Nickel-Catalyzed Reductive Couplings of Aldehydes and Alkynes.- Reductive C-C Bond Formation after Epoxide Opening via Electron Transfer.- Catalytic Reductive Coupling of Carbonyl Compounds - The Pinacol Coupling Reaction and Beyond.- Catalytic Reductive Coupling of Alkenes and Alkynes to Carbonyl Compounds and Imines Mediated by Hydrogen.- Reductive Aldol, Michael, and Mannich Reactions.- Recent Advances in Alkene Hydroformylation.- Nickel-Catalyzed Reductive Coupling of Dienes and Carbonyl Compounds.- Reductive Coupling of Unactivated Alkenes and Alkynes.