Abstract
Selective oxidation of amines to imines is one of the most studied reactions in the field of heterogeneous catalysis. Cs ion-promoted mesoporous manganese oxide (meso Cs/MnOx) was synthesized using an inverse surfactant micelle as a soft template. The chemical and structural properties of the mesoporous manganese oxide material were characterized by powder X-ray diffraction, nitrogen sorption, electron microscopy, and X-ray photoelectron spectra. The meso-Cs/MnOx material presented an aggregated nanocrystalline nature with monomodal mesoporous size distributions. The catalyst was found to be effective in the oxidation of amines to imines under aerobic conditions. The meso Cs/MnOx exhibited oxidation of primary, secondary, cyclic, aromatic, and aliphatic amines to imines, and the conversions reached as high as >99%. The catalyst was also effective in oxidative cross-condensation of two different amines to produce asymmetrically substituted imines. Surface-active Mn3+ species along with labile lattice oxyge...
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