Polyoxometalate-intercalated layered double hydroxides as efficient and recyclable bi-functional catalysts for cascade reactions

Liu, K., Xu, Y., Yao, Z., Miras, H.N. and Song, Y.-F. (2016) Polyoxometalate-intercalated layered double hydroxides as efficient and recyclable bi-functional catalysts for cascade reactions. ChemCatChem, 8(5), pp. 929-937. (doi: 10.1002/cctc.201501365)

Abstract

The polyoxometalate (POM) intercalated-layered double hydroxides (LDHs) have been widely used as heterogeneous catalysts. However, the application of POM-LDHs as bi-functional catalysts for cascade reaction has seldom been studied comparing with the noble metal-based catalysts. Herein, a series of POM-LDHs catalysts of Tris-LDH-X4(PW9)2 (X = Mn, Fe, Co, Ni, Cu and Zn) has been prepared; The efficacy of Tris-LDH-Zn4(PW9)2 as efficient bi-functional catalyst has been demonstrated for cascade reactions involving oxidation of benzyl alcohol to benzaldehyde followed by Knoevenagel condensation with ethyl cyanoacetate to produce benzylidene ethyl cyanoacetate. The combination of POM's redox/acidic sites and LDHs's basic sites led to a composite catalyst with excellent activity (99%) and selectivity (≥ 99%) under mild and soluble-base-free conditions. This work offer a new design strategy for the fabrication of efficient bi-functional catalysts for the promotion of one-pot cascade reactions.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Moiras, Professor Haralampos and Song, Dr Yufei
• Authors: Liu, K., Xu, Y., Yao, Z., Miras, H.N., and Song, Y.-F.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: ChemCatChem
• Publisher: Wiley
• ISSN: 1867-3880
• ISSN (Online): 1867-3899
• Copyright Holders: Copyright © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
• First Published: First published in ChemCatChem 8(5):929-937
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.