Synthesis, stability and molecular structure of novel hydrocarbon cations consisting of a tropylium cation and two spiro[4.5]deca-2,4-dienes
作者:Mitsunori Oda、Hitoshi Kainuma、Takuya Uchiyama、Ryuta Miyatake、Shigeyasu Kuroda
DOI:10.1016/s0040-4020(03)00369-7
日期:2003.4
Two novel hydrocarbon cations with a tropylium ion ring fused by two spiro[4,5]deca-2,4-dienes, 9 and 10, were synthesized by a six-step sequence starting from 1,6- and 1,5-diacetyl-1,3,5-cycloheptatrienes, respectively. The pKR+ values of 9 and 10 were found to be the same at 13.2, providing a new access to highly stable cations. The density functional calculations predict that both 9 and 10 have
通过从1,6-和1,5-二乙酰基开始的六步合成了两个带有两个螺[4,5] deca-2,4-二烯9和10稠合的对yl离子环的新型烃阳离子。-1,3,5-环庚烯。发现9和10的p K R +值在13.2处相同,为获得高度稳定的阳离子提供了新途径。密度泛函计算预测,9和10均具有环己烷环,且椅构象朝着分子边缘扩散,是最稳定的结构。晶体的包装与结构9 X射线晶体学分析也阐明了其中包括二氯甲烷的含量。