Synthesis, characterization and catalytic function of a B 12-hyperbranched polymer

Keishiro Tahara; Hisashi Shimakoshi; Akihiro Tanaka; Yoshio Hisaeda

doi:10.1039/b923924c

Synthesis, characterization and catalytic function of a B ₁₂-hyperbranched polymer

Keishiro Tahara, Hisashi Shimakoshi, Akihiro Tanaka, Yoshio Hisaeda

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15 Citations (Scopus)

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 TiO ₂ with UV light irradiation.

Original language	English
Pages (from-to)	3035-3042
Number of pages	8
Journal	Dalton Transactions
Volume	39
Issue number	12
DOIs	https://doi.org/10.1039/b923924c
Publication status	Published - Mar 19 2010

All Science Journal Classification (ASJC) codes

Inorganic Chemistry

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AU - Tahara, Keishiro

AU - Shimakoshi, Hisashi

AU - Tanaka, Akihiro

AU - Hisaeda, Yoshio

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AB - 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 TiO 2 with UV light irradiation.

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Synthesis, characterization and catalytic function of a B ₁₂-hyperbranched polymer

Abstract

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