Selective oxidation of amines to imines or nitriles by manganese dioxide in air

초록

A simple heterogeneous system has been developed by using base treated manganese dioxide (B-MnO<inf>2</inf>) for the aerobic oxidation of amines under mild reaction conditions of 1 atm of air and 50 °C in hexane. This system was highly efficient to oxidize various kinds of primary or secondary amines including aliphatic, aromatic, and hetero-atomic ones under the applied reaction conditions. Amines were oxidized to nitriles or diimines by the self-condensation or oxidative dehydrogenation through imine intermediate. The B-MnO<inf>2</inf> was reused for at least 5 times without any loss of its catalytic performance and showed its cost effectiveness, easy workup, and easy separation of the products for achieving the protocol of green chemistry. © 2014 The Korean Society of Industrial and Engineering Chemistry. All rights reserved.

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