Abstract
A variety of substituted azoxybenzenes can be obtained by simple photoreduction of the corresponding nitrobenzene using a flow microreactor. The yield and chemoselectivity of each azoxybenzene depends on the type and position of the substituents. In addition, the use of liquid-liquid slug flow conditions, consisting of an organic solution and a fluorous solvent like tetradecafluorohexane (TDFH) or octadecafluorooctane (ODFO), improves both the conversion and yield of this photoreduction compared to those in simple one-phase flow conditions; these results are due to synergy between the very smooth photoreduction process and the highly efficient mixing obtained under continuous-flow conditions.
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Acknowledgements
The authors are grateful for special support “the Research for Advanced Core Technologies (ReACT)” for this research by the Wakayama prefecture. We would like to thank Editage (www.editage.jp) for English language editing.
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Scientific Highlights
The hydrophilicity of solvent influences the product distribution of photorecution of nitrobenzenes.
Various kinds of azoxybenzene can be obtained as a main product using only a flow microreactor.
The slug flow consisting of fluorous solvents can improve both the conversion and yield of the bimolecular photoreaction.
Supporting Information
1H- and 13C-NMR chart of each azoxybenzene obtained in this paper.
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Nishiyama, Y., Fujii, A. & Mori, H. Photoreduction synthesis of various azoxybenzenes by visible-light irradiation under continuous flow conditions. J Flow Chem 12, 71–77 (2022). https://doi.org/10.1007/s41981-021-00190-1
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DOI: https://doi.org/10.1007/s41981-021-00190-1