1,1-Ethylene-1H-azulenium ion and its alkyl substituted derivatives: Synthesis, characterization, and some reactions thereof
作者:Mitsunori Oda、Takanori Kajioka、Takuya Uchiyama、Kohki Nagara、Tetsuo Okujima、Shunji Ito、Noboru Morita、Toshio Sato、Ryuta Miyatake、Shigeyasu Kuroda
DOI:10.1016/s0040-4020(99)00280-x
日期:1999.5
1,1-Ethylene-1H-azulenium tetrafluoroborate (1b) and its alkyl substituted derivatives, 6-t-butyl (1c) and 4-isopropyl-3,8-dimethyl ones (1d), were synthesized starting from their corresponding azulenes by a three-step sequence which includes reduction, cyclopropanation and hydride abstraction reactions. The cation 1 b and its 6-t-butyl derivative 1c, generated in deuterated acetonitrile at −20 °C
1,1-乙烯-1H-四氟硼酸azulenium(1b)及其烷基取代的衍生物6-叔丁基(1c)和4-异丙基-3,8-二甲基(1d),是从它们各自的天青烯开始合成的:一个三步的步骤,包括还原,环丙烷化和氢化物提取反应。通过低温NMR光谱对在-20℃的氘代乙腈中生成的阳离子1b及其6-叔丁基衍生物1c进行表征。另一方面,阳离子1d被分离为稍微不稳定的绿黄色晶体。溶液中的阳离子1b在高温下经历了环丙烷环的膨胀,1 c和1 d刚分解。发现所有阳离子都易于与亲核试剂反应,从而在其环丙烷亚甲基碳原子上提供热力学控制的稳定加成产物。