Paper
Green Chemistry
lysts/additives has been developed by using pyridinium-based
photocatalysts. Both superoxide radical and singlet oxygen
active species were generated and collaboratively contributed
to the photocatalytic reactions with excellent efficiency and
good substrate application range from aromatic alcohols
to aliphatic analogs that are generally difficult to undergo
aerobic oxidation under mild conditions. The current metal-
free photocatalytic system has the advantages of low cost,
easy availability and high efficiency, representing an ideal
photocatalytic platform for green and economical organic
syntheses.
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6 Y. Wang, X. Wang and M. Antonietti, Angew. Chem., Int. Ed.,
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7 W. Schilling, D. Riemer, Y. Zhang, N. Hatami and S. Das,
ACS Catal., 2018, 8, 5425–5430.
8 W. Huang, B. C. Ma, H. Lu, R. Li, L. Wang, K. Landfester
and K. A. I. Zhang, ACS Catal., 2017, 7, 5438–5442.
9 K. Ohkubo, K. Suga and S. Fukuzumi, Chem. Commun.,
2006, 19, 2018–2020.
Conflicts of interest
10 N. F. Nikitas, D. I. Tzaras, I. Triandafillidi and
C. G. Kokotos, Green Chem., 2020, 22, 471–477.
11 X. Zhu, C. Liu, Y. Liu, H. Yang and H. Fu, Chem. Commun.,
2020, 56, 12443–12446.
There are no conflicts of interest to declare.
12 (a) P. M. S. Monk, The Viologens: Physicochemical Properties,
Synthesis, and Application of the Salt of 4,4′-Bipyridine,
Wiley, New York, 1998; (b) K. B. Yoon and J. K. Kochi,
J. Am. Chem. Soc., 1988, 110, 6586–6588.
13 (a) H. Lu, R. Hu, H. Bai, H. Chen, F. Lv, L. Liu, S. Wang
and H. Tian, ACS Appl. Mater. Interfaces, 2017, 9, 10355–
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251, 2753–2766.
Acknowledgements
This work was supported by grants from the National Natural
Science Foundation of China (Grant No. 21871027/21573016).
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