Abstract
AbstractA novel ionic complex, bis[1‐butyl‐2‐(diphenylphosphanyl)‐3‐methylimidazolium]tetrachloridoruthenium(III) hexafluorophosphate (2), has been synthesized and fully characterized. The single‐crystal X‐ray diffraction analysis showed that 2 is composed of an Ru complex cation and PF6– anion. The cation has a highly symmetrical Ru‐centered octahedron geometry with four Cl atoms in the equatorial plane and two imidazolium‐substituted phosphane ligands in the axial positions. It exhibits paramagnetism due to the presence of one unpaired electron in the phosphane‐ligated low‐spin RuIII complex. Complex 2 exhibited good catalytic performance in the transfer hydrogenation of a wide range of ketones by using alcohols as hydrogen donors. Owing to its high polarity, good thermal stability, and insensitivity to moisture and oxygen, complex 2 could be used in six catalytic cycles in the transfer hydrogenation of acetophenone without any obvious loss of activity.
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