Investigation of 1-hexene isomerization and oligomerization catalyzed with 脙脙脙脙-diketiminato Ni(II) bromide complexes/methylaluminoxane system
- 作者：Zhang ; Junkai ; Gao ; Haiyang ; Ke ; Zhuofeng ; Bao ; Feng ; Zhu ; Fangming ; Wu ; Qing
- 关键词：脙脙脙脙-Diketiminato Ni(II) complexes ; 1-Hexene ; Isomerization ; Oligomerization ; Methylaluminoxane
- 刊名：Journal of Molecular Catalysis. A ; Chemical
- 出版年：2005
- 期刊代码：57_13811169
- 类别：ch
- 出版时间：April 20, 2005
- 卷：231
- 期：1-2
- 页码：27-34
- 文件大小：437 K
摘要
β-Diketiminato Ni(II) bromide complexes were synthesized and used to catalyze isomerization and oligomerization of 1-hexene in the presence of methylaluminoxane (MAO). GC–MS and GC analysis confirmed that the products are mainly hexene isomers and dimer isomers. 3-Hexene isomers, trimers and higher oligomers were not detected. The results were ascribed to the configuration of the β-diketiminato Ni(II) catalyst. The migration of the Ni atom from a secondary or tertiary carbon to another one along the alkyl chain of the Ni-alkyl intermediates is blocked by the coordination wedge of the β-diketiminato ligands. However, the migration of the Ni atom from a primary carbon to the adjacent secondary or tertiary carbon is thermodynamically favored.