Nickel(
<scp>II</scp>
) Compounds Derived from
<i>tripod</i>
Ligands: Efficient Catalysts for the Stereoselective Heterodimerization of Styrene and Propene
作者:Ralf Faissner、Gottfried Huttner
DOI:10.1002/ejic.200200536
日期:2003.6
The tripod ligands RCH2C(CH2X)(CH2Y)(CH2Z) form tetracoordinate compounds with NiHal2. If two of the donor functions X, Y, Z are phosphanes, square-planar coordination is observed. In contrast, donor sets X,Y,Z = P,N,N or N,N,N form tetrahedral compounds, by P,N or N,N coordination, that are active in the catalysis of olefin oligomerization with MAO as a co-catalyst. These catalyst systems are also
三脚架配体 RCH2C(CH2X)(CH2Y)(CH2Z) 与 NiHal2 形成四配位化合物。如果供体函数 X、Y、Z 中的两个是膦,则观察到方平面配位。相比之下,供体组 X,Y,Z = P,N,N 或 N,N,N 形成四面体化合物,通过 P,N 或 N,N 配位,在以 MAO 为辅酶催化烯烃低聚反应中具有活性-催化剂。这些催化剂体系在烯烃的立体选择性异二聚化中也有活性。通过这些系统共二聚苯乙烯和丙烯导致 4-苯基-2-戊烯几乎完全,区域选择性高达 98% 和 (E)/(Z) 比高达 95:5,超过其他报道的催化剂这个过程。这些催化转化的产物已通过 GC/MS 技术以及分离、纯化合物的 NMR 和 MS 表征。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)