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Bioinorganic complexes of Fe(II) with chloride, the bulky α-keto-acid 2,6-dimesitylbenzoyl formate and (A) N,N,N′,N′-tetramethylpropylendiamine or (B) 6,6′-dimethyl-2,2′-bipyridine mimick the active site geometry of cofactor bound Fe(II) dependent halogenases but are inert towards O2. (C) A complex, where unsubstituted benzoyl formate is used and the chloride ion cannot be stabilized at the Fe(II) center shows α-ketoacid decarboxylation in the presence of O2.
