Photochemistry of diastereomeric 2,4-diphenylpentan-3-ones and related ketones in "super-cage" environments provided by micelles, porous glass, and porous silica: temperature and magnetic field effects
作者:Bruce H. Baretz、Nicholas J. Turro
DOI:10.1021/ja00343a039
日期:1983.3
temperature effects (in the range 25 to -77 "C) on the product of DPP are small for photolysis in homogeneous solution, substantial variations in product ratios with variation in temperature can be achieved when the photolyses are conducted in super-cage environments. Similarly, although magnetic field effects on the product distributions are negligibly small for photolysis in homogeneous solutions, significant
2,4-diphenylpentan-3-one (DPP)、1,3,4-triphenylbutan-2-one (TPB) 和 1,3-diphenylbutan-2- 的内消旋和 d,l 异构体的光化学一种(a-MeDBK)已在均质溶剂和“超级笼”环境中进行了研究,这些环境对双自由基对的组分的扩散位移施加了限制,从而提高了双自由基对笼反应的效率。含有胶束、多孔玻璃和多孔二氧化硅的离子去污剂溶液提供了这种超笼环境的例子。DPP 在戊烷或苯中光解的主要反应过程是脱羰,然后是 PhCHCH3 自由基的偶联 (-93%) 或歧化 (N 3%)。在超笼环境中,歧化程度显着增加,非对映异构体相互转化也是如此。C) DPP 的产物在均相溶液中的光解作用很小,当在超笼环境中进行光解时,随着温度的变化,产物比的显着变化可以实现。类似地,尽管磁场对均匀溶液中光解的产物分布的影响小到可以忽略不计,但发现在超级笼环境中