Synthesis of a Polycyclic π-Conjugated System Containing an Azulene Unit by the Flash Vacuum Pyrolytic Method. I. Synthesis and Properties of Cyclopent[<i>a</i>]azulenes
作者:Yoichiro Kitamori、Masafumi Yasunami、Takanori Hioki、Ikue Kikuchi、Kahei Takase
DOI:10.1246/bcsj.65.1527
日期:1992.6
1H- and 3H-cyclopent[a]azulene were synthesized in excellent yields by applying flash vacuum pyrolysis. Their structures were clearly determined. A mixture of 1H- and 3H-cyclopent[a]azulene was completely anionized with methyllithium in THF, but 67% so in ether. Although 1H-cyclopent[a]azulene reacted with dichloroketene to give a [2+2] cycloadduct, 3H-cyclopent[a]azulene reacted with cyclopentadiene
通过应用快速真空热解,1H-和3H-环戊[a]芘以优异的产率合成。它们的结构被清楚地确定。1H-和3H-环戊[a]芘的混合物在THF中用甲基锂完全阴离子化,但在乙醚中为67%。虽然 1H-环戊 [a] 芘与二氯乙烯酮反应生成 [2+2] 环加合物,但 3H-环戊 [a] 芘与环戊二烯反应生成 [4+2] 环加合物。根据 HMO 理论,这些化学行为是可预测的。