(Allyl)zirconium(IV) Complexes with the
<i>N,N′</i>
‐bis(trimethylsilyl)benzamidinato (“siam”) Ligand — Molecular Structures and η
<sup>1</sup>
–η
<sup>3</sup>
Interconversions of the Allyl Groups
作者:Dirk Walther、Reinald Fischer、Manfred Friedrich、Peter Gebhardt、Helmar Görls
DOI:10.1002/cber.19961291113
日期:1996.11
Complexes of the type (siam)2Zr(allyl)2 (1a) and (siam)Zr(allyl)nClm are described (2a: n = 1, m = 2; 2b: n = 2, m = 1; 2c: n = 3, m = 0; siam: N,N′ -bis(trimethylsilyl)benzamidinato group). The molecular structure of 1a shows that both allyl groups are differently bonded. One allyl ligand is η3-, the other η1-coordinated. The X-ray crystal structure of the tris-(allyl) complex 2c shows a chiral molecule
描述了(siam)2 Zr(烯丙基)2(1a)和(siam)Zr(烯丙基)n Cl m类型的络合物(2a:n = 1,m = 2; 2b:n = 2,m = 1; 2c:n= 3,m= 0; siam:N,N'-双(三甲基甲硅烷基)苯甲酰胺基)。1a的分子结构表明两个烯丙基键合不同。一个烯丙基配体是η 3 - ,其他η 1协调。的三(烯丙基)配合物的X射线晶体结构图2c示出了手性分子具有两个η 3 -烯丙基配体。第三allyl配位体配位在η之间的中间模式3和η 1,从而作为模型用于中间的η 3 -η 1个在溶液中观察到烯丙基配体的分子内重排。温度依赖性1 H-和13的C-NMR谱如图1A所示,图2b和图2c表示了快速η 1 -η 360℃下烯丙基的重排。在-50°C下,对于2b和2c,可以观察到烯丙基的两种不同配位模式。