Developing strategies for the preparation of Co-carbon catalysts involved in the free solvent selective synthesis of aza-heterocycles

Godino-Ojer, M., Martín-Aranda, R.M., Maldonado-Hódar, F.J., Pérez-Cadenas, A. F. y Pérez-Mayoral, E. . (2018) Developing strategies for the preparation of Co-carbon catalysts involved in the free solvent selective synthesis of aza-heterocycles. Molecular Catalysis, Volume 445, February 2018, Pages 223-231


Título Developing strategies for the preparation of Co-carbon catalysts involved in the free solvent selective synthesis of aza-heterocycles
Autor(es) Godino-Ojer, M.
Martín-Aranda, R.M.
Maldonado-Hódar, F.J.
Pérez-Cadenas, A. F.
Pérez-Mayoral, E.
Materia(s) Química
Abstract We report herein different series of new zero valent Cobalt nanocarbons, as doped and supported aerogels, able to efficiently catalyze the reaction of 2-amino-5-chlorobenzaldehyde and -ketoesters, via Friedländer reaction. The reaction works under solvent-free and mild conditions affording yields over 80% in only 30 min of reaction time. The catalysts could be reused almost during two consecutive cycles without almost any activity loss. A comparative study between supported and doped-carbon aerogels, as catalysts highly efficient in the reaction, has allowed to stablish the relationship between the catalyst structure and the catalytic performance. At this regard, different parameters such as carbonization temperature and surface chemistry on the aerogels under study have been also explored. As a result, although the carbon matrix is involved in the reaction, the Co(0) nanoparticles on the carbon surface are the predominant active catalytic species. Oxygen functionalities on the oxidized samples in the surroundings of Co(0) nanoparticles probably prevent the access of the reagents, notably decreasing their catalytic performance.
Palabras clave Cobalt(0)-doped carbon aerogels
Nanocatalyst
Aldol-based reactions
Friedländer reaction
Editor(es) Elsevier
Fecha 2018-02
Formato application/pdf
Identificador bibliuned:DptoQIyQT-FCIE-Articulos-Rmmartin-0008
http://e-spacio.uned.es/fez/view/bibliuned:DptoQIyQT-FCIE-Articulos-Rmmartin-0008
DOI - identifier 10.1016/j.mcat.2017.11.037
ISSN - identifier 2468-8231
Nombre de la revista Molecular Catalysis
Número de Volumen 445
Página inicial 223
Página final 231
Publicado en la Revista Molecular Catalysis, Volume 445, February 2018, Pages 223-231
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/closedAccess
Tipo de acceso Acceso cerrado
Notas adicionales The registered version of this article, first published in Molecular Catalysis, is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.mcat.2017.11.037

 
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