Synthesis of a Polycyclic .PI.-Conjugated System Containing an Azulene Unit by the Flash Vacuum Pyrolytic Method. IV. Synthesis and Properties of 1-Isopropylidene-1H- and 3-Isopropylidene-3H-cyclopent(a)azulene.
摘要:
在碱催化下,1H-环戊并[a]氮烯与丙酮缩合,合成了一种新的π-共轭体系--1-异亚丙基-1H-环戊并[a]氮烯。通过 3H-环戊并[a]氮烯-3-酮与二甲基乙烯的反应,还合成了异构体 3-异亚丙基-3H-环戊并[a]氮烯。光谱数据显示,富烯的缩合并没有扰乱薁分子的性质。对 3-isopropylidene-3H-cyclopent[a]azulene 的 X 射线分析也表明,这种 π 共轭体系是一种受融合富烯环轻微扰动的薁分子。
Synthesis of a Polycyclic .PI.-Conjugated System Containing an Azulene Unit by the Flash Vacuum Pyrolytic Method. IV. Synthesis and Properties of 1-Isopropylidene-1H- and 3-Isopropylidene-3H-cyclopent(a)azulene.
A new π-conjugated system, 1-isopropylidene-1H-cyclopent[a]azulene was synthesized by the base-catalyzed condensation of 1H-cyclopent[a]azulene with acetone. An isomeric 3-isopropylidene-3H-cyclopent[a]azulene was also synthesized by the reaction of 3H-cyclopent[a]azulen-3-one with dimethylketene. The condensation of fulvene did not perturb the properties of the azulene moiety as shown by the spectral data. The X-ray analysis of 3-isopropylidene-3H-cyclopent[a]azulene also indicated that this π-conjugated system was an azulene moiety slightly perturbed by the fused fulvene ring.
在碱催化下,1H-环戊并[a]氮烯与丙酮缩合,合成了一种新的π-共轭体系--1-异亚丙基-1H-环戊并[a]氮烯。通过 3H-环戊并[a]氮烯-3-酮与二甲基乙烯的反应,还合成了异构体 3-异亚丙基-3H-环戊并[a]氮烯。光谱数据显示,富烯的缩合并没有扰乱薁分子的性质。对 3-isopropylidene-3H-cyclopent[a]azulene 的 X 射线分析也表明,这种 π 共轭体系是一种受融合富烯环轻微扰动的薁分子。
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
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