Gold complexes were prepared and investigated as catalysts for the oxidative esterification of aldehydes. Stabilisation by pyridine ligands gave good conversions and the in situ extended X-ray absorption fine structure (EXAFS) study of the reactions indicated that the reaction mixtures contained only mononuclear gold species. Thus, this is the first proof for a homogeneous gold-catalysed oxidation reaction; the presence of nanoparticles could be excluded experimentally.
Gold and Palladium Combined for Cross-Coupling. -Organogold(I) complexes undergo cross-coupling with aryl iodides (and bromides) in the presence of catalytic amounts of a palladium complex. The gold furanone complexes (I) exhibit an unprecedented thermal stability which allows reactions at elevated temperature. The gold can be recovered in nearly quantitative yield as iodo(triphenylphosphine)gold complex.-(HASHMI*, A. S. K.; LOTHSCHUETZ, C.; DOEPP, R.; RUDOLPH, M.; RAMAMURTHI, T. D.; ROMINGER, F.; Angew.
Substrates containing an aryl iodide and an allenoate ester undergo gold‐induced cycloisomerization to vinylgold(I) species (III) which are further converted into tricyclic product (IV) by intramolecular palladium‐catalyzed cross‐coupling reactions.
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