Synthesis of a Polycyclic π-Conjugated System Containing an Azulene Unit by the Flash Vacuum Pyrolytic Method. III. Synthesis and Properties of 4-Hydroxy-3<i>H</i>-cyclopent[<i>a</i>]azulen-3-one
作者:Yoichiro Kitamori、Masafumi Yasunami、Takanori Hioki、Kahei Takase、Masaaki Yoshifuji
DOI:10.1246/bcsj.65.3282
日期:1992.12
4-Hydroxy-3H-cyclopent[a]azulen-3-one, a new tricyclic π-conjugated system containing a hydroxyazulene unit and a cyclopentadienone moiety, was synthesized by the application of flash vacuum pyrolysis in the final step. All the proton magnetic resonances of the compound shifted up-field compared with those of the referenced 1,2-dihydro compound in terms of an induced paramagnetic ring current in the periphery of this molecule. The characteristic prototropic tautomerization of 4-hydroxyazulenes was not observed in this system.
一种新型三环π共轭体系化合物4-羟基-3H-环戊[a]氮杂卓-3-酮,包含一个羟基氮杂卓单元和一个环戊二烯酮部分,其最终通过闪速真空热解法合成。与参考的1,2-二氢化合物相比,该化合物所有质子的核磁共振谱线均向上场偏移,表明分子外围存在诱导的顺磁性环流。该体系并未观察到4-羟基氮杂卓的典型质子转移互变异构现象。