Synthesis and Catalytic Applications of Multinuclear Gold(I)‐1,2,3‐Triazolylidene Complexes

Abstract

A series of mono‐ to trinuclear gold(I) complexes (1–3) supported by oxo‐functionalized 1,2,3‐triazolylidenes have been prepared. All new compounds were fully characterized by means of 1H and 13C NMR spectroscopy, elemental analyses, and in the case of complexes 1 and 2 by x‐ray diffraction. The catalytic performance of the new triazolylidene gold complexes was tested in several hydroelementation and cyclization processes employing a variety of alkynes as starting materials. According to the overall results, the trinuclear complex 3 displayed the highest catalytic activity in all processes, providing good to excellent yields under mild reaction conditions.

Spotlight on Ligand Effects in 1,2,3-Triazolylidene Gold Complexes for Hydroamination Catalysis: Synthesis and Catalytic Application of an Activated MIC Gold Triflimide Complex and Various MIC Gold Chloride Complexes

“…The reaction of phenylacetylene with aniline was chosen as the model reaction (Table ). It has been shown that phenoxy- and benzoxy-linked 1,2,3-triazolylidene and ring-fused benzoxazine-derived 1,2,3-triazolylidene gold­(I) chloride complexes are potent precatalysts in this reaction. ,, In those studies a silver salt was applied as a halide scavenger. We investigated the applicability of the MIC gold complexes in a silver-free catalytic system to avoid the potential catalytic activity of the silver species or the possible interaction of the gold species with the silver salts …”

“…Due to their Lewis acidic nature, gold­(I) complexes are prone to activate alkynes, alkenes, and allenes , and have proven to be active in hydroamination reactions. ,,,− Herein we focus on the intermolecular hydroamination of alkynes through primary amines. Various gold complexes with phosphine − ,, and NHC − ligands have been studied in this regard.…”