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Coupling of Alkynyl Ligands at a Quadruply Bonded Molybdenum Dimer

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journal contribution
posted on 15.10.1996, 00:00 by Kevin D. John, Steven J. Geib, Michael D. Hopkins
The complex [Mo2(C≡CSiMe3)3(μ,η22-HC≡CSiMe3){μ,η1-CC(SiMe3)-η2-C⋮CSiMe3}(μ-dmpm)2][Li(dme)] ([1][Li(dme)]; dmpm = 1,2-bis(dimethylphosphino)methane, dme = 1,2-dimethoxyethane) was prepared in 32% yield from the reaction between Mo2Cl4(dmpm)2, LiCCSiMe3, and HCCSiMe3 in dme. A single-crystal X-ray diffraction study of [1][Li(dme)0.5(OEt2)0.5] revealed that 1 contains an alkynylvinylidene ligand derived from the head-to-tail coupling of two alkynyl ligands.