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

Daniel Mendoza-Espinosa; David Rendón-Nava; Alejandro Alvarez-Hernández; Deyanira Angeles-Beltrán; Guillermo E Negrón-Silva; Oscar R Suárez-Castillo

doi:10.1002/asia.201601499

Visible-Light-Promoted Au^I to Au^III Oxidation in Triazol-5-ylidene Complexes

Chem Asian J. 2017 Jan 17;12(2):203-207. doi: 10.1002/asia.201601499. Epub 2016 Dec 8.

Authors

Daniel Mendoza-Espinosa¹, David Rendón-Nava¹, Alejandro Alvarez-Hernández², Deyanira Angeles-Beltrán¹, Guillermo E Negrón-Silva¹, Oscar R Suárez-Castillo²

Affiliations

¹ Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-Azcapotzalco, Avenida San Pablo No. 180, Cuidad de México, 02200, México.
² Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, Mineral de la Reforma, Hidalgo, 42090, México.

PMID: 27880035
DOI: 10.1002/asia.201601499

Abstract

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 Au^I and Au^III complex series were tested in the catalytic hydrohydrazination of terminal alkynes using hydrazine as nitrogen source.

Keywords: alkynes; gold(I); gold(III); hydrohydrazination; mesoionic carbenes; oxidation.