Issue 39, 2013

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

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

Article information

Article type
Paper
Submitted
12 Jul 2013
Accepted
09 Aug 2013
First published
09 Aug 2013

Phys. Chem. Chem. Phys., 2013,15, 16927-16934

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements