[η5-1,2,3,4,5-pentakis(carbomethoxy)cyclopentadienyl]tricarbonylmanganese(I): Synthesis, spectroscopy and reactivity

Treatment of the potassium salt of pentakis(carbomethoxy)cyclopentadiene with bromopentacarbonylmanganese(I) gives pentakis(carbomethoxy)cyclopentadienyltricarbonylmanganese(I) in good yield. Photochemical substitution of a metal carbonyl group by tributylphosphine, triphenylphosphine and triethyl phosphite is reported. Attempts to modify the ester function are described; hydrolysis or amination give mixed products but reduction with lithium aluminum hydride yields ultimately the pentamethylcyclopentadienyl complex.