Tantalum vs Niobium MCF nanocatalysts in the green synthesis of chromene derivatives

Smuszkiewicza, Agata, López-Sanza, Jesús, Sobczakb, Izabela, Martín-Aranda, Rosa M., Ziolekb, Maria y Pérez-Mayoral, Elena . (2019) Tantalum vs Niobium MCF nanocatalysts in the green synthesis of chromene derivatives. Catalysis Today, Volume 325, 15 March 2019, Pages 47-52


Título Tantalum vs Niobium MCF nanocatalysts in the green synthesis of chromene derivatives
Autor(es) Smuszkiewicza, Agata
López-Sanza, Jesús
Sobczakb, Izabela
Martín-Aranda, Rosa M.
Ziolekb, Maria
Pérez-Mayoral, Elena
Materia(s) Química
Abstract TaMCF silicas modified with alkaline metals can be considered a novel family of highly efficient bifunctional catalysts involved in the synthesis of chromene derivatives, from salicylaldehyde 2 and acetonitrile compounds, under mild conditions, showing enhanced catalytic performance than their NbMCF analogues. The observed reactivity was mainly attributed to the higher basicity of the Me/TaMCF but also the texture of the samples. The Me/TaMCF silicas showed higher Brønsted basicity than the Nb ones as indicated by the stronger interaction between alkali metals and Ta in the UV–vis and the test reaction experiments. On the other hand, the basicity of Me/TaMCF together the reactivity degree and steric hindrance of the starting acetonitriles are key factors influencing the reaction selectivity. In conclusion, the basicity of the samples plays an important role initiating the reaction by activation of nucleophile but also a compromise between alkaline cation size and basicity is required.
Palabras clave Nb and Ta mesoporous silicas
Heterogeneous catalysis
Multicomponent reactions
Chromene derivatives
Editor(es) Elsevier
Fecha 2019-03-15
Formato application/pdf
Identificador bibliuned:DptoQIyQT-FCIE-Articulos-Rmmartin-0007
http://e-spacio.uned.es/fez/view/bibliuned:DptoQIyQT-FCIE-Articulos-Rmmartin-0007
DOI - identifier 10.1016/j.cattod.2018.06.038
ISSN - identifier 1873-4308
Nombre de la revista Catalysis Today
Número de Volumen 325
Página inicial 47
Página final 52
Publicado en la Revista Catalysis Today, Volume 325, 15 March 2019, Pages 47-52
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/embargoedAccess
Tipo de acceso Acceso embargado
Notas adicionales The registered version of this article, first published in Catalisis Today, is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.cattod.2018.06.038

 
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Creado: Thu, 25 Jan 2024, 22:00:30 CET