Synthesis, Table of Contents Synthesis 2017; 49(11): 2470-2482DOI: 10.1055/s-0036-1590112 paper © Georg Thieme Verlag Stuttgart · New York Tethered NHC Ligands for Stereoselective Alkyne Semihydrogenations Felix Pape Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany Email: johannes.teichert@chem.tu-berlin.de , Johannes F. Teichert* Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany Email: johannes.teichert@chem.tu-berlin.de › Author Affiliations Recommend Article Abstract Buy Article All articles of this category Abstract A copper(I)-catalyzed semihydrogenation of internal alkynes has been developed. A variety of oxygen- and nitrogen-tethered N-heterocyclic carbene (NHC) complexes have been investigated, leading to a highly Z-selective transformation. The catalyst is generated from inexpensive copper(I) chloride in situ and allows catalytic semihydrogenation down to 10 bar H2. 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