In this study imidazolium and imidazolinium centers in precursor [2]rotaxanes were deprotonated to obtain interlocked molecules featuring stabilized N-heterocyclic carbene centers. The encircling macrocyclic components enhanced the persistence of the otherwise unstable imidazolidin-2-ylidenes in solution at 253 K for more than a week in the absence of air.

中文翻译：

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互锁增加了溶液中N-杂环卡宾的持久性。

在这项研究中，前体[2]轮烷中的咪唑鎓和咪唑啉鎓中心被去质子化，以获得具有稳定的N-杂环卡宾中心的互锁分子。在没有空气的情况下，环绕的大环组分在253 K的溶液中增强了否则不稳定的咪唑烷-2-吡咯烷酮在溶液中的持久性，持续了一周以上。