PMO-immobilized Au(I)-NHC complexes: Heterogeneous catalysts for sustainable processes
Authorsvan der Voort, Pascal
De Canck, Els
Vanden Broeck, Sofie
Nolan, Steven P.
KAUST Grant NumberOSR-2015-CCF-1974-03
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AbstractA stable Periodic Mesoporous Organosilica (PMO) with accessible sulfonic acid functionalities is prepared via a one-pot-synthesis and is used as solid support for highly active catalysts, consisting of gold(I)-N-heterocyclic carbene (NHC) complexes. The gold complexes are successfully immobilized on the nanoporous hybrid material via a straightforward acid-base reaction with the corresponding [Au(OH)(NHC)] synthon. This catalyst design strategy results in a boomerang-type catalyst, allowing the active species to detach from the surface to perform the catalysis and then to recombine with the solid after all the starting material is consumed. This boomerang behavior is assessed in the hydration of alkynes. The tested catalysts were found to be active in the latter reaction, and after an acidic work-up, the IPr*-based gold catalyst can be recovered and then reused several times without any loss in efficiency
CitationVan der Voort P, De Canck E, Nahra F, Bevernaege K, Vanden Broeck S, et al. (2017) PMO-immobilized Au(I)-NHC complexes: Heterogeneous catalysts for sustainable processes. ChemPhysChem. Available: http://dx.doi.org/10.1002/cphc.201701102.
SponsorsThe authors gratefully thank Ghent University for financial support during this research. Funda Aliç from our department is sincerely thanked for performing the elemental analysis and XRD measurements. Additionally, Bram Vanderhaeghe is acknowledged for practical assistance during the experiments. SPN thanks King Abdullah University of Science and Technology (Award No. OSR-2015-CCF-1974-03.) for support. This work was partially possible by financial support from the Research Foundation – Flanders (FWO), through Grant Number 3G006813. Umicore AG & Co. KG is gratefully acknowledged for the gift of gold salts.