Switchable Ethylene Tri-/Tetramerization with High Activity: Subtle Effect Presented by Backbone-Substituent of Carbon-Bridged Diphosphine Ligands
Switchable Ethylene Tri-/Tetramerization with High Activity: Subtle Effect Presented by Backbone-Substituent of Carbon-Bridged Diphosphine Ligands
复制标题
高活性可转换乙烯三聚/四聚：碳桥二膦配体主链取代基的微妙作用
DOI：
10.1021/cs400651h
复制
发表时间：
2013-10-01
期刊：
影响因子：
12.9
通讯作者：
Shi, Min
中科院分区：
文献类型：
--
作者：
Zhang, Jun;Wang, Xiao;Shi, Min
The effect of backbone-substituent of carbon-bridged diphosphine ligands of the types {Ph2PCH(R)CH2PPh2} and {Ph2PC(R)=CHPPh2} on the catalyst performance in ethylene oligomerization has been explored. Cr complex bearing a methyl-substituted diphosphine ligand with saturated linker exhibited the highest selectivity of 64.7% toward 1-octene. Cr complex bearing a tert-butyl-substituted diphosphine ligand with unsaturated linker showed a high activity of 4238 kg/(g Cr/h) at 40 bar and 40 degrees C and achieved a high total selectivity of 79.1% toward valuable 1-hexene and 1-octene. The 1-hexene selectivity could be improved up to 55.2% (19.4% 1-octene) at 20 bar and 80 degrees C: Some of the new complexes are even more active than the well-known most efficient ethylene tri/tetramerization catalyst systems.
