Photo-induced ring-expansion reactions mediated by B12-TiO 2 hybrid catalyst

Shin Ichiro Izumi; Hisashi Shimakoshi; Masaaki Abe; Yoshio Hisaeda

doi:10.1039/b921802e

Photo-induced ring-expansion reactions mediated by B₁₂-TiO ₂ hybrid catalyst

Shin Ichiro Izumi, Hisashi Shimakoshi, Masaaki Abe, Yoshio Hisaeda

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Vitamin B₁₂-TiO₂ heterogeneous hybrid catalyst (B₁₂-TiO₂) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B₁₂-TiO ₂ was activated to form the supernucleophilic Co(i) species of B ₁₂ by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B₁₂- TiO₂ catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO₂ nanoparticle surfaces had a crucial role in the overall catalytic reaction.

Original language	English
Pages (from-to)	3302-3307
Number of pages	6
Journal	Dalton Transactions
Volume	39
Issue number	13
DOIs	https://doi.org/10.1039/b921802e
Publication status	Published - Mar 23 2010

All Science Journal Classification (ASJC) codes

Inorganic Chemistry

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abstract = "Vitamin B12-TiO2 heterogeneous hybrid catalyst (B12-TiO2) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B12-TiO 2 was activated to form the supernucleophilic Co(i) species of B 12 by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B12- TiO2 catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO2 nanoparticle surfaces had a crucial role in the overall catalytic reaction.",

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T1 - Photo-induced ring-expansion reactions mediated by B12-TiO 2 hybrid catalyst

AU - Izumi, Shin Ichiro

AU - Shimakoshi, Hisashi

AU - Abe, Masaaki

AU - Hisaeda, Yoshio

PY - 2010/3/23

Y1 - 2010/3/23

N2 - Vitamin B12-TiO2 heterogeneous hybrid catalyst (B12-TiO2) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B12-TiO 2 was activated to form the supernucleophilic Co(i) species of B 12 by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B12- TiO2 catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO2 nanoparticle surfaces had a crucial role in the overall catalytic reaction.

AB - Vitamin B12-TiO2 heterogeneous hybrid catalyst (B12-TiO2) mediated ring-expansion reactions and their reaction mechanism were clarified by various spectroscopic methods. Diffuse reflectance UV/VIS (DR-UV/VIS) studies showed that B12-TiO 2 was activated to form the supernucleophilic Co(i) species of B 12 by irradiation with ultraviolet light. DR-UV/VIS and electron spin resonance (ESR) studies then elucidated the formation of the photo-sensitive intermediate on heterogeneous surfaces. The photo-excited B12- TiO2 catalyzed ring-expansion reactions were efficient and eco-friendly. This catalytic efficiency was strongly dependent on the kind of solvent. The oxidation reaction of the solvent by holes at TiO2 nanoparticle surfaces had a crucial role in the overall catalytic reaction.

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Photo-induced ring-expansion reactions mediated by B₁₂-TiO ₂ hybrid catalyst

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