The ansa-metallocenes 1 and 2 can be obtained in one-pot processes by reductive coupling of 6,6-dimethylfulvene in the presence of samarium and ytterbium powder, respectively. The ready accessibility and high reactivity make these lanthanide(II) complexes attractive starting materials for organometallic syntheses.
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Recknagel et al. (1991) studied this question.
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