This focus review describes the status quo of synthetic routes to cyclic compounds and cyclic polymers via spontaneous cyclization processes using (1) rotaxane chemistry and (2) dynamic covalent chemistry. Systems with rotaxane-based structures undergo spontaneous and selective cyclization of two self-complementary molecules and a macromolecular rotaxane switch, where the relative position of each component can be controlled, which results in a topology change from linear to cyclic. Systems based on dynamic covalent chemistry use exchange reactions of bis(2,2,6,6-tetramethylpiperidin-1-yl)disulfide (BiTEMPS) units that behave as stable linkages at r.t. and exchange disulfide bonds upon heating. Controlling the dynamic nature of BiTEMPS-based low-molecular-weight compounds and polymers thus provides cyclic topologies via spontaneous and selective cyclization processes. This focus review describes the synthetic routes to cyclic compounds and cyclic polymers via spontaneously occurring cyclization processes using (1) rotaxane chemistry and (2) dynamic covalent chemistry. Systems with rotaxane-based structures proceed via the spontaneous and selective cyclization of two self-complementary molecules and a macromolecular rotaxane switch, which results in a topology change from linear to cyclic. Systems based on dynamic covalent chemistry use exchange reactions of bis(2,2,6,6-tetramethylpiperidin-1-yl)disulfide (BiTEMPS) units. Controlling the dynamic nature of BiTEMPS-based molecules provides cyclic topologies via spontaneously and selectively occurring cyclization processes.

中文翻译：

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通过自发和选择性环化反应合理进入环状聚合物

这篇重点综述描述了通过使用 (1) 轮烷化学和 (2) 动态共价化学通过自发环化过程合成环状化合物和环状聚合物的途径的现状。具有基于轮烷结构的系统经历了两个自互补分子和一个大分子轮烷开关的自发和选择性环化，其中每个组件的相对位置可以控制，从而导致拓扑结构从线性变为环状。基于动态共价化学的系统使用双 (2,2,6,6-四甲基哌啶-1-基) 二硫化物 (BiTEMPS) 单元的交换反应，这些单元在室温下表现为稳定的连接，并在加热时交换二硫键。控制基于 BiTEMPS 的低分子量化合物和聚合物的动态性质，从而通过自发和选择性环化过程提供环状拓扑。本重点综述描述了通过使用 (1) 轮烷化学和 (2) 动态共价化学通过自发发生的环化过程合成环状化合物和环状聚合物的路线。具有基于轮烷结构的系统通过两个自互补分子和大分子轮烷开关的自发和选择性环化进行，这导致拓扑结构从线性变为环状。基于动态共价化学的系统使用双 (2,2,6,6-四甲基哌啶-1-基) 二硫化物 (BiTEMPS) 单元的交换反应。