Abstract
AbstractThe ruthenium‐catalyzed ring‐closing metathesis (RCM) reactions of various [η5‐(ω‐alkenyl)cyclopentadienyl](ω‐alkenylphosphine)manganese(I) dicarbonyl complexes were examined. The RCM reaction between an η5‐allyl‐ or an η5‐vinyl‐cyclopentadienyl ligand and an allyldiphenylphosphine ligand in the manganese coordination spheres gave the corresponding cyclized products in good to excellent yields. The X‐ray analyses of the two cyclized products revealed the structural differences between the C3‐ and the C4‐bridged complexes. The RCM reactions of the o‐bromo‐substituted manganese complexes were also operative and the cyclized products were obtained in excellent yields of >95%. The preferential formation of the C4‐bridged species over the C3‐bridged analogues in the RCM of the manganese complexes was confirmed by an intramolecular competitive RCM experiment with the [η5‐1‐(methallyl)‐2‐(2‐propenyl)cyclopentadienyl](allyldiphenylphosphine)manganese(I) dicarbonyl complex.magnified image
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