The synthesis and characterization
of <b>Ln-C</b><sub><b>4</b></sub><b>Ph</b><sub><b>4</b></sub><b>-K</b>, [(NN<sup>TBS</sup>)Ln(η<sup>2</sup>-C<sub>4</sub>Ph<sub>4</sub>)][K(THF)<sub><i>x</i></sub>] (Ln = Sc, Y, Lu), rare-earth
metal complexes supported by a ferrocene diamide ligand, NN<sup>TBS</sup> (NN<sup>TBS</sup> = fc(NSi<sup><i>t</i></sup>BuMe<sub>2</sub>)<sub>2</sub>, fc = 1,1′-ferrocenediyl), were accomplished.
The preparation of the half-sandwich compounds, <b>Ln-naph-K</b>, [(NN<sup>TBS</sup>)Ln(μ-C<sub>10</sub>H<sub>8</sub>)][K(THF)<sub>2</sub>] (Ln = Sc, Y, Lu, La), was necessary in order to obtain high
yields of rare-earth metallacyclopentadienes. Unlike Y and Lu, La
did not show the same reactivity toward PhCCPh. The characterization
of the new metal complexes was accomplished by NMR spectroscopy, elemental
analysis, and single-crystal X-ray diffraction
