A catenane consisting of two [9]cycloparaphenylenes ([9]CPPs) has been synthesized. Density functional theory calculations suggested that [n]CPPs (n = 5, 6) are highly strained upon the formation of catenanes compared with the corresponding uncatenated CPPs, whereas [n]CPP catenanes (n ≥ 7) are not strained. The synthesis of ([9]CPP)([9]CPP)catenane was accomplished via the following route: (i) a spirosilylation, (ii) a nickel(0)-mediated macrocyclization, (iii) a desilylation, and (iv) reductive aromatization reactions. An X-ray diffraction analysis revealed a catenated structure of ([9]CPP)([9]CPP)catenane.

中文翻译：

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[9]环对亚苯基链烷的合成与结构：由小环组成的全苯链烷。

已经合成了由两个[9]环对亚苯基（[9] CPPs）组成的链烷。密度泛函理论计算表明，与相应的未分类CPP相比，[n] CPP（n = 5、6）在形成链环时受到很大的拉紧，而[n] CPP链烯（n≥7）则没有拉紧。（[9] CPP）（[9] CPP）catenane的合成可通过以下途径完成：（i）螺硅烷化，（ii）镍（0）介导的大环化，（iii）甲硅烷基化和（iv ）还原性芳构化反应。X射线衍射分析显示（[9] CPP）（[9] CPP）联烷的链状结构。