P-Sulfonic acid calix[4]arene-functionalized alkyl-bridged organosilica in esterification reactions

Two new p-sulfonic acid calix[4]arene- and p-sulfonic acid calix[6]arene-functionalized organosilica have been synthesized using a sol-gel method and applied as heterogeneous catalysts in esterification reactions. The catalytic performance was evaluated using the esterification of carboxylic acids w...

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Detalhes bibliográficos
Autores: De Assis, J. V., Abranches, P. A. S., Braga, I. B., Portilla Zúñiga, Omar Miguel, Sathicq, Angel Gabriel, Romanelli, Gustavo Pablo, Sato, A. G., Fernandes, S. A.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/180976
Acesso em linha:http://hdl.handle.net/11336/180976
Access Level:acceso abierto
Palavra-chave:ESTERIFICATION REACTIONS
P-SULFONIC ACID CALIX[4]-ARENE
calix[6]arene-functionalized organosilica
sol-gel method
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
Descrição
Resumo:Two new p-sulfonic acid calix[4]arene- and p-sulfonic acid calix[6]arene-functionalized organosilica have been synthesized using a sol-gel method and applied as heterogeneous catalysts in esterification reactions. The catalytic performance was evaluated using the esterification of carboxylic acids with ethanol, and good catalytic activity (i.e., 55-88%) was observed under the optimum reaction conditions. This study reports the first promising example of the successful employment of calix[n]arenes as a heterogeneous catalyst for catalytic esterification. The catalyst was easily separated by filtration and reused five times without any significant loss of activity.

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