reaction from the singlet. The rearrangement 12a→14a-c proceeds along three reaction paths evolving from the two primary photochemical processes of naphthyl-vinyl and vinyl-vinyl bonding in β-position to the CO (12→25+29). Two ground-state triplet diradical intermediates such as 25 and 27 have been shown to intervene consecutively—for the first time in di-π-methane photochemistry. Each has been characterized
8-苯甲酰基-9-
氘代
萘并[ de -2.3.4]双环[3.2.2] nona-2,6,8-
三烯(12a)在光
化学二-π-
甲烷类型过程中重排为l-苯并
吡咯[ de- [2.3.4] tricyclo [4.3.0.0 2,9 ] nona-3,7-dienes 14a-c。二氢衍
生物13a和羟基苯甲酰甲基类似物21a和22a进行类似的区域选择性重排,形成15a + c,23a-c,和24a。在298 K时,主要的光反应直接来自S 1(n,π *)和T 2(n,π *))状态,它直接或通过T 2从T 1(π,π *)和S 2(π,π *)进行。在较低温度下直接照射。S 1 →T系统间交叉和三重态反应与来自单重态的反应竞争。重排12a → 14a-c沿着三个反应路径进行,该反应路径从在β位的
萘-
乙烯基和
乙烯基-
乙烯基键合到CO(12 → 25 + 29)的两个主要光
化学过程演变而来。两个基态三