Bis(di-tert-butylcyclopentadienyl)ytterbium(ii). Synthesis and catalytic properties

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Polymeric (Cp2Yb·THF) n (1), ionicate-complex Cp3YbNa (2), and mono-adduct (But2C5H3)2Yb·THF (3) were prepared through a reaction of Cp″Na (Cp″ = C5H5 or C5H3But2) with Ybl2 in THF. Cooling complex (3) in THF at −100 °C gives a bis-adduct, which reversibly dissociates to give the mono-adduct, The (But2C H , Yb·THF complex shows catalytic activity in the homogeneous hydrogenation of hex-l-ene and in the polymerization of styrene.