Mechanism for Photocleavage of<i>N</i>-(Anthroyloxy)-9-fluorenylideneamines and Dynamic Behavior of Anthroyloxyl Radicals
作者:Yasuo Saitoh、Makoto Kaneko、Katsunori Segawa、Hiroki Itoh、Hirochika Sakuragi
DOI:10.1246/bcsj.75.2013
日期:2002.9
derivatives takes place efficiently in acetonitrile in the excited singlet state attributed to the fluorenylidene moiety. This made it possible for the first time to directly observe anthroyloxyl radicals by the transient absorption method. The quantum efficiency for photocleavage decreases remarkably in benzene, in which the lowest excited singlet state is attributed to the anthroate moiety. All the three
N-(9-anthroyloxy)-9-fluorenylideneamine 及其 1-和 2-anthroyloxy 衍生物的 N-O 键的光裂解在乙腈中有效地发生在激发单线态的乙腈中,这归因于芴基部分。这使得首次通过瞬态吸收法直接观察蒽氧基自由基成为可能。光裂解的量子效率在苯中显着降低,其中最低激发单线态归因于无糖基团。与苯甲酰氧基和1-和2-萘甲酰氧基相比,这三种蒽酰氧基在脱羧、加成烯烃和夺取氢原子方面的反应性要低得多;9-蒽氧基自由基据推测在与α-内酯螺二氢蒽自由基平衡的同位发生分子内加成消除,