The Z-selective functionalization of terminal alkynes is a useful transformation in organic chemistry and mainly catalyzed by noble metals. Here, we present the Z-selective hydroboration of terminal alkynes catalyzed by a stable trans-dihydride iron complex [(PC_NHCP)Fe(H)₂N₂)] (2). Overall, the reaction occurs at room temperature and provides near quantitative yields of the Z-vinylboronate ester. Interestingly, the same catalyst could also provide the E-vinylboronate by heating the reaction mixture at slightly elevated temperatures (50 °C). If, however, the reaction is performed in the absence of HBpin, rapid Z-selective alkyne dimerization is observed, which is further discussed in this report.

中文翻译：

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反式二酐N-杂环碳烯（NHC）铁络合物催化Z选择性炔烃官能化。

末端炔烃的Z选择性官能化是有机化学中的有用转变，主要由贵金属催化。在这里，我们介绍了由稳定的反式-二酐铁络合物[（PC _NHC P）Fe（H）₂ N ₂）]（2）催化的末端炔烃的Z选择性氢硼化。总的来说，该反应在室温下发生，并提供接近定量的Z-乙烯基硼酸酯。有趣的是，相同的催化剂也可以提供E-在稍微升高的温度（50°C）下加热反应混合物，生成-乙烯基硼酸酯。但是，如果该反应是在不存在HBpin的情况下进行的，则会观察到快速的Z选择性炔烃二聚化，这将在本报告中进一步讨论。