Abstract
Syntheses of the new ansa yttrocene derivatives OPY(μ-Cl)2Li(OEt2)2 (Op= [(η5-C5Me4)2SiMe2]), OpYCH(SiMe3)2 and [OPY]2(μ2-H)2 are described. The structure of OpYCH(SiMe3)2 has been examined by single crystal X-ray diffraction methods. OpYCH(SiMe3)2 crystallizes in the monoclinic space group P21c (no. 14) with a = 10.441(2), b = 15.480(3), c = 19.644(4) A, β = 105.28(1)° and Z = 4. The bis(trimethylsilyl)methyl ligand is distorted in the equatorial plane such that one of the methyl groups of the [CH(SiMe3)2] bridges yttrium and a silicon in a 3-center, 2-electron bridging fashion. Hydrogenolysis of OpY-CH(SiMe3)2 results, initially, in the formation of the ansa yttrocene hydride dimer [OPY]2(μ2-H)2. This compound is unstable with respect to ligand redistribution affording the hydride- and Op-bridged (‘flyover’) hydride dimer Y2[μ2-[(η5-C5Me4)SiMe2(η5-C5Me4)]]2(μ2-H)2.
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