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Pàgina inicial > Articles > Articles publicats > Rhodium-NHC hybrid silica materials as recyclable catalysts for [2+2+2] cycloaddition reactions of alkynes |
Data: | 2014 |
Resum: | 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, N₂-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. |
Ajuts: | Ministerio de Ciencia e Innovación CSD2007-00006 Ministerio de Ciencia e Innovación CTQ2009-07881 Ministerio de Ciencia e Innovación CTQ2011-22649 Ministerio de Ciencia e Innovación CTQ2011-23121 Ministerio de Ciencia e Innovación CTQ2012-32436 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-637 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1441 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Heterogeneous catalysis ; Supported catalysts ; Sol-gel processes ; Rhodium ; Cycloaddition ; Carbenes |
Publicat a: | European journal of organic chemistry, Vol. 2014, Issue 28 (Aug. 2014) , p. 6242-6251, ISSN 1099-0690 |
Post-print 11 p, 666.2 KB |