High-yield synthesis of a unique Mn(iii) siloxide complex through KMnO₄ oxidation of a Mn(ii) precursor

Abstract

A unique trivalent manganese siloxide complex, blue-violet MnLiCl[(PhSiO)O](THF)·2THF (3) has been prepared by a straightforward two-step synthetic protocol. Lithiation of (PhSiOH)O (1) followed by reaction with MnCl(THF) gave the structurally remarkable Mn(ii) precursor MnLiCl[(PhSiO)O](THF)·2THF (2). Surprisingly, the final oxidation step could be achieved using KMnO in THF to provide the Mn(iii) species 3 in high yield (91%). Both title compounds were structurally characterized by single-crystal X-ray diffraction.