Application of Radical Cation Spin Density Maps toward the Prediction of Photochemical Reactivity between <i>N</i>-Methyl-1,2,4-triazoline-3,5-dione and Substituted Benzenes
作者:Gary W. Breton、Kevin R. Hoke
DOI:10.1021/jo4001417
日期:2013.5.17
Visible light irradiation of N-methyl-1,2,4-triazoline-3,5-dione in the presence of substituted benzenes is capable of inducing substitution reactions where no reaction takes place thermally. In addition to the formation of 1-arylurazole products resulting from ring substitution, side-chain substitution occurs in some cases where benzylic hydrogens are accessible to form benzylic urazole products.
N的可见光照射在取代苯存在下的-甲基-1,2,4-三唑啉-3,5-二酮能够诱导取代反应,而没有反应会热发生。除了由于环取代而形成的1-芳基脲唑产物外,在某些情况下,在苄基氢易于形成苄基脲唑产物的情况下,还会发生侧链取代。两种类型产品的形成与最常见的中间体(自由基对)的参与最一致,该中间体是由最初形成的电荷转移络合物的光激发产生的。已经在光谱学上观察到了电荷转移复合物。此外,修改后的Rehm-Weller模型的应用表明,电子转移过程对于所有检查的基材都是可行的。大多数情况下,