Three types of micro-photoreactor setups were investigated using DMBP-sensitized additions of isopropanol to furanones as model reactions. The results were compared to experiments using a conventional batch reactor. Based on conversion rates, reactor geometries and energy efficiency calculations the microsystems showed superior performances over the batch process. Of the three micro setups examined, the LED-driven microchip gave the best overall results.
Irradiations of alkyl phenylglyoxylates with sulfur-containing carboxylates yielded the corresponding photodecarboxylative addition products in moderate to good yields of 26-58%. Reductive photodimerization competed with decarboxylative addition in all cases. The reaction protocol was successfully transferred to a microreactor. With potassium 2-(methylsulfanyl)propionate, photoadditions gave diastereomeric mixtures with low selectivity for the like-isomer.
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