The Hieber Anion [Fe(CO)3(NO)]-

All articles of this category Introduction Transition metals are a cornerstone in organic chemistry and their application both as stoichiometric reagents and catalysts has gained much attention. Increased efforts towards economically and ecologically benign processes have put the spotlight on readily available and non-toxic metals, such as iron. Among these is the iron complex [Fe(CO) 3 (NO)] - , also referred to as a Hieber anion. [ ¹ ] The Bu 4 N salt may be easily prepared from Fe(CO) 5 , NaNO 2 , and Bu 4 NBr (Scheme [ ¹ ] ). [ ² ] Nucleophilic attack of the nitrite onto a CO ligand forms putative intermediate 2 which results in 1 upon extrusion of CO and CO 2 causing a reduction of the iron center. Scheme 1 Preparation of Bu4N[Fe(CO)3(NO)]