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A microreaction system for organic photoreactions was developed, and the processes of diastereo-differentiating photosensitized reaction, photocatalytic oxidation and reduction of organic compounds, and amine N-alkylation were examined in microspace. These model reactions proceeded very rapidly with considerably large photonic efficiencies because of some distinct properties of microreactors for photoreactions, such as higher spatial illumination homogeneity and better light penetration through the entire reactor depth, and large surface-to-volume ratio in comparison with large-scale batch reactors. These results suggest feasibility of microreaction systems on organic photoreactions.

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Photocatalytic reduction of benzaldehyde and nitrotoluene in microspace was investigated by using a microreactor with immobilized titanium dioxide. Advantages of a photocatalytic microreaction system which has a remarkably large surface-to-volume ratio have been examined.

Reduction O 0220 Photocatalytic Reduction in Microreactors. -Photocatalytic reduction of benzaldehyde (I) and nitrotoluene (III) is investigated using a microreactor with immobilized TiO2. -(MATSUSHITA*, Y.; KUMADA, S.; WAKABAYASHI, K.; SAKEDA, K.; ICHIMURA, T.; Chem. Lett. 35 (2006) 4, 410-411; Dep. Chem., Tokyo Inst. Technol., Meguro, Tokyo 152, Japan; Eng.) -M. Paetzel 35-045