An enzyme substitute: A synthetic FeIII porphyrin was used as a catalyst for the activation and reduction of O2 into H2O with the cofactor NAD(P)H in aqueous solution. The catalyst is compatible with different preparative enzymatic oxidation reactions. Thus, a new method is provided for the in situ regeneration of the oxidized cofactor NAD(P)+ with help from a non‐enzymatic, synthetic catalyst (see scheme).

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The metal complex FeTSPP (5,10,15,20‐tetrakis‐(4‐sulfonato‐phenyl)‐porphyrin‐iron(III) chloride; also denoted as FeTPPS), which consists of an iron(III) center ion (an environmentally advantageous metal) and a highly water‐soluble heme ligand, represents an exciting and already broadly applied catalyst in the area of “green” oxidation reactions in aqueous media. This commercially available iron catalyst shows a high oxidation potential for many substrates. Further advantages are its high stability and ability not to aggregate in aqueous solution. This Minireview gives an overview of the structural properties of FeTSPP in aqueous solution and selected applications as an oxidation catalyst for organic syntheses, biorenewable degradations, and environmental applications.

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