Efficient one‐pot oxidative esterification of 5‐hydroxymethylfurfural (HMF) to furan‐2,5‐dimethylcarboxylate (FDMC) was achieved under extremely mild reaction conditions by using AuPd alloy nanoparticles (NPs) supported on Fe3O4. A high yield of FDMC (92 %) was obtained at room temperature under atmospheric O2. The reaction proceeded through the synergistic effects of the AuPd heterobimetallic catalyst system. The most effective molar ratio of noble metal contents for HMF oxidation was 1.00:1.18. If Au‐Fe3O4 NPs were used as the catalyst, selective synthesis of 5‐hydroxymethylfuroic acid methyl ester (HMFE) was achieved. Additionally, the AuPd‐Fe3O4 catalyst could be successfully reused.
Bimetallic catalysts are gaining attention due to their characteristics of promoting reactivity and selectivity in catalyzed reactions. Herein, a new catalytic N-formylation of secondary amines using AuPd–Fe3O4 at room temperature is reported. Methanol was utilized as the formyl source and 1.0 atm of O2 gas served as an external oxidant. The bimetallic catalyst, consisting of Au and Pd, makes the reaction more efficient than that using each metal separately. In addition, the catalyst can be effectively recycled owing to the Fe3O4 support.
We have developed a new catalytic method for the one-pot, cascade synthesis of unsymmetrical secondary amines via the reductive amination of aryl nitriles with nitroalkanes using a PdPt–Fe3O4 nanoparticle (NP) catalyst.
We established a novel heterogeneous catalytic system for the semi‐hydrogenation of diphenylacetylene through hydrogen transfer from biomass as an abundant and cheap hydrogen source using a bimetallic PdCuFe3O4 nanoparticle catalyst. A wide range of carbohydrates from biomass sources were successfully utilized in the selective semi‐hydrogenation of diphenylacethylene in 2‐butanone/water.
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