FeTAML(=O), TAML = tetra-amido macrocyclic ligand, is formed by the reaction of [Fe(TAML)(HO)](PPh) with 2-5 equivalents of meta-chloroperbenzoic acid at -60 ˚C in n-butyronitrile. This deep green compound (two λ at 445 and 630 nm respectively) is stable at 77 K.  The stabilization of Fe(V) is attributed to the strong π–donor capacity of deprotonated amide nitrogens.