Visible‐Light‐Promoted AuI to AuIII Oxidation in Triazol‐5‐ylidene Complexes

• Published in: Chemistry, an Asian journal Vol. 12; no. 2; pp. 203 - 207
• Main Authors: Mendoza‐Espinosa, Daniel, Rendón‐Nava, David, Alvarez‐Hernández, Alejandro, Angeles‐Beltrán, Deyanira, Negrón‐Silva, Guillermo E., Suárez‐Castillo, Oscar R.
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 17.01.2017
• Subjects: alkynes; Chemistry; gold(I); gold(III); hydrohydrazination; mesoionic carbenes; oxidation
• ISSN: 1861-4728; 1861-471X
• DOI: 10.1002/asia.201601499

Reaction of triazolium precursors [MIC(CH2)n‐ H+]I− (n=1–3) with potassium hexamethyldisilazane (KHMDS) and AuCl(SMe2) generates the gold(I) complexes of the type MIC(CH2)n⋅AuI. Visible light exposure of the latter complexes promotes a spontaneous disproportionation process rendering gold(III) complexes of the type [{MIC(CH2)n}2⋅AuI2]+I−. Both the AuI and AuIII complex series were tested in the catalytic hydrohydrazination of terminal alkynes using hydrazine as nitrogen source. A good promotion: The visible‐light‐promoted disproportionation of AuI complexes (4) which produces AuIII complexes of type 5 is reported. Both the AuI and AuIII series were tested in the hydrohydrazination of terminal alkynes using hydrazine as nitrogen source.