Journal
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
Volume 92, Issue 9, Pages 1467-1473Publisher
CHEMICAL SOC JAPAN
DOI: 10.1246/bcsj.20190117
Keywords
[2+2] Photocycloaddition; Flow microreactor; Slug flow
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [25870437, JP16H04333, 24310101, JP15H03544]
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) [JP18H04414]
- NAIST Presidential Special Fund
- JKA
- KEIRIN RACE
- Grants-in-Aid for Scientific Research [25870437] Funding Source: KAKEN
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In this work, the [2+2] photocycloaddition of carbonyl compounds with olefins, the Paterno-Biichi-type photoreaction, was performed in a flow microreactor under slug flow (two-phase flow) conditions which are constructed by alternatively introducing nitrogen gas as an unreactive substance into the organic reaction phase. The use of N-2 gas-liquid slug flow conditions permitted the organic photoreactions to proceed more efficiently compared to one-phase flow conditions. A detailed investigation of the influence of the flow mode, the viscosity of the solvents, and the segment length (length of each phase) on the efficiency of the photoreaction was conducted. Based on the results, we concluded that these three factors contribute to the improvement in photoreaction efficiency under slug flow conditions using N-2 gas as an unreactive substance. Further- more, the use of N-2 gas as an unreactive substance was found to be applicable to other Paterno-Biichi-type photoreactions.
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