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Towards selective synthesis of quinoxalines by using transition metals-doped carbon aerogels

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dc.contributor.authorGodino Ojer, Marina
dc.contributor.authorMorales Torres, Sergio
dc.contributor.authorMaldonado Hódar, Francisco J.
dc.contributor.authorPérez Mayoral, María Elena
dc.date.accessioned2025-03-18T08:31:23Z
dc.date.available2025-03-18T08:31:23Z
dc.date.issued2023-11-01
dc.descriptionThis is an Accepted Manuscript of an article published by Elsevier in "Catalysis Today, 423", available at: https://doi.org/10.1016/j.cattod.2023.01.021
dc.descriptionEste es el manuscrito aceptado del artículo publicado por Elsevier en "Catalysis Today, 423", disponible en línea: https://doi.org/10.1016/j.cattod.2023.01.021
dc.description.abstractTransition metal (TM)-carbon aerogels, where TM = Mo, Fe, Co or Cu, were found to be active and selective catalysts for the synthesis of quinoxalines 1, from o-phenylenediamine 2 and α-hydroxy ketones 3, becoming an efficient and sustainable alternative to other carbon-based catalysts or even MOF. Doping metal phase consisting of the corresponding metal oxides but also as zero-valent metals depending on the metal and carbonization temperature, and metal loading at the surface of carbon aerogel are key factors conditioning both reactivity and selectivity. Although metal oxides are probably the predominant active catalytic species, zero-valent metals nanoparticles (Cu0 or Co0) could be implied in the last dehydrogenation step of the reaction. Moreover, the additional functionalization with oxygenated surface groups (Co-1000PO catalyst) resulted on an enhanced reactivity probably due to the cooperation between both functions. Remarkably, Mo-500 catalyst was the most efficient sample selectively leading to the quinoxaline 1a in high conversion. Finally, our results strongly suggest different operative pathways when using TM-doped carbon aerogels depending on the metallic phase at the carbon surface. While TM-doped carbon aerogels (where TM = Fe, Co, or Cu) probably act catalyzing a sequential acid-base steps and subsequent aromatization leading to the corresponding quinoxaline 1a, Mo-doped catalyst would work via the initial oxidation of α-hydroxy ketones followed by condensation-dehydration reactions.en
dc.description.versionversión final
dc.identifier.citationGodino-Ojer, M., Morales-Torres, S., Maldonado-Hódar, F. J., & Pérez-Mayoral, E. (2023). Towards selective synthesis of quinoxalines by using transition metals-doped carbon aerogels. Catalysis Today, 423. https://doi.org/10.1016/j.cattod.2023.01.021
dc.identifier.doihttps://doi.org/10.1016/j.cattod.2023.01.021
dc.identifier.issn0920-5861 | eISSN 1873-4308
dc.identifier.urihttps://hdl.handle.net/20.500.14468/26298
dc.journal.titleCatalysis Today
dc.journal.volume423
dc.language.isoen
dc.publisherElsevier
dc.relation.centerFacultad de Ciencias
dc.relation.departmentQuímica Inorgánica y Química Técnica
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject23 Química
dc.subject.keywordsTransition metalsen
dc.subject.keywordscarbon aerogelsen
dc.subject.keywordsheterogeneous catalysisen
dc.subject.keywordsfine chemicalsen
dc.titleTowards selective synthesis of quinoxalines by using transition metals-doped carbon aerogelsen
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dc.typejournal articleen
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relation.isAuthorOfPublicationa0e31477-6806-4f00-afdc-90c4136f232e
relation.isAuthorOfPublication.latestForDiscoverya0e31477-6806-4f00-afdc-90c4136f232e
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