Patent ID: 7582786

Claim:
A salen-metal compound having antioxidant activity and having a structural formula of Structure XXIII or Structure XXIV as shown in FIG. 26E , wherein: M is selected from the group consisting of Mn, Co, Fe, V, and Cr; A is an axial ligand selected from the group consisting of Cl, F, O, Br and acetyl; X 2 , X 3 and X 4 are independently selected from the group consisting of hydrogen, lower alkoxy, halide and aryloxy; Y 2 , Y 3 and Y 4 are independently selected from the group consisting of hydrogen, lower alkoxy, halide and aryloxy; and R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, aryl, substituted aryl, heteroatom-bearing aromatic, arylalkyl, lower alkoxy and halide and wherein one of R 1 and R 2 is optionally covalently linked to one of R 3 and R 4 thereby forming a cyclic structure.