Cover Picture: Enhancing Effects of Salt Formation on Catalytic Activity and Enantioselectivity for Asymmetric Hydrogenation of Isoquinolinium Salts by Dinuclear Halide‐Bridged Iridium Complexes Bearing Chiral Diphosphine Ligands (Chem. Eur. J. 5/2015)

Asymmetric arene hydrogenation: towards sustainability and application

“…It is proposed that iodine prevents the formation of inactive dinuclear metal complexes, thus increasing the catalytic rate. [29][30][31] Substrates can be activated by installing protecting groups to the heteroatoms of the arene that could serve as a directing group for the catalyst and/or protect the catalyst from being poisoned. [32][33][34][35] Also protonation of N-heteroarenes is a common strategy to lower the aromaticity of substrates.…”