Dimanganese decacarbonyl, reaction with

Finally, manganese carbonyl complexes also show potential for effecting interesting phase transfer catalyzed carbonylation reactions. Alkynes react with carbon monoxide and methyl iodide in methylene chloride, using 5N NaOH as the aqueous phase, benzyl-triethylammonium chloride as the phase transfer catalyst, and either bromopentacarbonylmanganese or dimanganese decacarbonyl to afford... 

The best method for preparation of pentacarbonylchloromanganese is the reaction of chlorine with dimanganese decacarbonyl in carbon tetrachloride solution. Earlier versions of this procedure2 often give low yields however, the present version is reliable and produces a good yield. 

To obtain further evidence for the reaction scheme outlined above, the reaction has been carried out in the gas phase (7). Dimanganese decacarbonyl vapor and dinitrogen tetroxide were mixed at 60° C. A smoke was formed immediately the gases came into contact, which settled to a very pale yellow powder. This was the nitro compound, Mn(C0)5N02, containing only a trace of the nitrate, which may well have been formed by oxidation of the nitro compound under these conditions. The increased yield of Mn(C0)5N02 in the gas as compared with the liquid state is consistent with the free-radical interpretation, since heterolytic dissociation of the tetroxide is no longer possible. 

Alternative methods are available for the preparation of [Mn(CO)5] . A convenient method is the reaction of dimanganese decacarbonyl with hydroxide ion 146)... 

---