As established by NMR, circular dichroism, and X-ray diffraction, organolanthanides of the new chelating ligand Me2Si(tBuCp)[(+)-neo-Men-Cp]2- (Men = menthyl; Cp = η5-C5H3) preferentially adopt a single chiral configuration of the asymmetric metal−ligand template. Metallocene dichloro complexes (R,S)-Me2Si(tBuCp)[(+)-neo-Men-Cp]Ln(μ-Cl2)Li(OEt2)2 (Ln = Y, Lu) are synthesized by alkylation of the corresponding
通过NMR,圆二色性和X射线衍射确定,新的螯合
配体Me 2 Si(tBuCP)[(+) -新-Men-的CP] 2 - (男性=薄荷基等; CP =η 5 -C 5 H ^ 3)优先采用非对称
金属-
配体模板的单一手性构型。茂
金属二
氯配合物(R,S)-Me 2 Si(tBuCP)[(+) -新-Men-的CP] LN(μ-CL 2)的Li(OET 2)2(Ln为Y,Lu)的通过与配位体二
锂盐相应的
镧系元素的三
氯化物的烷基化合成和隔离通过从
乙醚中结晶来异构化纯。用MCH(SiMe 3)2(M = Li,K)对(R,S)-末端烷基进行烷基化,保留了
镧系元素中心的构型,从而以高收率提供了手性烃基配合物。Lu-烃基与氢反应得到非对映体纯的(R,S)-Me 2 Si(tBuCP)[(+)- neo -Men-CP] LuH} 2,一种不对称烯烃加氢的活性催化剂。X射线衍射显示具有伪内消旋CP环取代基排列的伪C