期刊
GREEN CHEMISTRY
卷 21, 期 6, 页码 1455-1460出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8gc03772h
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资金
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, US Department of Energy
- Shanghai Pujiang Program [17PJ1403500]
- Thousand Talent Program
- National Natural Science Foundation of China [21776174]
Metal-free oxidation, a green chemistry process, has drawn significant attention from catalysis researchers. However, most oxidation processes are completed by homogeneous metal-free catalysts, whereas heterogeneous metal-free materials have been developed with limited successes. In this study, polymerized ionic networks (PINs) with N,N-dialkyl-4,4-bipyridinium units as heterogeneous viologen type of catalysts exhibited high efficiency in the oxidation of aromatic sulfides/alcohols to sulfoxides/aldehydes, respectively (conversion: >90%, selectivity: >95%). The catalytic performance of PINs originates from the electron-accepting ability of the viologen unit, which can reduce H2O2 into an active species. Especially, the synthesis of PIN catalysts is a one-step simple polymerization reaction between benzyl bromide and bipyridine in air. The metal-free heterogeneous feature, high selectivity, mild conditions (60 degrees C, 1 h), and the facile preparation of the catalyst make the current selective oxidation approach attractive.
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