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

The new hybrid NHC gold(I) acetonitrile polyoxometalate complexes {[Au(IPr)(MeCN)(+)][H+](3)[SiW12O404-] (1), [Au(IPr)(MeCN)(+)][H+](2)[PMo12O403-] (2), [Au(IPr)(MeCN)(+)][H+](5)[P2W18O626-] (3), [Au(IPr)(MeCN)(+)][H+](2)[PW12O403-] (4), [Au(IPr)(MeCN)(+)](3)[PMo12O403-] (5) and [Au(ItBu)(MeCN)(+)] [H+](2)[PMo12O403-] (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.