Nonclassical Organolanthanoid Metal Chemistry:  [K([18]-crown-6)(η<sup>2</sup>-PhMe)<sub>2</sub>]X (X = [(LnCp<sup>t</sup><sub>3</sub>)<sub>2</sub>(μ-H)], [(LnCp‘ ‘<sub>2</sub>)<sub>2</sub>(μ-η<sup>6</sup>:η<sup>6</sup>-PhMe)]) from [LnCp<sup>x</sup><sub>3</sub>], K, and [18]-crown-6 in Toluene (Ln = La, Ce; Cp<sup>t</sup> = η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>SiMe<sub>2</sub>Bu<sup>t</sup>; Cp‘ ‘ = η<sup>5</sup>-C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>-1,3)

Treatment of [LnCp<sup>t</sup><sub>3</sub>] or [LnCp‘ ‘<sub>3</sub>] with potassium and [18]-crown-6 in toluene at ambient temperature yielded two quite different crystalline potassium salts:  [K([18]-crown-6)(η<sup>2</sup>-PhMe)<sub>2</sub>]X (X = [(LnCp<sup>t</sup><sub>3</sub>)<sub>2</sub>(μ-H)], [(LnCp‘ ‘<sub>2</sub>)<sub>2</sub>(μ-η<sup>6</sup>:η<sup>6</sup>-PhMe)]; Ln = La, Ce; Cp<sup>t</sup> = η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>SiMe<sub>2</sub>Bu<sup>t</sup>; Cp‘ ‘ = η<sup>5</sup>-C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>-1,3).