The hexahydride OsH6((PPr3)-Pr-i)(2) reacts with cyclohexylmethyl ketone to
give the trihydride OsH3-{C6H8C(O)CH3)((PPr3)-Pr-i)(2), which has been cha
racterized by X-ray diffraction analysis. In solution, the hydride ligands
of this complex undergo two different thermally activated exchange processe
s. Two of them also show weak quantum exchange coupling.