Influence of the order of introduction of protonic acids on the formation of active complexes in the Ni(PPh3)4/BF3 · OEt2 catalytic system |
| |
| Authors: | V V Saraev P B Kraikivskii D A Matveev A I Vil’ms S N Zelinskii K Lammertsma |
| |
| Institution: | (1) Irkutsk State University, Irkutsk, 664033, Russia;(2) Vrije University, Amsterdam, the Netherlands |
| |
| Abstract: | The influence of the order of introduction of promoters (complex protonic acids) on the formation of active complexes in the Ni(PPh3)4/BF3 · OEt2 catalytic system and the activity of these systems in ethylene oligomerization have been studied. The activity of the systems in which nickel exists mainly as cationic Ni(I) complexes is more than one order of magnitude higher than the activity of the systems where nickel exists mainly in the form of Ni(II) hydride complexes. The role of alcohols as promoters in the Ni(PPh3)4/BF3 · OEt2 catalytic system is elucidated. The alcohols are the source of Ni(II) hydrides and, more importantly, the source of strong Brønsted acids, which efficiently ensure the coordinative unsaturation of the cationic Ni(I) complexes. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
