Commercial Gold(I) and Gold(III) Compounds Supported on Carbon Materials as Greener Catalysts for the Oxidation of Alkanes and Alcohols

Abstract

Strategies are presented for single‐pot efficient oxidative functionalization of cyclohexane and alcohols, under mild conditions, catalysed by Au(I) or Au(III) compounds supported on different carbon materials with three different surface treatments. The obtained materials were tested for the oxidation of cyclohexane under mild conditions (room temperature and atmospheric pressure), using an environmentally friendly oxidant (tert‐butyl hydroperoxide, TBHP, 70 % aqueous solution). All materials were very selective to the production of cyclohexanol and cyclohexanone with no trace of by‐products detected. The catalysts were also tested in the selective oxidation of methyl benzyl alcohol, cyclohexanol, and 2‐octanol with TBHP, under microwave irradiation, to the corresponding aldehydes or ketones. In general, better results are obtained for the heterogenised complexes and that the most efficient support is CNT‐ox‐Na. This is the first report on the oxidation of C−H bonds using the mononuclear gold complexes used; only the oxidation of unsaturated units had been reported previously. The sp3‐C−H activation is much more difficult than the oxidation of unsaturated molecules with molecular oxidants.

Fe@Hierarchical BEA Zeolite Catalyst for MW-Assisted Alcohol Oxidation Reaction: A Greener Approach

“…Moreover, this simple catalytic system using only 0.1% mol of catalyst when compared to the substrate, could provide high TON values (up to ca. 600) comparing favorably to other systems reported in the literature [21][22][23][24][25].…”

“…Moreover, this simple catalytic system using only 0.1% mol of catalyst when compared to the substrate, could provide high TON values (up to ca. 600) comparing favorably to other systems reported in the literature [21][22][23][24][25]. The enhanced catalytic activity of Fe immobilized hierarchical zeolites over their parent zeolites could be related to their textural characteristics that can impose more or less important diffusional constrains to 1-phenylethanol to access the active sites.…”

The Ca2+-ATPase Inhibition Potential of Gold(I, III) Compounds

“…The compounds used are shown in Figure 1, dichloro (2-pyridinecarboxylate) gold (1) being the only gold(III) compound, the other three are gold(I) complexes. They were successfully used as catalysts in the oxidation of alkanes and alcohols in a previous work [30].…”

Sustainability in Catalytic Cyclohexane Oxidation: The Contribution of Porous Support Materials

“…Further on, in 2018, Carabineiro and co-workers reported the heterogenization of five Au(I) and Au(III) complexes ( Figure 8) on different types of carbon materials (AC, CX, and CNT), with three different surface treatments [52] as a new strategy for single-pot efficient oxidative functionalization of cyclohexane. In general, Au compounds heterogenized better on -ox-Na or -ox samples than on the bare supports.…”