New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions
- Autores
- Palermo, Valeria; Sathicq, Ángel Gabriel; Constantieux, Thierry; Rodriguez, Jean; Vázquez, Patricia Graciela; Romanelli, Gustavo Pablo
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Centro de Investigación y Desarrollo en Ciencias Aplicadas - Materia
-
Ciencias Exactas
Química
Keggin heteropolyacids
Silica sol–gel
HPA included in silica matrix
Trifluoromethylhexahydropyrimidines
Multicomponent reaction - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/138838
Ver los metadatos del registro completo
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New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable ConditionsPalermo, ValeriaSathicq, Ángel GabrielConstantieux, ThierryRodriguez, JeanVázquez, Patricia GracielaRomanelli, Gustavo PabloCiencias ExactasQuímicaKeggin heteropolyacidsSilica sol–gelHPA included in silica matrixTrifluoromethylhexahydropyrimidinesMulticomponent reactionSolid 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.Centro de Investigación y Desarrollo en Ciencias Aplicadas2015-02-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1022-1032http://sedici.unlp.edu.ar/handle/10915/138838enginfo:eu-repo/semantics/altIdentifier/issn/1011-372xinfo:eu-repo/semantics/altIdentifier/issn/1572-879xinfo:eu-repo/semantics/altIdentifier/doi/10.1007/s10562-015-1498-3info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:31:52Zoai:sedici.unlp.edu.ar:10915/138838Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:31:52.295SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions |
title |
New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions |
spellingShingle |
New Vanadium Keggin Heteropolyacids Encapsulated in a Silica Framework : Recyclable Catalysts for the Synthesis of Highly Substituted Hexahydropyrimidines Under Suitable Conditions Palermo, Valeria Ciencias Exactas Química Keggin heteropolyacids Silica sol–gel HPA included in silica matrix Trifluoromethylhexahydropyrimidines Multicomponent reaction |
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 |
dc.creator.none.fl_str_mv |
Palermo, Valeria Sathicq, Ángel Gabriel Constantieux, Thierry Rodriguez, Jean Vázquez, Patricia Graciela Romanelli, Gustavo Pablo |
author |
Palermo, Valeria |
author_facet |
Palermo, Valeria Sathicq, Ángel Gabriel Constantieux, Thierry Rodriguez, Jean Vázquez, Patricia Graciela Romanelli, Gustavo Pablo |
author_role |
author |
author2 |
Sathicq, Ángel Gabriel Constantieux, Thierry Rodriguez, Jean Vázquez, Patricia Graciela Romanelli, Gustavo Pablo |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Ciencias Exactas Química Keggin heteropolyacids Silica sol–gel HPA included in silica matrix Trifluoromethylhexahydropyrimidines Multicomponent reaction |
topic |
Ciencias Exactas Química Keggin heteropolyacids Silica sol–gel HPA included in silica matrix Trifluoromethylhexahydropyrimidines Multicomponent reaction |
dc.description.none.fl_txt_mv |
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. Centro de Investigación y Desarrollo en Ciencias Aplicadas |
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. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-02-19 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/138838 |
url |
http://sedici.unlp.edu.ar/handle/10915/138838 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/1011-372x info:eu-repo/semantics/altIdentifier/issn/1572-879x info:eu-repo/semantics/altIdentifier/doi/10.1007/s10562-015-1498-3 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
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application/pdf 1022-1032 |
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SEDICI (UNLP) - Universidad Nacional de La Plata |
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