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DOI: 10.1055/s-0028-1083563
Aerobic Oxidation of Alcohols with Gold Nanoparticles
Contributor(s):Yasuhiro Uozumi, Takao OsakoNational Institute of Advanced Science and Technology, Sendai, Japan
Amphiphilic Block Copolymer-Stabilized Gold Nanoparticles for Aerobic Oxidation of Alcohols in Aqueous Solution
Chem. Commun. 2008, 4442-4444
Publication History
Publication Date:
20 November 2008 (online)
Key words
gold - amphiphilic block copolymers - alcohol oxidation
Significance
Amphiphilic block copolymer-stabilized gold nanoparticles (Au-sol) were prepared by the reduction of HAuCl4 in an aqueous solution of P123 (EO20PO70EO20) using NaBH4. The gold nanoparticles catalyzed the oxidation of various alcohols in aqueous solution under O2 to give the corresponding oxidized products in 27-100% conversions (7 examples). TEM analysis showed that the nanoparticles were enlarged after the reaction. In the first reusing run of the catalyst, the conversion for the oxidation of cyclooctanol decreased to 72%.
Comment
The formation of the gold nanoparticles was confirmed by UV-Vis, TEM, and XRD. In aqueous solution, the colloidal nanoparticles were stable at 80 ˚C for five hours without color change and precipitation. The catalytic activity of Au-sol for the oxidation of 4-methoxylbenzyl alcohol was superior to other supported catalysts such as Au/Al2O3, Pd/Al2O3, and Au/Pd/Al2O3.