{"title":"二苯并[b，f]氮杂平衍生物及其反应中间体的光二聚反应","authors":"Kazuo Ashikaga, Shinzaburo Ito, Masahide Yamamoto, Yasunori Nishijima","doi":"10.1016/0047-2670(87)87027-2","DOIUrl":null,"url":null,"abstract":"<div><p>It is clearly demonstrated that the photodimerization of 5-acyl dibenz[<em>b,f</em>]azepine (DBA) derivatives occurs via excited triplet intermediates. The excited triplet state of 5-acyl DBA derivatives is barely formed on direct excitation, but is formed efficiently by triplet—triplet (T—T) energy transfer from a triplet sensitizer. Benzophenone-sensitized photoexcitation gave a unique reaction product, the <em>anti</em>-cyclobutane dimer of DBA. Under the sensitized conditions, the quantum yield for the photodimerization was estimated to be 0.15 at 25°C ([DBA]=2.0×10<sup>−3</sup> mol l<sup>−1</sup>). The triplet intermediate of this reaction was detected by nanosecond laser photolysis and the kinetic parameters of the triplet species were determined.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 321-329"},"PeriodicalIF":0.0000,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87027-2","citationCount":"4","resultStr":"{\"title\":\"Photodimerization of dibenz[b,f] azepine derivatives and their reaction intermediates\",\"authors\":\"Kazuo Ashikaga, Shinzaburo Ito, Masahide Yamamoto, Yasunori Nishijima\",\"doi\":\"10.1016/0047-2670(87)87027-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>It is clearly demonstrated that the photodimerization of 5-acyl dibenz[<em>b,f</em>]azepine (DBA) derivatives occurs via excited triplet intermediates. The excited triplet state of 5-acyl DBA derivatives is barely formed on direct excitation, but is formed efficiently by triplet—triplet (T—T) energy transfer from a triplet sensitizer. Benzophenone-sensitized photoexcitation gave a unique reaction product, the <em>anti</em>-cyclobutane dimer of DBA. Under the sensitized conditions, the quantum yield for the photodimerization was estimated to be 0.15 at 25°C ([DBA]=2.0×10<sup>−3</sup> mol l<sup>−1</sup>). The triplet intermediate of this reaction was detected by nanosecond laser photolysis and the kinetic parameters of the triplet species were determined.</p></div>\",\"PeriodicalId\":16771,\"journal\":{\"name\":\"Journal of Photochemistry\",\"volume\":\"38 \",\"pages\":\"Pages 321-329\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1987-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0047-2670(87)87027-2\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Photochemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0047267087870272\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Photochemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0047267087870272","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Photodimerization of dibenz[b,f] azepine derivatives and their reaction intermediates
It is clearly demonstrated that the photodimerization of 5-acyl dibenz[b,f]azepine (DBA) derivatives occurs via excited triplet intermediates. The excited triplet state of 5-acyl DBA derivatives is barely formed on direct excitation, but is formed efficiently by triplet—triplet (T—T) energy transfer from a triplet sensitizer. Benzophenone-sensitized photoexcitation gave a unique reaction product, the anti-cyclobutane dimer of DBA. Under the sensitized conditions, the quantum yield for the photodimerization was estimated to be 0.15 at 25°C ([DBA]=2.0×10−3 mol l−1). The triplet intermediate of this reaction was detected by nanosecond laser photolysis and the kinetic parameters of the triplet species were determined.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
