Heteroatom-Substituted Expanded Radialenes: One-Pot Synthesis and Characterization of Expanded 1,3-Dithiolane[<i>n</i>]radialenes
作者:Yu-Long Zhao、Qun Liu、Jing-Ping Zhang、Zhi-Qiang Liu
DOI:10.1021/jo050993p
日期:2005.8.1
The one-pot synthesis, crystal structure, and electronic absorption properties of expanded 1,3-dithiolan[5]radialene (6a), the first heteroatom-substituted expanded radialene molecule with dithiolanylidene groups as strongly donor termini, has been developed. Catalyzed by Ni(PPh3)2Cl2−PdCl2−CuI, radialene 6a was assembled by a highly efficient one-pot and protection-free oxidative coupling reaction
已经开发出了第一个杂原子取代的膨胀的radial烯分子,以二硫代亚萘基为强供体端基的膨胀的1,3-二硫代噻吩[5]芳烃(6a)的单锅合成,晶体结构和电子吸收性能。在Ni(PPh 3)2 Cl 2 -PdCl 2 -CuI的催化下,通过高效的一锅法和无保护的五个α-烯二炔单元的无保护氧化偶联反应组装了radial烯6a,该反应从现成的α,α-二乙炔基开始烯酮二硫缩醛(13)在温和的条件下。6a的水晶通过缓慢蒸发DMSO和丙酮溶液而获得的,表明DMSO分子在the烯6a分子腔中形成了包合物。更重要的是,由于引入了强供电子的烷硫基,全(烷硫醇化)膨胀的径向烯6a表现出极强的分子内推挽相互作用和增强的大环交叉共轭作用。