Abstract
All-in-one: supported nanoalloys as efficient heterogeneous catalysts for the one-pot synthesis of imines and secondary amines directly from nitrobenzene and benzylic alcohols using a hydrogen auto transfer strategy.
Highlights
Sankar et al reported an excess anion modification of the CIm method (the modified impregnation (MIm) method) for the synthesis of supported gold–palladium nanoalloys, which affords a more precise control over size, composition and morphology.[8]
Supported gold–palladium and ruthenium–palladium bimetallic catalysts were prepared by a modified impregnation (MIm) method
These catalysts were found to be exceptionally active for the direct synthesis of imines and secondary amines from nitroarenes and aromatic alcohols without using any hydrogen, sacrificial hydrogen donor and/or base using a hydrogen auto transfer strategy
Summary
Sankar et al reported an excess anion modification of the CIm method (the modified impregnation (MIm) method) for the synthesis of supported gold–palladium nanoalloys, which affords a more precise control over size, composition and morphology.[8]. Sankar et al have reported that, for the oxidative dehydrogenation of 1, TiO2-supported Au–Pd nano-alloys catalyse an unwanted disproportionation reaction, resulting in the production of toluene and benzaldehyde, besides the desired dehydrogenation reaction to form benzaldehyde.[23] It was further reported that MgO-supported gold–palladium catalysts exclusively favour the dehydrogenation reaction by switching-off the disproportionation reaction.[23] A 1% AuPd/ MgO (MIm) catalyst was tested for the current hydrogen auto-transfer reaction, but was found to have a much lower activity (23% conversion) compared to the TiO2supported catalyst (99% conversion).
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