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Heterogeneous catalytic oxidation of pyridines to N-oxides under mild conditions using tungsten-loaded TiO2

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Abstract

The heterogeneous catalytic oxidation of pyridines to pyridine N-oxides has been studied using tungsten-loaded TiO2 as the catalyst and hydrogen peroxide as the green oxidant. The catalysts were synthesized by a simple impregnation technique and characterized by X-ray powder diffraction, Raman spectroscopy, transmission electron microscopy, energy dispersion X-ray spectroscopy, X-ray photoelectron spectroscopy. The catalytic performances of the catalysts were evaluated by the N-oxidation of pyridines with 30 wt% H2O2 solution as an environmentally friendly oxidant at room temperature. These processes serve as an efficient method to prepare a variety of pyridine-N-oxides in modest to high yields, and the pyridine N-oxides could be easily separated from the heterogeneous catalytic system. This study will provide a useful strategy for preparation of heterocyclic N-oxides in the mild condition.

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Acknowledgments

The work was financially supported by the National Natural Science Foundation of China (Nos. 21401218, 51572303, 21301200), Excellent Youth Foundation of He’nan Scientific Committee (No. 134100510018), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (2013259), Henan Province Key Discipline of Applied Chemistry (201218692) and Program for Innovative Research Team (in Science and Technology) in University of Henan Province (No. 14IRTSTHN009), High Level Personnel Fund of Zhoukou Normal University (ZKNUB2013006).

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Authors and Affiliations

  1. The Key Laboratory of Rare Earth Functional Materials and Applications, Zhoukou Normal University, Zhoukou, 466001, People’s Republic of China

    Qing-Feng Li, Wen Luo & Zhenling Wang

  2. Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hong Kong, People’s Republic of China

    Wei Lu

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  1. Qing-Feng Li
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  2. Wen Luo
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  3. Wei Lu
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  4. Zhenling Wang
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Correspondence to Qing-Feng Li.

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Li, QF., Luo, W., Lu, W. et al. Heterogeneous catalytic oxidation of pyridines to N-oxides under mild conditions using tungsten-loaded TiO2 . Reac Kinet Mech Cat 119, 235–243 (2016). https://doi.org/10.1007/s11144-016-1041-6

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