Issue 13, 2010

Photo-induced ring-expansion reactions mediated by B12-TiO2 hybrid catalyst

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-TiO2 was activated to form the supernucleophilic Co(I) species of B12 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.

Graphical abstract: Photo-induced ring-expansion reactions mediated by B12-TiO2 hybrid catalyst

Supplementary files

Article information

Article type
Paper
Submitted
20 Oct 2009
Accepted
14 Jan 2010
First published
09 Feb 2010

Dalton Trans., 2010,39, 3302-3307

Photo-induced ring-expansion reactions mediated by B12-TiO2 hybrid catalyst

S. Izumi, H. Shimakoshi, M. Abe and Y. Hisaeda, Dalton Trans., 2010, 39, 3302 DOI: 10.1039/B921802E

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