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Issue 39, 2013
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Gold(iii) stabilized over ionic liquids grafted on MCM-41 for highly efficient three-component coupling reactions

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Abstract

Two alkoxysilyl-modified ionic liquids (ILs) have been synthesized and further grafted onto mesoporous silica, MCM-41; these ionic liquids were used for dispersing AuCl3 catalysts that activate C–H bonds as required for the synthesis of propargylamines by coupling alkyne, aldehyde and amine (A3 coupling) species. 29Si NMR experiments demonstrate the formation of covalent bonds between alkoxysilyl-modified Bmim IL and the MCM-41 surface through silanol groups. The catalytic activities of Au(III)-supported MCM-41 and Au(III) homogeneous catalysts are lower than those obtained for the IL functionalized Au–MCM-41 solids when the same gold loading is considered. An interaction between Au(III) species and the IL is proposed for explaining the stabilization of gold(III) species. However, successive reaction cycles result in a decrease in the catalytic activity that has been explained on the basis of gold leaching.

Graphical abstract: Gold(iii) stabilized over ionic liquids grafted on MCM-41 for highly efficient three-component coupling reactions

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Article information


Submitted
12 Jul 2013
Accepted
09 Aug 2013
First published
09 Aug 2013

Phys. Chem. Chem. Phys., 2013,15, 16927-16934
Article type
Paper

Gold(III) stabilized over ionic liquids grafted on MCM-41 for highly efficient three-component coupling reactions

L. F. Bobadilla, T. Blasco and J. A. Odriozola, Phys. Chem. Chem. Phys., 2013, 15, 16927
DOI: 10.1039/C3CP52924J

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