Dual Catalysis with an Ir^III–Au^I Heterodimetallic Complex: Reduction of Nitroarenes by Transfer Hydrogenation using Primary Alcohols

Abstract

A triazolyl‐di‐ylidene ligand has been used for the preparation of a homodimetallic complex of gold, and a heterodimetallic compound of gold and iridium. Both complexes have been fully characterized and their molecular structures have been determined by means of X‐ray diffraction. The catalytic properties of these two complexes have been evaluated in the reduction of nitroarenes by transfer hydrogenation using primary alcohols. The two complexes afford different reaction products; whereas the AuI–AuI catalyst yields a hydroxylamine, the IrIII–AuI complex facilitates the formation of an imine.

Carbon-catalysed reductive hydrogen atom transfer reactions

“…As discussed above, in the reductive hydrogen atom transfer reactions, there are two classical reactions, that is, transfer hydrogenation of nitro compounds [62][63][64] and carbonyl group reduction [65][66][67] . In addition, it has been shown that carbon can function as an active catalyst for nitrobenzene reduction with hydrazine as the hydrogen source 33 .…”

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

“…Figure 2 shows the complexes under study in this work. All three complexes were obtained from 1,2,4-trimethyl-triazolium tetrafluoroborate, following similar synthetic procedures as those that we have previously reported [33][34][35][36][37][38][39] . The preparation of the Pd-Ru heterodimetallic complex 3 was achieved by the stepwise deprotonation of the triazolium salt, followed by the subsequent addition of the corresponding metal source, as schematically shown in Fig.…”

“…1) [33][34][35][36][37][38][39] . The preparation of such types of heterodimetallic complexes allowed us to study several catalytic processes in which each metal fragment facilitated a mechanistically different cycle 33,35,36,40 .…”

Trinuclear Heterobimetallic Complexes by Stepwise Metalation of a Macrocyclic Tetraimidazolium Salt

“…[15] In most cases, heterobimetallic NHC complexes were prepared by stepwise metalation of suitable ligand precursors [14][15][16] to yield complexes of types C [14,15a-15c] and D [15d] (Figure 2). Recently, the single-step, site-selective metalation of a tricarbene ligand leading to complex E was also reported.…”

“…NHCs have been extensively used as spectator ligands in catalytically active transition-metal complexes, [13] and heterobimetallic complexes derived from a poly-NHC scaffold have already found applications in cooperative [14] and tandem catalysis. [15] In most cases, heterobimetallic NHC complexes were prepared by stepwise metalation of suitable ligand precursors [14][15][16] to yield complexes of types C [14,15a-15c] and D [15d] (Figure 2).…”