Hexabenzo[4.4.4]propellane: A Helical Molecular Platform for the Construction of Electroactive Materials

Helical hexabenzo[4.4.4]propellane (a relative of hexaphenylethane) and its derivatives are synthesized and their structures are established by
X-ray crystallography. Isolation and X-ray crystallographic characterization of a robust trication-radical salt of hexamethoxypropellane derivative
confirms that its framework is stable toward oxidative (aliphatic) C−C bond cleavage. It is also demonstrated that propellane can be easily
brominated at the 4,4‘-positions of the biphenyl linkages for its usage as a molecular platform for the preparation of electroactive materials.

螺旋型六苯并[4.4.4]螺桨烷（hexabenzo[4.4.4]propellane，六苯乙烷的同系物）及其衍生物经成功合成，其分子结构通过X射线晶体衍射（X-ray crystallography）得以解析。针对一种六甲氧基螺桨烷衍生物的稳定三阳离子自由基盐开展分离与X射线晶体表征后证实，该衍生物的骨架在氧化（脂肪族）C-C键断裂条件下仍保持稳定。研究同时表明，该螺桨烷可在联苯连接位点的4,4'-位置轻松发生溴化反应，可用作制备电活性材料的分子平台。