Abstract

The η1-, η3-, and η5-ester dienolate complexes of Mn(CO)n have been prepared and the crystal structures of the phenyl ester member have been obtained for all three bonding modes. The allyl (anti- η3) member shows some bonding distortions compared to a simple allyl ligand. The structure of the η5-1-oxapentadienyl ligand complex is substantially different from a rhenium analog in that the organic ligand is non-planar with significantly different bond distances. The η5-complex reacts rapidly with triphenylphosphine to generate the syn-η3-complex. Keywords:

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