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Gold-Catalyzed Synthesis of Aromatic Azo Compounds from Anilines and Nitroaromatics

AuthorsGrirrane, Abdessamad; Corma, Avelino ; García Gómez, Hermenegildo
KeywordsAromatic azo compounds
Gold nanoparticles
Environmental friendly industrial processes
Issue Date12-Dec-2008
PublisherAmerican Association for the Advancement of Science
CitationScience 322(5908): 1661-1664 (2008)
AbstractThe selective formation of aromatic azo compounds at preparative or industrial levels requires stoichiometric amounts of environmentally unfriendly transition metals or nitrites. Here, we show that gold nanoparticles supported on titanium dioxide (TiO2) and nanoparticulated cerium dioxide (CeO2) catalyze the aerobic oxidation of aromatic anilines to aromatic azo compounds with yields above 98% under mild reaction conditions. Gold on TiO2 can also act as a reductive catalyst to access the compound directly from nitroaromatics through a two-step, one-pot reaction. The catalytic process shows promise for efficient synthesis of symmetric aromatic azo compounds, and even a range of asymmetric aromatic azo compounds.
Description4 pages.-- Supplementary material available at the publisher's site: Materials and methods, figs S1-S3, table S1.
Final version of the paper available at: http://dx.doi.org/10.1126/science.1166401
Publisher version (URL)http://www.sciencemag.org/cgi/content/abstract/322/5908/1661
Appears in Collections:(ITQ) Artículos
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