Synthesis, reactivity, and electrochemical studies of gold(I) and gold(III) complexes supported by N-heterocyclic carbenes and their application in catalysis

• Verfasst von: Pažický, Marek [VerfasserIn]
• Verfasst von: Loos, Annette [VerfasserIn]
• Verfasst von: Ferreira, Maria João Gomes [VerfasserIn]
• Verfasst von: Serra, Daniel [VerfasserIn]
• Verfasst von: Vinokurov, Nikolai [VerfasserIn]
• Verfasst von: Rominger, Frank [VerfasserIn]
• Verfasst von: Jäkel, Christoph [VerfasserIn]
• Verfasst von: Hashmi, A. Stephen K. [VerfasserIn]
• Verfasst von: Limbach, Michael [VerfasserIn]
• Titel: Synthesis, reactivity, and electrochemical studies of gold(I) and gold(III) complexes supported by N-heterocyclic carbenes and their application in catalysis
• Verf.angabe: Marek Pažický, Annette Loos, Maria João Ferreira, Daniel Serra, Nikolai Vinokurov, Frank Rominger, Christoph Jäkel, A. Stephen K. Hashmi, and Michael Limbach
• E-Jahr: 2010
• Jahr: September 21, 2010
• Umfang: 11 S.
• Fussnoten: Gesehen am 28.06.2023
• Titel Quelle: Enthalten in: Organometallics
• Ort Quelle: Washington, DC : ACS Publ., 1982
• Jahr Quelle: 2010
• Band/Heft Quelle: 29(2010), 20, Seite 4448-4458
• ISSN Quelle: 1520-6041
• DOI: doi:10.1021/om1005484
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1851182314

Abstract

In the present study we describe the efficient synthesis of various Au(I) complexes supported by NHC ligands. Some of these ligands have a pendant pyridine arm that is linked with various tethers (CH2)n to the NHC backbone (n = 0−2). The chloride in the Au(I) complexes is easily and cleanly replaced by an aryl group upon reaction with an aryl-Grignard reagent. The thus obtained aryl Au(I) complexes are cleanly oxidized to the corresponding Au(III) complexes with phenyliodoso dichloride, as are the corresponding halide Au(I) complexes. The attempted salt metathesis with the parent Au(III) complex led to the oxidative coupling of the aryl residues with formation of the Au(I) complex. Some of the complexes are promising catalysts in the cycloisomerization of an ω-alkynylfuran to isobenzofuranol in the presence of a silver salt. For those precursors with pendant pyridine arms, a cationic dimeric Au complex was isolated and characterized, which represents a catalyst resting state and forms under reaction conditions.