作者:Takashi Karatsu、Akihide Kitamura、Hualing Zeng、Tatsuo Arai、Hirochika Sakuragi、Katsumi Tokumaru
DOI:10.1246/bcsj.68.920
日期:1995.3
1-styrylanthracene (1SA) undergoes adiabatic cis → trans one-way isomerization (3c* → 3t*) similarly to 2-anthrylethylenes. However, upon direct irradiation, cis-1SA in the singlet excited state mostly undergoes cyclization to a dihydrophenanthrene-type product (DHP), 4a,4b-dihydrobenzo[b]chrysene, competing with an inefficient intersystem crossing to 3c* followed by one-way isomerization. The produced DHP, in
在三线态敏化时,1-苯乙烯基蒽 (1SA) 经历绝热顺式 → 反式单向异构化 (3c* → 3t*),类似于 2-蒽基乙烯。然而,在直接照射下,处于单线激发态的 cis-1SA 主要经历环化成二氢菲型产物 (DHP),4a,4b-二氢苯并 [b] 芘,与低效的系统间交叉竞争到 3c*,然后是一个-方式异构化。在脱气苯中产生的 DHP 通过热(Ea = 14.9 kcal mol-1)或光化学途径恢复为 cis-1SA;然而,在含氧气氛下,DHP 会生成苯并 [b] 芘。在反式 1SA 激发下环化产物的生产失败表明异构化确实以单向方式发生。