Synthesis, Characterization and Catalytic Activity of NHC Gold(I) Polyoxometalate Complexes

Fatih Sirindil; Steven P Nolan; Samuel Dagorne; Patrick Pale; Aurélien Blanc; Pierre de Frémont

doi:10.1002/chem.201801648

Synthesis, Characterization and Catalytic Activity of NHC Gold(I) Polyoxometalate Complexes

Chemistry. 2018 Aug 27;24(48):12630-12637. doi: 10.1002/chem.201801648. Epub 2018 Jul 24.

Authors

Fatih Sirindil¹, Steven P Nolan², Samuel Dagorne³, Patrick Pale¹, Aurélien Blanc¹, Pierre de Frémont³

Affiliations

¹ Laboratoire de Synthèse, Réactivité Organique et Catalyse, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg, France.
² Department of Chemistry and Center for Sustainable Chemistry, Ghent University, Krijgslaan 281-S3, 9000, Ghent, Belgium.
³ Equipe de Synthèse, Réactivité et Catalyse Organométalliques (UMR 7177 CNRS), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg, France.

PMID: 29905978
DOI: 10.1002/chem.201801648

Abstract

The new hybrid NHC gold(I) acetonitrile polyoxometalate complexes {[Au(IPr)(MeCN)⁺ ][H⁺ ]₃ [SiW₁₂ O₄₀^4- ] (1), [Au(IPr)(MeCN)⁺ ][H⁺ ]₂ [PMo₁₂ O₄₀^3- ] (2), [Au(IPr)(MeCN)⁺ ][H⁺ ]₅ [P₂ W₁₈ O₆₂^6- ] (3), [Au(IPr)(MeCN)⁺ ][H⁺ ]₂ [PW₁₂ O₄₀^3- ] (4), [Au(IPr)(MeCN)⁺ ]₃ [PMo₁₂ O₄₀^3- ] (5) and [Au(ItBu)(MeCN)⁺ ] [H⁺ ]₂ [PMo₁₂ O₄₀^3- ] (6)} were readily synthesized in high yield and characterized by NMR and MS-ESI spectroscopy. In a preliminary catalytic study, their activity was assessed under heterogeneous conditions for the ene-yne rearrangement reaction and a cycloisomerization reaction. Additionally, their reactivity and recyclability were tested in the hydration of alkynes under homogeneous conditions.

Keywords: N-heterocyclic carbenes; carbene ligands; gold; heterogeneous catalysis; polyoxometalates.