An air-stable and preactivated copper(i) hydroxide/N-heteroyclic carbene (NHC) complex for alkyne semihydrogenations is reported. Next to an enhanced practicability of the process, the resulting alkenes are obtained with high Z-selectivities and no overreduction to the corresponding alkanes.
Thiel, N. O., & Teichert, J. F. (2016). Stereoselective alkyne semihydrogenations with an air-stable copper(i) catalyst. Organic and Biomolecular Chemistry, 14(45), 10660–10666. https://doi.org/10.1039/c6ob02271e