New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions

Solid acid catalysts based on the direct incorporation of the vanadium Keggin heteropolyacid (PMo11V) structure during the synthesis of silica by the sol–gel technique, in acidic media using tetraethyl orthosilicate (PMo11VSiO21, PMo11VSiO22, PMo11VSiO23, and PMo11VSiO24), were prepared and characte...

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Autores principales: Palermo, Valeria, Sathicq, Ángel Gabriel, Constantieux, Thierry, Rodriguez, Jean, Vázquez, Patricia Graciela, Romanelli, Gustavo Pablo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Exactas
Química
Keggin heteropolyacids
Silica sol–gel
HPA included in silica matrix
Trifluoromethylhexahydropyrimidines
Multicomponent reaction
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/138838
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-138838
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Keggin heteropolyacids
Silica sol–gel
HPA included in silica matrix
Trifluoromethylhexahydropyrimidines
Multicomponent reaction
spellingShingle Ciencias Exactas
Química
Keggin heteropolyacids
Silica sol–gel
HPA included in silica matrix
Trifluoromethylhexahydropyrimidines
Multicomponent reaction
Palermo, Valeria
Sathicq, Ángel Gabriel
Constantieux, Thierry
Rodriguez, Jean
Vázquez, Patricia Graciela
Romanelli, Gustavo Pablo
New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
topic_facet Ciencias Exactas
Química
Keggin heteropolyacids
Silica sol–gel
HPA included in silica matrix
Trifluoromethylhexahydropyrimidines
Multicomponent reaction
description Solid acid catalysts based on the direct incorporation of the vanadium Keggin heteropolyacid (PMo11V) structure during the synthesis of silica by the sol–gel technique, in acidic media using tetraethyl orthosilicate (PMo11VSiO21, PMo11VSiO22, PMo11VSiO23, and PMo11VSiO24), were prepared and characterized by 31P-NMR, FT-IR, XRD, and textural properties (SBET). The acidic characteristics of the catalysts were determined by potentiometric titration with n-butylamine. A series of highly substituted hexahydropyrimidines were synthesized using these new materials, encapsulated in a silica framework, as catalyst in solvent-free conditions. This methodology requires short reaction time (1.5 h), a temperature of 80 °C in solvent free-conditions to obtain good to excellent yields of trifluoromethyl-hexahydropyrimidine derivatives. The Keggin catalyst embedded in the silica matrix is insoluble in polar media, which allows easy removal of the reaction products without affecting their catalytic activity.
format Articulo
Articulo
author Palermo, Valeria
Sathicq, Ángel Gabriel
Constantieux, Thierry
Rodriguez, Jean
Vázquez, Patricia Graciela
Romanelli, Gustavo Pablo
author_facet Palermo, Valeria
Sathicq, Ángel Gabriel
Constantieux, Thierry
Rodriguez, Jean
Vázquez, Patricia Graciela
Romanelli, Gustavo Pablo
author_sort Palermo, Valeria
title New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
title_short New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
title_full New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
title_fullStr New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
title_full_unstemmed New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
title_sort new vanadium keggin heteropolyacids encapsulated in a silica framework : recyclable catalysts for the synthesis of highly substituted hexahydropyrimidines under suitable conditions
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/138838
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