期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2014, 期 28, 页码 6242-6251出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201402649
关键词
Heterogeneous catalysis; Supported catalysts; Sol-gel processes; Rhodium; Cycloaddition; Carbenes
资金
- Spanish Ministerio de Ciencia e Innovacion (MICINN) [CTQ2011-23121, CTQ2009-07881, CTQ2012-32436, CTQ2011-22649, CSD2007-00006]
- Generalitat de Catalunya [2009SGR637, 2009SGR1441]
- Universitat Autonoma de Barcelona
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.
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