Zwitterionic Ladder Stilbenes with Phosphonium and Borate Bridges: Intramolecular Cascade Cyclization and Structure–Photophysical Properties Relationship
作者:Aiko Fukazawa、Eriko Yamaguchi、Emi Ito、Hiroshi Yamada、Jian Wang、Stephan Irle、Shigehiro Yamaguchi
DOI:10.1021/om200453w
日期:2011.7.25
The synthesis and properties of the phosphonium- and borate-bridged stilbenes are reported. The zwitterionic ladder stilbenes were synthesized by the intramolecular cascade cyclization from the phosphanyl- and boryl-substituted diphenylacetylenes 1. The study of the substituent effects of the phosphanyl and boryl groups revealed the significant dependence of the reactivity on both the nucleophilicity
据报道phospho和硼酸酯桥联的对苯二甲酸酯的合成和性质。通过分子内的级联环化反应,从膦酰基和硼基取代的二苯基乙炔1合成两性离子梯形斯蒂芬苯酯。对膦基和硼基的取代基作用的研究表明,反应性对膦基的亲核性和硼基的亲电子性均具有显着的依赖性。理论计算表明,该反应是由膦基的亲核攻击引发的,而与硼基的亲电程度无关,这与受挫的R 3 P和B(C 6F 5)3。而且,即使在化合物1c在热条件下不进行级联环化的情况下,光激发也促进了环化以产生相应的两性离子二苯乙烯2c,表明其潜在地用作光响应性材料。一系列两性离子对苯二酚2a - e的光物理性质也显示出对取代基的依赖性。荧光量子产率(Φ ˚F的芪的)图2d和2e中,具有吸电子基团diarylboryl,均幅度比的高一个数量级2A - Ç,带有一个二聚异戊二烯基。时间分辨荧光光谱法以及Φ的测量˚F在聚合物基质显示,该吸电子基团diarylboryl延迟显著