One of the crucial aspects of alkyne semihydrogenation is diastereoselectivity control. In this issue of Chem Catalysis, Werlé et al. described a rhodium-based system that may lead to (Z)- or (E)-alkenes, depending on the solvent. The outer-sphere mechanism was observed for (Z)-semihydrogenation while (Z)→(E) isomerization proceeds via the inner-sphere mechanism.

中文翻译：

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溶剂控制的炔半氢化非对映选择性

炔烃半氢化的关键方面之一是非对映选择性控制。在本期《化学催化》中，Werlé 等人。描述了一种基于铑的系统，该系统可能会产生（ Z ）-或（ E ）-烯烃，具体取决于溶剂。 ( Z )-半氢化反应观察到外球机制，而( Z )→( E )异构化通过内球机制进行。