Synthesis and Two-Electron Redox Behavior of Diazuleno[2,1-<i>a</i>:1,2-<i>c</i>]naphthalenes
作者:Shunji Ito、Akiko Nomura、Noboru Morita、Chizuko Kabuto、Hirokazu Kobayashi、Seiko Maejima、Kunihide Fujimori、Masafumi Yasunami
DOI:10.1021/jo020381u
日期:2002.10.1
2-c]naphthalene 6,11-bismethoxycarbonyl derivative. The redox behavior of these novel diazuleno[2,1-a:1,2-c]naphthalenes was examined by cyclic voltammetry (CV). These compounds exhibited two-step oxidation waves at +0.22 to +0.71 V upon CV, which revealed the formation of a radical cation and dication stabilized by the fused two azulene rings under the electrochemical oxidation conditions. Since the 1,2-di-2-azulenylbenzene
二-2-氮杂烯基乙炔与四苯基环戊二烯酮的狄尔斯-阿尔德反应通过假定的1,2-二苯胺的自氧化反应在一个反应釜中得到7,8,9,10-四苯基二氮杂壬并[2,1-a:1,2-c]萘-2-氮杂烯基苯衍生物。相反,双(1-甲氧基羰基-2-氮杂烯基)乙炔与四苯基环戊二烯酮的类似反应给出了1,2-二-2-氮杂烯基苯衍生物。苯衍生物与氯化铁(III)的以下环脱氢反应得到二氮杂壬并[2,1-a:1,2-c]萘6,11-双甲氧基羰基衍生物。通过循环伏安法(CV)检查了这些新型的diazuleno [2,1-a:1,2-c]萘的氧化还原行为。这些化合物在CV时在+0.22至+0.71 V时表现出两步氧化波,其揭示了在电化学氧化条件下由稠合的两个a环所稳定的自由基阳离子和阳离子的形成。由于1,2-二-2-氮杂烯基苯衍生物在较高的氧化电势下(+0.83和+1.86 V)被氧化,因此两个a环与萘的稠合增加了电子给