“…49–51 The seminal discovery of hydrogenation of unsaturated compounds, mostly using heterogeneous nickel catalysts, was made by Sabatier, Senderens, Ipatieff, and Raney. 52,53 By contrast, (transfer) partial hydrogenation of alkynes to alkenes catalyzed by the first-row 3d transition metal catalysts under homogeneous conditions is rare and less investigated. 54–57 There are limited reports on catalytic semihydrogenation of alkynes to stereoselective olefins under nickel catalysis; 58–63 nevertheless, most of the methods suffer due to the use of strong reductants and basic or acidic conditions.…”