Cp,Yb] reacts with HOR (Cp = C5H5; R = CHzCH=CH2, CH2CH2Me) in thf (thf = tetrahydrofuran) at room temperature to give complexes [{Cp2Yb(p-OR)}2], which are dehydrogenated to yield the new complex [{Cp,Yb(p-OCH=C=CH2,)21 in refluxing thf solution; the X-ray crystal structure shows that the new complex is dimeric with oxygen atoms as bridging groups.
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