Synthesis and Catalytic Applications of an Extended Range of Tethered Ruthenium(II)/η6‑Arene/Diamine Complexes

A series of novel enantiopure Ru­(II) complexes containing a chiral diamine and η6-arene connected by a tethering group have been prepared and were evaluated in the asymmetric reductions of a range of ketones. Changes to the level of steric hindrance and the addition of an electron-withdrawing functionality on the sulfonyl group have a significant effect on the reactivity and enantioselectivity of the catalysts.