作者:Jie-Ping Shi、De-Lin Wu、Yong Ding、Dong-Hua Wu、Hong-Wen Hu、Guo-Yuan Lu
DOI:10.1016/j.tet.2012.02.014
日期:2012.4
A series of H-shaped chromophores with two parallel and non-conjugated D-π-A units have been synthesized, in which a 9,10-dihydroanthracene was employed as molecular backbone. The synthesis of these H-shaped chromophores 9a–11a was accomplished via an eight-step reaction, including double Claisen rearrangement, hydroboration–oxidation, Rieche formylation reaction, Knoevenagel condensation and Corey–Fuchs
合成了一系列具有两个平行且非共轭的D-π-A单元的H形发色团,其中9,10-二氢蒽被用作分子骨架。这些H形生色团9a - 11a的合成是通过八步反应完成的,包括双重克莱森重排,硼氢化-氧化,里氏甲酰化反应,Knoevenagel缩合反应和Corey-Fuchs反应,总收率约为12.5%。为了比较,也以类似的方法制备了相应的单-D-π-A单元化合物9b - 11b。三种中间体5a,7a和8a的晶体结构进行了测定,结果表明单个H形生色团分子中的两个D-π-A单元几乎以相同的方向排列。紫外可见光谱和溶剂变色方法的研究表明,与相应的单-D-π-A单元参比化合物相比,H形生色团的分子二阶极化率值(μβ)显着增加。吸收带移动到更长的波长。