作者:Lorenzo Di Terlizzi、Stefano Protti、Davide Ravelli、Maurizio Fagnoni
DOI:10.1002/chem.202200313
日期:2022.5.6
With the aim of generating new, thermally inaccessible diradicals, potentially able to induce a double-strand DNA cleavage, the photochemistry of a set of chloroaryl-substituted carboxylic acids in polar media was investigated. The photoheterolytic cleavage of the Ar-Cl bond occurred in each case to form the corresponding triplet phenyl cations. Under basic conditions, the photorelease of the chloride
为了产生新的、热难以接近的双自由基,可能能够诱导双链 DNA 切割,研究了一组氯芳基取代的羧酸在极性介质中的光化学。在每种情况下都发生 Ar-Cl 键的光异解裂解以形成相应的三重态苯基阳离子。在碱性条件下,氯阴离子的光释放伴随着从羧酸根到芳族自由基阳离子位点的分子内电子转移,形成双自由基。根据所得双自由基的稳定性,后一种中间体可能会以结构依赖的方式经历 CO2 损失,或从介质中提取氢原子。在生理 pH 值 (pH=7.3) 的水环境中,观察到苯基阳离子和双自由基化学。