Transition metal‐catalyzed semihydrogenation of alkynes is one of the most efficient, sustainable, and environmental‐friendly strategies for accessing stereoisomerically pure olefins. Herein, we report a tridentate nitrogen‐containing ligand (8‐OIQ) promoted cobalt‐catalyzed stereodivergent semihydrogenation of internal alkynes; a series of Z ‐ and E ‐alkenes could be synthesized with high stereoselectivity. Besides, this protocol exhibits excellent functional group tolerance and operates under mild reaction conditions (1 bar H 2 , room temperature). A preliminary mechanistic study revealed that acetonitrile plays an important role in suppressing over‐reduction and controlling the stereoselectivity in this transformation.
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Ren et al. (2025) studied this question.
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