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Heterogenous Viologen Catalysts for Metal-free and Selective Oxidations

Abstract

Metal-free oxidation, a green chemistry process has drawn more attention from catalysis community. However, most oxidation processes are complete by homogeneous metal-free catalysts, while heterogeneous metal-free materials have been developed with limited successes. In this work, polymerized ionic networks (PINs) with N, N'-dialkyl-4,4'-bipyridinium units as heterogeneous viologen type of catalysts exhibit high efficiency in oxidizing aromatic sulfide/alcohol to sulfoxide/aldehyde, respectively (Conv.: >90%, Sel.: >95%). The catalytic performance of PINs originates from the electron-accepting ability of viologen unit, which can reduce H2O2 into active species. Especially, the synthesis of PIN catalysts is a one-step simple polymerization between benzyl bromide and bipyridine in air. The metal-free heterogeneous feature, the high selectivity, the mild conditions (60oC, 1 h), and the facile preparation of catalyst make current selective oxidation attractive.

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Publication details

The article was received on 03 Dec 2018, accepted on 04 Feb 2019 and first published on 04 Feb 2019


Article type: Paper
DOI: 10.1039/C8GC03772H
Citation: Green Chem., 2019, Accepted Manuscript

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    Heterogenous Viologen Catalysts for Metal-free and Selective Oxidations

    S. Hou, N. Chen, P. Zhang and S. Dai, Green Chem., 2019, Accepted Manuscript , DOI: 10.1039/C8GC03772H

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