Manganese(I)‐Catalyzed Asymmetric (Transfer) Hydrogenation of Simple Ketones by a Novel Chiral Tridentate P*NN Ligand

A novel chiral P*NN ligand featuring a P‐chirality has been synthesized, and its catalytic properties in Manganese(I)‐catalyzed asymmetric hydrogenation and asymmetric transfer hydrogenation of ketones are investigated. A broad range of substrates (42 examples) are hydrogenated, delivering a series of chiral alcohols with outstanding yields (>90%) and good enantioselectivities (up to 92% ee ). In addition, a plausible catalytic cycle is performed through deuterium‐labeling experiments and high‐resolution mass spectrometry analysis.