Nonclassical Organolanthanoid Metal Chemistry:  [K([18]-crown-6)(η2-PhMe)2]X (X = [(LnCpt3)2(μ-H)], [(LnCp‘ ‘2)2(μ-η66-PhMe)]) from [LnCpx3], K, and [18]-crown-6 in Toluene (Ln = La, Ce; Cpt = η5-C5H4SiMe2But; Cp‘ ‘ = η5-C5H3(SiMe3)2-1,3)

Treatment of [LnCpt3] or [LnCp‘ ‘3] with potassium and [18]-crown-6 in toluene at ambient temperature yielded two quite different crystalline potassium salts:  [K([18]-crown-6)(η2-PhMe)2]X (X = [(LnCpt3)2(μ-H)], [(LnCp‘ ‘2)2(μ-η66-PhMe)]; Ln = La, Ce; Cpt = η5-C5H4SiMe2But; Cp‘ ‘ = η5-C5H3(SiMe3)2-1,3).