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Aerobic Oxidative Conversion of Aromatic Aldehydes to Nitriles Using a Nitroxyl/NOx Catalyst System.

The first transition-metal-free aerobic oxidative conversion of aldehyde catalyzed by a nitroxyl radical/NOx system is presented for the synthesis of nitrile. In the presence of a catalytic amount of 4-AcNH-TEMPO (4-acetamido-2,2,6,6-tetramethylpiperidine-N-oxyl), NaNO2, and HNO3, benzaldehydes bearing a variety of functional groups underwent condensation with NH4OAc and following aerobic oxidation to produce nitriles selectively under an O2 balloon. Aerobic oxidative conversion of a primary alcohol instead of aldehyde is also achieved by a one-pot sequential strategy.