Synthesis and molecular structures of lanthanocene amide complexes and their catalytic activity for addition of amines to nitriles
作者:Tao Cai、Xiaoniu Chen、Fan Xu、Yong Zhang、Yingming Yao、Qi Shen
DOI:10.1016/j.jorganchem.2009.05.011
日期:2009.9
groups, one amide group and one oxygen atom from THF to form a distorted tetrahedron. Complexes I–III and a known complex (CH3C5H4)2YbNiPr2(THF) IV all can serve as the catalysts for addition of amines to nitriles to monosubstituted N-arylamidines. The activity depended on the central metals and amide groups, and the active sequence follows the trend IV ≈ III < I < II.
(CH 3 C 5 H 4)2 LnCl(THF)与NaNHAr在THF中的摩尔比为1:1的反应得到酰胺配合物(CH 3 C 5 H 4)2 LnNHAr(THF)[(Ar = 2,6 -Me 2 C 6 H 3, Ln = Yb(I),Y(III); Ar = 2,6- i Pr 2 C 6 H 3,Ln = Yb(II)]。复杂的I – III是同构的。每个络合物中的中心金属与THF的两个甲基环戊二烯基,一个酰胺基和一个氧原子配位,形成扭曲的四面体。配合物I – III和已知的配合物(CH 3 C 5 H 4)2 YbN i Pr 2(THF)IV都可以用作将胺加成腈到单取代N-芳基idine啶上的催化剂。依赖于中心金属和酰胺基团和活性序列的活性如下趋势IV ≈ III < 我 < II。