Inorganic Chemistry p. 1132 - 1141 (1980)
Update date:2022-07-30
Topics:
Freeman, Michael B.
Hall, Laurence W.
Sneddon, Larry G.
The reactions of cobalt atoms and cyclopentadiene with various alkynes such as hexafluorobutyne, trifluoropropyne, and diphenylacetylene have been found to yield a variety of new organometallic compounds including both mono- and multimetal complexes. In general the products obtained fall into four categories: (1) complexes containing ligands resulting from dimerization or trimerization of the alkyne usually accompanied by hydrogen addition, i.e., (η-C5H5)Co[C4H2(CF 3)4], (η-C5H5)2Co2[C5H 2F(CF3)3], (η-C5H5)2Co2[C6H 5(CF3)3], [η,-C5(CH3)5]Co[C4H 2(CF3)4], (η-C5H5)2Co2[C2H 2(CF3)]2, and (η-C5H5)Co[C4(C6H 5)4]; (2) multimetal clusters containing cyclopentadienylcobalt units and alkynes, i.e., (η-C5H5)3Co3[C 2(CF3)2], (η-C5H5)3Co3[C 2(CF3)2](μ3-CO), and [η-C5(CH3)5]2Co 2[C2(CF3)2]2; (3) complexes containing ligands resulting from cycloadditions of cyclopentadiene and alkynes, i.e., (η-C5H5)Co[C7H6(CF 3)2] and (η-C5H5)Co[C9H6(CF 3)4]; (4) complexes containing ligands resulting from simple additions of cyclopentadiene and alkynes, i.e., (η-C5H5)2Co2[C7H 8(CF3)2], (η-C5H5)2Co2[C9H 4(CF3)4], (η-C5H5)2Co2[C9H 6(CF3)4], and (η-C5H5)Co[C9H6(C 6H5)4]. The nature of these products implies the formation of certain reactive cyclopentadienylcobalt intermediates in these metal atom reactions, and an appropriate reaction scheme is discussed.
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