Selective Oxidation Of Aniline Research Articles

Selective oxidation of aniline over a {Ce3}-sandwiching POM catalyst in water

The selective oxidation of aniline towards high value-added products in water is of great importance from both the elimination of aniline pollutant in water and the production of high value-added chemicals points of view. Herein, we report the synthesis and application of a {Ce3}-sandwiching germanotungstate K10Na4[Ce3(μ2-O)3(GeW9O34)2]·24H2O (1) in the selective oxidation of aniline and derivatives towards corresponding nitroso compounds in water with diluent H2O2 as the oxidant. Compound 1 has been carefully characterized by X-ray single-crystal diffraction, TG, FT-IR, PXRD, XPS, and SEM. Under optimized condition, aniline can be quantitatively converted and the selectivity towards nitrosobenzene reaches up to 86.0% without any additives. The performance comparisons of different catalysts reveal that the structural combination of oxo-cerium and oxo-tungsten facilitates the enhancement of catalytic performance.

Potential for Selective Oxidation of Aniline in Soil Washing Effluent by Active Chlorine and Testing its Practicality

Potential for Selective Oxidation of Aniline in Soil Washing Effluent by Active Chlorine and Testing its Practicality

Selective Mild Oxidation of Anilines into Nitroarenes by Catalytic Activation of Mesoporous Frameworks Linked with Gold-Loaded Mn3 O4 Nanoparticles.

This work reports the synthesis and catalytic application of mesoporous Au-loaded Mn3 O4 nanoparticle assemblies (MNAs) with different Au contents, i. e., 0.2, 0.5 and 1 wt %, towards the selective oxidation of anilines into the corresponding nitroarenes. Among common oxidants, as well as several supported gold nanoparticle platforms, Au/Mn3 O4 MNAs containing 0.5 wt % Au with an average particle size of 3-4 nm show the best catalytic performance in the presence of tert-butyl hydroperoxide (TBHP) as a mild oxidant. In all cases, the corresponding nitroarenes were isolated in high to excellent yields (85-97 %) and selectivity (>98 %) from acetonitrile or greener solvents, such as ethyl acetate, after simple flash chromatography purification. The 0.5 % Au/Mn3 O4 catalyst can be isolated and reused four times without a significant loss of its activity and can be applied successfully to a lab-scale reaction of p-toluidine (1 mmol) leading to the p-nitrotulene in 83 % yield. The presence of AuNPs on the Mn3 O4 surface enhances the catalytic activity for the formation of the desired nitroarene. A reasonable mechanism was proposed including the plausible formation of two intermediates, the corresponding N-aryl hydroxylamine and the nitrosoarene.

Selective oxidation of aniline into azoxybenzene catalyzed by Nb-peroxo@iron oxides at room temperature

Nb-peroxo@iron oxides show high selectivity and activity in aniline conversion to azoxybenzene.

Synthesis of Azoxybenzenes by Selective Oxidation of Anilines on Titanium Silicate Molecular Sieves

Synthesis of Azoxybenzenes by Selective Oxidation of Anilines on Titanium Silicate Molecular Sieves

Formation of mutagens from the aqueous reactions of ozone and anilines

Azobenzenes, azoxybenzenes and benzidines were the products of interest obtained from the aqueous reactions of anilines with ozone. The reaction mechanisms for their formation are discussed. Conditions favoring ozone decomposition and the presence of carbonate species increased the yield of these polyaromatic nitrogen compounds. Fulvic acid inhibited the formation of azobenzene without decreasing the amount of aniline degraded. The effects of pH and inorganic buffers on the formation of N-substituted polyaromatic compounds from aniline can be explained by the decomposition of ozone by OH − and OOH −, scavenging of the hydroxyl radical and suppression of ozone decomposition by carbonate species, and selective oxidation of aniline by carbonate radicals.