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.
1,6′-联
苊烯 3a 和 3b 以及 1,6′:3,6′′-三
苊烯 7a 和 7b 的合成是通过 Zincke 型环开环反应实现的,该反应通过相应的
吡啶鎓盐与
二乙胺反应,然后在
甲醇钠存在下与
环戊二烯反应。通过紫外-可见光谱和理论计算研究了
苊烯环之间的分子内电荷转移特性。