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Título

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

AutorGrirrane, Abdessamad; Corma, Avelino; García Gómez, Hermenegildo
Palabras claveAromatic azo compounds
Synthesis
Catalysis
Gold nanoparticles
Environmental friendly industrial processes
Fecha de publicación12-dic-2008
EditorAmerican Association for the Advancement of Science
CitaciónScience 322(5908): 1661-1664 (2008)
ResumenThe 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.
Descripción4 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
Versión del editorhttp://www.sciencemag.org/cgi/content/abstract/322/5908/1661
URIhttp://hdl.handle.net/10261/9240
DOI10.1126/science.1166401
ISSN0036-8075
E-ISSN1095-9203
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