High-valent oxo complexes of osmium as selective oxidants for cyclohexene oxidation. Complexation of the bisamide tetradentate ligand bpb to osmium and the X-ray structure of trans-[osIII(bpb)(PPh3)Cl][bpbH2=N,N′-bis(2′-pyridine-carboxamide)-1,2-benzene]

Abstract

The reaction of N,N′-bis(2′-pyridinecarboxamide)-1,2-benzene (bpbH₂) with K₂[OsO₂(OH)₄] yielded trans-[Os^VI(bpbH₂)O₂]²⁺ which in turn gave trans-[Os^III(bpb)(PPh₃)Cl] upon treatment with PPh₃; the Os^III complex has been characterized by X-ray crystallography and found to catalyse the epoxidation of cyclohexene in the presence of iodosobenzene.