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Formation and Cleavage of C−C, C−O, and O−H Bonds Involving Methoxycarbyne and Hydroxycarbyne Ligands at Unsaturated Dimolybdenum Complexes

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posted on 15.08.2005, 00:00 by Celedonio M. Alvarez, M. Angeles Alvarez, M. Esther García, Daniel García-Vivó, Miguel A. Ruiz
Reversible carbyne−carbyne coupling occurs upon addition of simple ligands L (CO, tBuNC) to the bis(methoxycarbyne) complex [Mo2Cp2(μ-COMe)2-(μ-PCy2)]BF4 to give the dimethoxyacetylene-bridged derivatives [Mo2Cp2{μ-η22-C2(OMe)2}(μ-PCy2)L2]BF4. Upon demethylation, the dicarbonyl cation experiences a 1,2-methoxyl shift to give the carboxycarbyne derivative [Mo2Cp2{μ-C(CO2Me)}(μ-PCy2)(CO)2].