Synthesis and Electron-Donor Ability of the First Conjugated π-Extended Tetrathiafulvalene Dimers
作者:Marta C. Díaz、Beatriz M. Illescas、Carlos Seoane、Nazario Martín
DOI:10.1021/jo049741z
日期:2004.6.1
A series of novel conjugated homo (16a,b) and heterodimers (20) of π-extended tetrathiafulvalenes with p-quinodimethane structures (exTTFs) linked by a conjugative vinyl spacer have been prepared by olefination Wittig−Horner reaction from the corresponding quinones (14, 19) and phosphonates (15a,b). The redox properties, determined by cyclic voltammetry, reveal a strong donor character and the presence
通过烯键化Wittig-Horner反应,由相应的醌(14)制备了一系列新的由对位乙烯基间隔基连接的具有对-喹二甲烷结构(exTTF )的π延伸的四硫富瓦烯的共轭均聚物(16a,b)和异二聚体(20)。,19)和膦酸酯(15a,b)。通过循环伏安法测定的氧化还原性质显示出强的给体特征,并且仅存在一个四电子氧化波以在与潜在单体非常相似的氧化电势值下形成四阳离子物种。理论计算(PM3)显示出一个平面的中央二苯乙烯部分和高度变形的exTTF单元。电子光谱支持以及电化学数据和理论计算,在exTTF单元之间缺乏明显的联系。