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A trans-selective organocatalytic semireduction of activated alkynes is achieved via phosphine redox catalysis using water as the hydrogen source. Broad substrate scope, functional group tolerance, and deuterium incorporation from D2O are demonstrated. Mechanistically, the in situ generated phosphine mediates proton transfer followed by alkene Z to E isomerization.
Z. Ye, M. Wang, H. Li, W. Su, Y. Shang and X. Jie, Chem. Commun., 2026, Accepted Manuscript , DOI: 10.1039/D6CC02689C
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