Industries, Ltd, Funahashi, Japan

Abstract

A new hybrid catalyst composed of a vitamin B₁₂ derivative and a hyperbranched polymer (HBP) was synthesized and characterized by UV-vis and ESR spectroscopy as well as AFM. The B₁₂-HBP showed good properties as a homogenous catalyst. The covalently-immobilized B₁₂ moieties were efficiently solvated and the cobalt centers were accessible for pyridine guests. The B₁₂-HBP showed high reactivity to 2-phenethylbromide and increased selectivity for reductive dimerization in the presence of TiO₂ with UV light irradiation.

This article is part of the themed collection: Bioinspired catalysis

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Article information

DOI: https://doi.org/10.1039/B923924C
Article type: Paper
Submitted: 13 Nov 2009
Accepted: 05 Jan 2010
First published: 20 Jan 2010

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Dalton Trans., 2010,39, 3035-3042

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Synthesis, characterization and catalytic function of a B₁₂-hyperbranched polymer

K. Tahara, H. Shimakoshi, A. Tanaka and Y. Hisaeda, Dalton Trans., 2010, 39, 3035 DOI: 10.1039/B923924C

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Dalton Transactions