Photolysis of a benzene solution containing Fe(CO)5 and [(η5-C5R5)Mo(CO)3(C⋮CPh)] yielded mixed-metal clusters [(η5-C5R5)Fe2Mo(CO)8(μ3-η1:η2:η2-CCPh)] (R = H, 1; Me, 2) and [(η5-C5H5)Fe3Mo(CO)11(μ4-η1:η1:η2:η1-CCPh)] (3). When a mixture of [(η5-C5Me5)Mo(CO)3(C⋮CPh)], Fe(CO)5, and phenylacetylene was photolyzed, coupling of the acetylide and acetylene was observed and the mixed-metal cluster [(η5-C5Me5)Fe2Mo(CO)7(μ3-η1:η4:η2-C(H)C(Ph)C(Ph)C)] (4) was obtained. Interestingly, use of a bulky substituent on the free acetylene in the reaction mixture did not produce analogues of 4. Reaction of Fe(CO)5 with ferrocenylacetylene produced three different compounds, tetracarbonyl(2-ferrocenylmaleoyl)iron (5), 2,5-diferrocenylquinone (6), and 2,6-diferrocenylquinone (7). All new compounds were characterized by IR and 1H and 13C NMR spectroscopy. Structures of 2−7 were established crystallographically.

No abstract

The new bis(chalcogenopropargyl)ferrocene complexes [Fe(η5-C5H4EICH2C⋮CH)2] (EI = Se, 1; EI = S, 2) have been prepared by treatment of the dilithiated [Fe(η5-C5H4Li)2] with Se or S powder, followed by reaction with propargyl bromide. Reaction of 1 and 2 with [Fe2M(μ3-E)2(CO)9] (E = S, Se and M = Fe, Ru) forms new clusters which feature an unusual five-membered FeEICHCCH2 ring with a π bond between the olefinic unit and the Fe atom, and the Cp rings adopt an eclipsed arrangement. The structures of 1 and [Fe(η5-C5H4EICH2C⋮CH)(η5-C5H4{Fe2M(CO)8(μ-E)(μ3-E)(EICHCCH2)})] (M = Fe, E = Se, EI = Se, 3; M = Fe, E = S, EI = Se, 4; M = Ru, E = S, EI = Se, 7) have been determined crystallographically.

No abstract

No abstract