Preparation of Organomanganese Compounds from Mn

Organomanganese reagents can also be prepared directly from manganese metal and organic halides like Grignard reagents. 

Of course, this route seems very attractive for the preparation of functionalized organomanganese reagents since it is thus possible to circumvent the limitations due to the use of organomagnesium or lithium compounds as an intermediate. However, until now, only a few examples have been described since the activated manganese is often too reactive to be sufficiently chemoselective. Nevertheless, the first alkylmanganese bromide bearing an ester group has been prepared by this route (Sciieme 13.4). 

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