利用纳米反应器控制烯烃光敏氧化反应的方向

Vesicles and Nafion membranes as hosts direct photosensitized oxidation of alkenes selectively toward either the energy -transfer-mediated or the electron-transfer-mediated products by controlling the status and location of the substrate and sensitizer molecules in the reaction media. The mechanism of the photosensitized oxidation of the derivates of styrylthiophenes was found to be dependent on the position of the vinyl substituent in the thiophene ring.

烯烃的光敏氧化是一类重要反应。许多情况下同时生成单重态氧和超氧负离子氧化产物，反应选择性很低。本项目拟用分子筛孔腔、聚乙烯非晶区、Nafion反胶束作为微反应器，将底物和敏化剂隔离以阻断超氧负离子生成，单一地生成单重态氧产物。或者将底物和敏化剂同置于微反应器中，增大电子转移效率，阻止单重态氧生成，单一地生成超氧负离子氧化产物。