Ultrasound promoted asymmetric transfer hydrogenation of ketones using Ru(II)arene/amino alcohol catalyst system

Asymmetric transfer hydrogenation of ketones using Ru(II)arene/amino alcohol catalyst system proceeds with significant rate enhancement by ultrasound promotion. Comparison of the silent reactions carried out at 25 °C with reactions under sonochemical activation at 25 °C clearly showed enhancement in catalytic activity by 5–10 times without significantly affecting the enantioselectivity.