Mechanism of the Triplet-Sensitized Photolysis of 1-[1-(1-Naphthyl)ethoxy]-2-pyridone and Related Derivatives
作者:Tadamitsu Sakurai、Asako Watanabe、Maya Matsushita、Aya Masuda、Tetsutaro Igarashi
DOI:10.3987/com-09-11756
日期:——
2-methoxypyridine in addition to the expected N―O bond cleavage products: 1-arylethanol, arylmethylketone, and 2-pyridone. A comparison of the quantum yields for the benzophenone-sensitized photolysis of 1 with those for the direct photolysis with 313 nm light led us to conclude that the former cleavage products were derived from the methyl shift in a 1-derived singlet caged radical pair, taking place in competition
在二苯甲酮存在下在 366 nm 处照射时,氮饱和乙腈中的标题 2-吡啶酮衍生物 (1) 经历敏化分解,除了预期的 N-O 键断裂产物:1-芳基乙醇外,还生成芳醛和 2-甲氧基吡啶、芳基甲基酮和 2-吡啶酮。将 1 的二苯甲酮敏化光解的量子产率与用 313 nm 光直接光解的量子产率进行比较,我们得出结论,前一种裂解产物源自 1 衍生的单线态笼状自由基对中的甲基位移,取与这对中的氢位移以及这对的重组和扩散分离竞争。我们的结论通过氘同位素对 1-芳基乙醇(“笼外”)的限制量子产率的影响得到证实。