Reaction of cyclopropenylium ions with the tert-butyl-C60 anion: carbocation–carbanion coordination vs salt formation
作者:Toshikazu Kitagawa、Toru Tanaka、Hideyuki Murakita、Atsunori Nishikawa、Ken'ichi Takeuchi
DOI:10.1016/s0040-4020(01)00236-8
日期:2001.4
the tert-butyl-C60 anion (t-BuC60−) with tricyclopropylcyclopropenylium ion and 1,2-dicyclopropyl-3-(4-methylphenyl)cyclopropenylium ion underwent C–C covalent bond formation to give 1-tert-butyl-4-(2-cyclopropen-1-yl)-1,4-dihydro[60]fullerenes. The newly formed C–C bond of these hydrocarbons was found to undergo reversible heterolysis in polar solvents to give the original ions. A more highly stabilized
所述的反应叔丁基-C 60阴离子(吨-BuC 60 -与tricyclopropylcyclopropenylium离子和1,2-二环丙基-3-(4-甲基苯基)cyclopropenylium离子后行C-C共价键形成,得到1-)叔-丁基-4-(2-环丙烯-1-基)-1,4-二氢[60]富勒烯。发现这些烃的新形成的C–C键在极性溶剂中经历可逆杂溶,从而产生原始离子。更高度稳定的碳阳离子三[1-(5-异丙基-3,8- dimethylazulenyl)] cyclopropenylium离子不与反应吨-BuC 60 - ,和具有盐结构的烃被分离成固体。三叔-butylcyclopropenylium离子,虽然比其他阳离子稳定以下,后行没有C-C键形成与吨-BuC 60 - ,表明空间位阻,有效地抑制碳阳离子负离子协调。这些结果提供了在之间的反应性的变化的示范吨-BuC 60 -朝向C-C协调和