Efficient imine synthesis via oxidative coupling of alcohols with amines in an air atmosphere using a mesoporous manganese–zirconium solid solution catalyst

Abstract

Mesoporous Mn1ZrxOy solid solution enables efficient imine formation from catalytic oxidative coupling of alcohols and amines at low temperature in an air atmosphere without base additives.

Tailoring the Reactive Oxygen Species in Mesoporous NiO for Selectivity-Controlled Aerobic Oxidation of 5-Hydroxymethylfurfural on a Loaded Pt Catalyst

“…3515 G (Figure 5C,D), which correspond to the typical Vöin NiO related with the nonstoichiometric oxygen species (i.e., O 2 − and O − ). 35 Moreover, the quantitative data directly confirm that the concentration of Vöin NiO increases versus aging temperature. Ni 100a displays the highest c(Vo) at 1.8 × 10 17 spins g −1 .…”

Cerium-Doped Manganese Oxide Catalyst for the Oxidative Coupling Synthesis of Fluorescent 2-Amino-1,9-dimethyl-3H-phenoxazin-3-one Using Atmospheric Oxygen

“…The desorption peaks around 100 and 600 °C can be assigned to the desorption of chemisorbed oxygen and lattice oxygen, respectively. The peaks attributed to the chemisorbed surface oxygen become much bigger after doping Ce, which implies that it has a stronger active oxygen capacity that then converts it into the chemisorbed oxygen species …”

“…The peaks attributed to the chemisorbed surface oxygen become much bigger after doping Ce, which implies that it has a stronger active oxygen capacity that then converts it into the chemisorbed oxygen species. 41 As shown in Table 3, entries 1−7, to further explore the oxidation mechanism of this reaction, comparative experiments were carried out under a N 2 atmosphere. These experiments provide evidence that cerium-doped manganese oxide catalysts show higher APXO yields than MnO y -350 under a N 2 atmosphere (Table 3, entries 1−7).…”

Catalytic selective oxidation of aromatic amines to azoxy derivatives with an ultralow loading of peroxoniobate salts

“…[24][25][26] Although oxygen is cheaper than hydrogen peroxide, it normally requires harsh reaction conditions such as elevated temperatures or high pressures to activate O 2 to participate in the selective oxidation of aromatic amines. 27 Conversely, hydrogen peroxide is a benign oxidant considering that it generates H 2 O as the only by-product and it can be activated under much milder conditions, improving the safety of the oxidation process. 28,29 Up to now, much effort has recently been devoted to the catalytic oxidation of aromatic amines to azoxy compounds on heterogeneous catalysts with H 2 O 2 .…”