A pentacene intermediate via formal intramolecular photoredox of a 6,13-pentacenequinone in aqueous solution
作者:Yunyan Hou、Peter Wan
DOI:10.1139/v07-117
日期:2007.12.1
photolysis of 4 in acidic aqueous solution (pH < 3) resulted in a clean intramolecular photoredox reaction, via an enol intermediate, to give 10 (green compound; Φ ~ 0.2 at pH 1), which was too reactive for isolation or trapping by standard ArOH trapping agents such as acetic anhydride. These reactions may be viewed as a one-way photochemical intramolecular “redox switch” from quinone to hydroquinone
我们实验室发现的芳香酮在水溶液中的正式分子内光氧化还原反应(或串联光互变异构化)已扩展到许多苯醌。特别是,我们对光氧化还原反应是否可以应用于 2-(羟甲基)-6,13-并五苯醌 (4) 感兴趣,这将产生 2-甲酰基-6,13-二羟基并五苯 (10),从而提供一种合成并五苯衍生物的光化学方法。虽然许多苯并苯醌表现出一系列的光氧化还原反应性,但 4 在酸性水溶液(pH < 3)中的光解导致分子内光氧化还原反应,通过烯醇中间体,产生 10(绿色化合物;Φ ~ 0.2,pH 1 ),它的反应性太强,无法通过标准的 ArOH 捕集剂(如乙酸酐)进行分离或捕集。