2-naphthalenedicarboxylic thioanhydride (5a) or its 2,3-isomer with alkenes in acetonitrile gave naphthothiepindiones by insertion of alkenes into C(=O)–S bond of the thioanhydride. Reactions of 5a with cis- and trans-2-butene were stereospecific, demonstrating that the insertion was caused from the singlet excited state of 5a.
用
乙腈中的烯烃照射
1,2-萘二甲酸酐 (5a) 或其 2,3-异构体,通过将烯烃插入
硫酐的 C(=O)-S 键,得到
萘硫茚二酮。5a 与顺式和反式
2-丁烯的反应是立体定向的,表明插入是由 5a 的单线激发态引起的。