由1,6'-联苯菊烯单元组成的薁取代的供体-受体聚次甲基、双、三、和喹甘菊烯已由相应的锌盐成功制备。通过锌盐与几种胺的反应,然后与丙二腈进行克诺文格尔反应,合成了聚次甲基,以中等到高产率(40-92%)完成。同时,锌盐与仲胺的反应以及随后与环戊二烯化物离子的连续缩合环化,即所谓的齐格勒-哈夫纳法,产生了相应的1,6'-联薁烯,1,6';3,6''-分别是四萁烯和喹萁烯。通过单晶 X 射线结构分析、紫外/可见光谱、伏安分析、光谱电化学和理论揭示了薁取代的供体-受体聚次甲基、双、三和喹甘菊烯的结构、光学和电化学性质。计算。这些结果表明甘菊环上的取代基及其取代位置直接影响其反应活性、光学和电化学性能。
method for the synthesis of 1- and 2-pyridylazulenes, and of 1,3-dipyridylazulenes, is described. Color and spectral changes of these pyridylazulenes upon the addition of either acid or metal ions were investigated in detail. The color changed from blue to red upon the addition of trifluoroacetic acid or soft metal ions, depending on the substitution patterns of the pyridyl group on the azulene skeleton
The synthesis of 1,6′-biazulenes 3a and 3b and 1,6′:3,6′′-terazulenes 7a and 7b was established by one-pot reactions via the Zincke-type ring-opening of the corresponding pyridinium salts with diethylamine, followed by the reaction with cyclopentadiene in the presence of sodium methoxide. The intramolecular charge-transfer characters between azulene rings were investigated by UV–vis spectroscopy and theoretical calculations.
The synthesis of azulene-substituted polymethine dyes 3–6 was established by the Zincke-type ring-opening reaction of pyridinium salt 2 with several secondary amines, followed by the alumina-cataly...
Azulene reacts with highly electrophilic trifluoromethanesulfonates of N-containing heterocycles to give 1-dihydroheteroaryl and 1,3.-bis(dihydroheteroaryl)azulene derivatives in a good yield. Treatment of the dihydroheteroarylazulene derivatives with KOH or tert-BuOK afforded 1-heteroaryl and 1,3-bis(heteroaryl)azulenes in a good yield. (c) 2006 Elsevier Ltd. All rights reserved.