Zirconocene-catalyzed dimerization of 1-hexene: Two-stage activation and structure–catalytic performance relationship
作者:Ilya E. Nifant'ev、Alexey A. Vinogradov、Alexander A. Vinogradov、Pavel V. Ivchenko
DOI:10.1016/j.catcom.2016.02.013
日期:2016.4
The dimerization of 1-hexene was catalyzed by ten zirconocenes. High catalytic productivity was achieved via a two-step activation process, namely, the treatment of the zirconocene with triisobutylaluminum (TIBA) followed by methylaluminoxane (MAO). The zirconocene [(C5H4SiMe2)2O]ZrCl2 (10) exhibits a higher productivity and selectivity to dimer formation than the unsubstituted (C5H5)2ZrCl2 (1) complex
1-己烯的二聚反应被十种茂茂金属催化。通过两步活化过程,即先用三异丁基铝(TIBA)然后用甲基铝氧烷(MAO)处理锆茂,实现了高催化生产率。锆茂[[C 5 H 4 SiMe 2)2 O] ZrCl 2(10)与未取代的(C 5 H 5)2 ZrCl 2(1)配合物相比,具有更高的生产率和对二聚体形成的选择性。对于ansa- [Z(C 5 H 4)2 ] ZrCl 2配合物,催化活性随环戊二烯基环之间的角度减小而增加。当使用Et 2 AlCl作为形成催化物质所需的氯源进行反应时,二聚选择性10达到94%。讨论了选择性α-烯烃二聚的可能机理。