Rhodium-NHC Hybrid Silica Materials as Recyclable Catalysts for [2+2+2] Cycloaddition Reactions of Alkynes
dc.contributor.author
dc.date.accessioned
2015-10-19T10:23:38Z
dc.date.available
2015-10-19T10:23:38Z
dc.date.issued
2014
dc.identifier.issn
1434-193X
dc.identifier.uri
dc.description.abstract
Bis-silylated dihydroimidazolium salt 1 and monosilylated imidazolium salt 2 are transformed to (NHC)RhCl(COD) complexes 3 and 4, allowing the preparation of hybrid silica materials either by sol-gel or grafting processes. Full characterization of the materials by means of solid state NMR, N-2-sorption measurements, thermogravimetric analysis (TGA) and elemental analysis was followed by evaluation of catalytic activity in the [2+2+2] cycloaddition of alkynes. Excellent yields of the cycloadducts are obtained for up to six consecutive cycles with the grafted material, using simple filtration to recover the catalyst. Both conventional and microwave heating prove effective for the process described
dc.description.sponsorship
Financial support from the Spanish Ministerio de Ciencia e Innovacion (MICINN) (grant numbers CTQ2011-23121, CTQ2009-07881, CTQ2012-32436, CTQ2011-22649, CSD2007-00006) and by the Generalitat de Catalunya (grant numbers 2009SGR637, 2009SGR1441, and predoctoral grant to M. Fernandez) is acknowledged. M. Ferre thanks the Universitat Autonoma de Barcelona for a predoctoral scholarship
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Wiley-VCH Verlag
dc.relation
info:eu-repo/grantAgreement/MICINN//CTQ2011-23121/ES/APLICACIONES CATALITICAS DE COMPUESTOS DE RODIO, PALADIO Y NIQUEL EN SINTESIS ORGANICA. METODOLOGIA Y ESTUDIOS MECANISTICOS./
AGAUR/2009-2014/2009 SGR-637
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Versió postprint del document publicat a: http://dx.doi.org/10.1002/ejoc.201402649
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© European Journal of Organic Chemistry, 2014, vol. 28, p. 6242-6251
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Articles publicats (D-Q)
dc.rights
Tots els drets reservats
dc.subject
dc.title
Rhodium-NHC Hybrid Silica Materials as Recyclable Catalysts for [2+2+2] Cycloaddition Reactions of Alkynes
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/openAccess
dc.embargo.terms
Cap
dc.type.version
info:eu-repo/semantics/acceptedVersion
dc.identifier.doi
dc.identifier.idgrec
021738
dc.contributor.funder
dc.relation.ProjectAcronym
dc.identifier.eissn
1099-0690