Generation of reactive cyclopentadienylcobalt(I) derivatives by reduction of dicyclopentadienyldicobalt tetraiodide |
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| Authors: | Wai-Sun Lee Hans H. Brintzinger |
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| Affiliation: | Fakultät für Chemie, Universität Konstanz, 7750 Konstanz Bundesrepublik Deutschland |
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| Abstract: | Reduction of [(C5H5)CoI2]2 by sodium amalgam in toluene in the presence of 1,3-butadiene, 1,3-cyclohexadiene or 1,5-cyclooctadiene affords the corresponding cyclopentadienylcobalt(I) diolefin complexes in high yields. Reduction of [(C5H5)CoI2]2 in the presence of 2-butyne yields the binuclear metallocyclic compound (C5H5)2Co2(C4(CH3)4), previously characterized as a structurally fluxional catalyst for alkyne cyclotrimerisation, as the major product; a trinuclear dicarbyne compound, (C5H5)3Co3(C-CH3)2, is obtained as a minor product. With diphenylacetylene, the analogous phenylcarbyne derivative (C5H5)3Co3(C-C6H5)2, previously obtained from thermal reaction with (C5H5)Co(CO)2, is obtained along with the major product, the tetraphenylcyclobutadiene complex (C5H5)Co(C4(C6H5)4). Pathways and intermediates for these reactions are discussed. |
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| Keywords: | Author to whom correspondence should be addressed. |
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