Electron-Transfer Chemistry and Redox-Switching of Stilbene-Like Heteroaromatic Compounds — Syntheses, Optoelectrochemical and ESR/ENDOR Studies
作者:Hubert Spreitzer、Markus Scholz、Georg Gescheidt、Jörg Daub
DOI:10.1002/jlac.199619961218
日期:1996.12
groups were employed as acceptors. The synthesis of the push-pull-substituted stilbenes 1a, 1b, 1c, 2a, 2b and 2c was achieved by Wittig coupling of the heterocyclic aldehydes with the anthraquinoyl or phenyl phosphonium salts. The diastereoisomers were separated either by chromatography or by crystallization. — The redox potentials of the (Z) and (E) isomers differ only slightly. Spectroelectrochemical
合成了其中电子供体和受体亚基通过亚乙烯基间隔基共价连接的氧化还原活性化合物,并通过循环伏安法,光谱电化学和ESR / ENDOR光谱研究了它们的性质。将10-甲基吩噻嗪基,10-甲基苯恶嗪基和苯并噻吩基用作给电子基团,而将9,10-蒽醌-2-基和苯基用作受体。推挽取代的对苯二甲酸酯1a,1b,1c,2a,2b和2c的合成是通过杂环醛与蒽醌或苯基phospho盐的Wittig偶联实现的。通过色谱法或结晶分离非对映异构体。—(Z)和(E的氧化还原电位)异构体仅略有不同。光谱电化学测量表明,吩噻嗪和吩恶嗪衍生物的自由基阳离子经历了从(Z)到(E)异构体的重排。另一方面,电子附着导致构型稳定的自由基阴离子。根据由ESR / ENDOR光谱建立的超精细数据所反映的电子分布,可以合理化这种行为。