Alkylmanganese pentacarbonyl complexes

RMn(CO)5.3 Alkylmanganese pentacarbonyl complexes are obtained by reaction of alkyl halides with NaMn(CO),. Under pressures of 2-10 kbar, these complexes undergo an insertion reaction with alkenes to give usually a single manganacycle in which the electron-withdrawing group of the alkene is attached to the same carbon atom as the metal. Demetallation is accomplished by photolysis... 

Finally, (trialkylsilyl)manganese pentacarbonyl complexes (TMS-Mn(CO)5) react with oxiranes in a regioselective manner to furnish functionalized alkylmanganese pentacarbonyl complexes, which have been converted to spiroketal lactones or cyclopentenone derivatives <88JOC4892>. 

As expected, coordinating molecules other than CO can react and result in the shift of a coordinated CO to an acyl CO. Cyclohexylamine, for example, reacts with alkylmanganese pentacarbonyls to produce acylmanganese tetracarbonyl cyclohexylamine complexes (59). 

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