1.1 Iridium Catalysts 238Р10.1.1.1 Iridium / P-P Ligands 238Р10.1.1.2 Iridium / Phosphine–Phosphite Ligands 241Р10.1.1.3 Iridium / Diphoshite, Diphosphinite and Phosphinite–Phosphite Р Ligands 241Р10.1.1.4 Iridium / P,N-Ligands 243Р10.1.1.5 Iridium / N-Ligands 245Р10.1.1.6 Other Iridium / Phosphorous Systems 246Р10.1.2 Rhodium and Palladium Catalysts 247Р10.1.3 Ruthenium Catalysts 248Р10.1.4 Titanium and Zirconium Catalysts 248Р10.1.5 Gold Catalysts 249Р10.2 Green Approaches 249Р10.2.1 anic Two-Phase Solvent Systems 249Р10.2.2 Catalyst Immobilization on Insoluble Materials 252Р10.2.3 Carbon Dioxide / Ionic Liquid Media 255Р10.3 Mechanistic Insights 257Р10.3.1 Homolytic and Heterolytic H2-Metal Activation 258Р10.3.2 H−/H+ Transfer to the Imine in the Inner or Outer Р Coordination Sphere 259