The azadiboriridine [NRBRBR] (R=tBu), a three-membered ring of Hückel aromaticity, preferentially reacts at the B–B bond. Boranes BX₃ are added as Lewis acids to the B–B bond as the corresponding Lewis base to give a BBB-(3c2e) bond. Brønsted acids may be added in a similar way, but a B–B bond opening may also occur. This opening is the standard reaction, when carbenes and related species are incorporated to give four-membered rings or when unsaturated species ab yield the corresponding five-membered rings. All these findings make the mechanism of a fusion reaction plausible, that transforms azadiboriridines [NRBRBR′] with a group R′, less bulky than tBu, into nido-clusters N₂B₄R₄R′₂ in a stereospecific way.

中文翻译：

---

三-叔-butylazadiboriridine：用碱性硼-硼键的分子¹

氮杂二硼杂环丁烷[NRBRBR（]（R = t Bu），三元的Hückel芳香环，优先在BB键上反应。硼烷BX ₃作为路易斯酸作为相应的路易斯碱添加到BB键中，形成BBB-（3c2e）键。布朗斯台德酸可以类似的方式添加，但也可能发生B–B键打开。当加入碳烯和相关物质生成四元环时，或当不饱和物质ab产生相应的五元环时，此开环是标准反应。所有这些发现使融合反应的机理变得可行，该融合反应将体积小于t Bu的R'基的氮杂硼硼烷[NRBRBR']转化为Nido -clusters N ₂ B _4。[R ₄ R' ₂中的立体有择方法。