Nonclassical organolanthanoid metal chemistry:: [K([18]-crown-6)(η2-PhMe)2]X (X = [(LnCpt3)2(μ-H)], [(LnCp2)2(μ-η6:η6-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 [LnCp(3)(t)] 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)(eta(2)-PhMe)(2)]X (X = [(LnCp(3)(t))(2)-(mu-H)], [(LnCp (2))(2)(mu-eta(6):eta(6)-PhMe)]; Ln = La, Ce; Cp-t = eta(5)-C5H4SiMe2But; Cp = eta(5)-C5H3(SiMe3)(2)-1,3).