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A highly stereoselective alkyne semihydrogenation with copper(I) complexes is reported. Copper–N‐heterocyclic carbene complex catalysts, bearing an intramolecular CuO bond, allow for the direct transfer of both hydrogen atoms from dihydrogen to the alkyne. The corresponding alkenes can be isolated with high Z selectivity and negligible overreduction to the alkane.
Not so precious! The combination of copper acetate and chiral monodentate ligands allows the enantioselective hydrogenation of carbonyl compounds to take place in good to high yields with moderate to good enantioselectivities (see scheme).
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