2026-04-13T02:51:29Zhttps://recercat.cat/oai/requestoai:recercat.cat:10256/113332024-06-18T13:49:17Zcom_2072_452955com_2072_2054col_2072_453073
RECERCAT
author
Fernández Wang, Martí
author
Ferré Romeu, Meritxell
author
Pla i Quintana, Anna
author
Parella Coll, Teodor
author
Pleixats, Roser
author
Roglans i Ribas, Anna
2024-06-18T13:49:17Z
2024-06-18T13:49:17Z
2014
http://hdl.handle.net/10256/11333
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 describedFinancial 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
Tots els drets reservats info:eu-repo/semantics/openAccess
Catàlisi heterogènia
Heterogeneous catalysis
Catalitzadors de rodi
Rhodium catalyst
Reaccions d'addició
Addition reactions
Rodi
Rhodium
Ciclització (Química)
Ring formation (Chemistry)
Rhodium-NHC Hybrid Silica Materials as Recyclable Catalysts for [2+2+2] Cycloaddition Reactions of Alkynes
info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion