REACTIONS OF MANGANESE PENTADIENOYL COMPLEXES - SYNTHESIS OF (ETA(4)-ALLYL-AMIDE)MN(CO)(3) COMPLEXES - (ETA(4)-OXAPENTADIENYL)MN(CO)(3) COMPLEXES

(eta(1)-(2Z,4E)-5-phenylpentadienoyl)Mn(CO)(5)(2) was prepared by the reaction of Li(CO)(5)Mn and (2Z,4E)5-phenylpentadienoyl chloride. Intr oduction of 2 to N-methylmorpholine N-oxide in the presence of selecte d amines gives the amine-substituted eta(4)-oxapentadienyl complexes 3 a-d, which may also be described as (eta-allyl-amide)Mn(CO)(3) complex es. Reaction of 2 with trimethylamine N-oxide in the absence of nucleo philes gives the dimethylamine-eta(4)-oxapentadienyl complex 3e. X-ray crystallographic analysis of this complex corroborates that the oxape ntadienyl ligand is bonded in an eta(4) fashion. Addition of CH3OH and N-methylmorpholine N-oxide to 2 forms the carbomethoxy ester substitu ted eta(3)-allyl complex 6.