isolated. Treatment of [LnCH(2)Si(CH(3))(3)}(3)(thf)(2)] with amino phosphine ligands HL(2-R) gave stable rare earth metal bis-alkyl complexes [(L(2-R))LnCH(2)Si(CH(3))(3)}(2)(thf)] (4 a: Ln=Y, R=Me; 4 b: Ln=Lu, R=Me; 4 c: Ln=Y, R=iPr; 4 d: Ln=Y, R=iPr) in high yields. No proton abstraction from the ligand was observed. Amination of 4 a and 4 c with 2,6-diisopropylaniline afforded the bis-amido counterparts
苯胺磷膦
氨基辅助
配体H(2)L(1)与一当量的稀土
金属三烷基[Ln CH(2)Si(CH(3))(3)}(3)(thf)(2)反应]( Ln = Y,Lu)得到稀土
金属单烷基络合物[L(1)LnCH(2)Si(CH(3))(3)(THF)](1 a:Ln = Y; 1 b:Ln = Lu )。在此过程中,H(2)L(1)被一种
金属烷基物质去质子化,然后通过膦内部分的苯基分子内CH活化以生成双阴离子物质L(1),并释放出两个等价的四甲基
硅烷。
配体L(1)在罕见的C,N,N三齿模式下与Ln(3+)离子配位。配合物1a与两当量的
2,6-二异丙基苯胺反应很容易,得到相应的双酰胺配合物[(HL(1))LnY(NHC(6)H(3)iPr(2)-2,6)(2) ](2)选择性地,即苯基的CH活化是可逆的。当1 a暴露在湿气中时,分离出
水解的二聚体复合物[(HL(1))Y(OH)}(2)](OH)(2