Reactions of bis(hexamethylbenzene)iron(0) with carbon monoxide and with unsaturated hydrocarbons |
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Authors: | Sharon R. Weber Hans H. Brintzinger |
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Affiliation: | 1. Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48104 U.S.A.,;2. Fachbereich Chemie, Universität Konstanz, D 7750 Konstanz West Germany |
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Abstract: | Thermal decomposition of bis(hexamethylbenzene)iron(0) in the presence of carbon monoxide yields a novel carbonyl iron complex, [C6(CH3)6]Fe(CO)2. The cyclohexadiene complex [C6(CH3)6]Fe(C6H8) is obtained from reaction of bis(hexamethylbenzene)iron(0) with either 1,3-cyclohexadiene or benzene, and the yield is much greater in the presence of hydrogen gas. Interaction of bis-(hexamethylbenzene)iron(0) with 2-butyne induces a catalytic cyclotrimerization to give more hexamethylbenzene. Kinetic and isotope distribution studies indicate that the primary step in these reactions is not a direct loss of one ring ligand, but rather an insertion of the iron center into one of the ligand methyl CH bonds, leading to a benzyl hydride complex species. Mechanisms for the subsequent reactions of this iron hydride species are proposed. |
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Keywords: | To whom correspondence should be addressed at Universität Konstanz 7750 Konstanz B.R.D. |
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