An atropisomer is a member of a subclass of restricted rotational conformers-this restricted rotation giving rise to stereogenic sigma bonds-that can be isolated as separate chemical species. Most atropisomer are six-membered-ring biaryl or heterobiaryl derivatives. The aim of this microreview is to shed light on a less common class of atropisomers, those containing at least one five-membered hetero-or carbocycle and displaying variously a stereogenic C-N, CC , or even N-N

中文翻译：

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具有五元环的阻转异构体的鸟瞰图

阻转异构体是受限旋转构象异构体子类的成员——这种受限旋转产生立体σ键——可以作为单独的化学物质分离。大多数阻转异构体是六元环联芳基或杂联芳基衍生物。这篇微观评论的目的是阐明一类不太常见的阻转异构体，这些阻转异构体包含至少一个五元杂环或碳环，并以不同的方式显示出立体异构 CN、CC 甚至 NN