Photoinduced Reactions of Chloranil with 1,1-Diarylethenes and Product PhotochemistryIntramolecular [2 + 2] (Ortho-)Cycloadditions of Excited Enedione's CC Double Bond with Substituted Benzene Ring
作者:Jie Xue、Jian-Wei Xu、Li Yang、Jian-Hua Xu
DOI:10.1021/jo990831r
日期:2000.1.1
Photoinduced reactions of chloranil (CA) with 1,1-diarylethenes 1 [(p-X-Ph)(2)C=CH(2), X = F, Cl, H, Me] in benzene afforded products 4-14, respectively, with the bicyclo[4.2.0]oct-3-ene-2,5-diones 4, the 6-diarylethenylcyclohexa-2,5-diene-1,4-diones 5, and 2,3,5, 6-tetrachlorohydroquinone 13 as the major primary products. The cyclobutane products 4 are formed via a triplet diradical intermediate without
苯甲酰氯(CA)与1,1-二芳烃1 [(pX-Ph)(2)C = CH(2),X = F,Cl,H,Me]在苯中的光诱导反应分别得到产物4-14,与双环[4.2.0] oct-3-ene-2,5-diones 4、6-diarylethenylcyclohexa-2,5-diene-1,4-diones 5和2,3,5,6-四氯氢醌13作为主要的主要产品。环丁烷产物4是通过三重双自由基中间体形成的,而没有涉及两个反应物之间的单电子转移(SET),而5则衍生自具有(3)CA与烯烃之间的初始SET相互作用的反应序列。9-芳基菲-1,4-二酮6及其10-羟基衍生物7是衍生自5的次级光化学产物。异构体笼产物9-11由4经由三重激发二烯键体部分诱导的分子内苯-烯烃[2 + 2](邻)光环加成反应形成。两组产品的相对数量(通过非SET路线的4个及其次级产品9-11与通过SET路线的5个及其次级产品6、