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Synlett 2011(18): 2757-2758  
DOI: 10.1055/s-0031-1289559
SPOTLIGHT
© Georg Thieme Verlag Stuttgart ˙ New York

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

Johannes E. M. N. Klein*
Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
e-Mail: johannes.klein@oc.uni-stuttgart.de;
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Publikationsdatum:
25. Oktober 2011 (online)

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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 Bu4N salt may be easily prepared from Fe(CO)5, NaNO2, and Bu4NBr (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 CO2 causing a reduction of the iron center.

Scheme 1  Preparation of Bu4N[Fe(CO)3(NO)]

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