In recent years, the metal carbonyls are increasingly used in organic synthesis. Many transition elements form stable neutral metal carbonyls, anionic metal carbonyls, hydrido metal carbonyls, and their derivatives1–4. These derivatives display unique reactivities in oxidation, reduction, isomerization, oligomerization, carbonylation and polymerization processes5,6. They have been also used extensively in C–C bond formation reactions7,8.Methods of preparation of Na2Fe(CO)4. The super nucleophile Na2Fe(CO)4 (Collman reagent) has been demonstrated to be a versatile reagent in several organic transformations10. Numerous methods have been reported for the preparation of this reagent from readily available starting materials10–13. Reaction of NaRCO[Fe(CO)4] with CuCl. The acylmetals such as ‘RCOCu’ are one of the most sought after intermediates in organometallic chemistry. It was anticipated that the use of CuCl in the place of H+ (Scheme 1) could lead to the formation of ‘RCOCu’. However, it was observed that the reaction of NaRCO [Fe(CO)4] with CuCl gives the corresponding 1,2-diketones (70–90%)15. This transformation is a general one and several alkyl bromides are converted into the corresponding 1,2-diketones (eq. 2).
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