Aqueous-Medium Carbon–Carbon Bond-Forming Radical Reactions Catalyzed by Excited Rhodamine B as a Metal-Free Organic Dye under Visible Light Irradiation
作者:Eito Yoshioka、Shigeru Kohtani、Takahisa Jichu、Takuya Fukazawa、Toyokazu Nagai、Akira Kawashima、Yoshiji Takemoto、Hideto Miyabe
DOI:10.1021/acs.joc.6b01102
日期:2016.8.19
radical addition–cyclization–trapping reactions under visible light irradiation. In the presence of (i-Pr)2NEt, the electron transfer from the excited rhodamine B to perfluoroalkyl iodides proceeded smoothly to promote the carbon–carbon bond-forming radical reactions in aqueous media. When i-C3F7I was employed as a radical precursor, the aqueous-medium radical reactions proceeded even in the absence of
罗丹明B作为水溶性有机光催化剂的实用性在可见光照射下的级联自由基加成-环化-捕集反应中得到了研究。在(i -Pr)2 NEt存在下,电子从激发的若丹明B转移到全氟烷基碘上可顺利进行,以促进在水性介质中形成碳-碳键的自由基反应。当将i -C 3 F 7 I用作自由基前体时,即使不存在(i -Pr)2,水-介质自由基反应也会进行网。在这些反应中,将发生罗丹明B激发单线态的直接电子转移。此外,反应性较低的i- PrI中C–I键的裂解可通过从激发的罗丹明B还原性电子转移来实现,这可以通过添加i- PrI对罗丹明B进行荧光猝灭来证实。