Abstract
Ultraviolet (UV) irradiation of 2-[(2,4,6-trimethylphenoxy)methyl]-1-(methoxycarbonyl)naphthalene promotes a photochemical reaction that gives a cyclohexa-2,4-dienone product arising from a photo-Claisen-type ortho-rearrangement and a phenol derivative arising from a meta-rearrangement, along with 1-methoxycarbonyl-2-methylnaphthalene and 1,2-bis[1-(methoxycarbonyl)naphthalen-2-yl]ethane. When this process is carried out in a microreactor/flow system, its efficiency is dramatically enhanced and selectivity of products is improved. The effects on efficiency and product selectivity caused by the microreactor/flow system are attributed to more efficient light absorption and the suppression of secondary reactions.
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Acknowledgments
This work was supported in part by Grant-in-Aids for Scientific Research on Priority Areas (417) (no. 17029058) and (432) (no. 17034056), Exploratory Research (no. 16655018), and Young Scientists (B) (no. 16750039) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan.
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Maeda, H., Nashihara, S., Mukae, H. et al. Improved efficiency and product selectivity in the photo-Claisen-type rearrangement of an aryl naphthylmethyl ether using a microreactor/flow system. Res Chem Intermed 39, 301–310 (2013). https://doi.org/10.1007/s11164-012-0650-6
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DOI: https://doi.org/10.1007/s11164-012-0650-6