文献类型：期刊文献

英文题名：Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by alkenylphosphanyl PNP ligands

作者：Zhou, Tao[1];Zuo, Jing[1];Xie, Haojie[1];Zhao, Xing[1];Zhao, Mei-Xin[1];Zhang, Jun[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Mei Long Rd, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, 130 Mei Long Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：53

期号：33

起止页码：14011

外文期刊名：DALTON TRANSACTIONS

收录：;EI(收录号：20243216846109);WOS:【SCI-EXPANDED(收录号:WOS:001284116200001)】；

基金：We are grateful for financial support from the National Natural Science Foundation of China (22071055) and the Fundamental Research Funds for the Central Universities (222201717003).

语种：英文

外文关键词：Catalyst activity - Chromium - Ligands

摘要：A series of novel diphosphinoamine (PNP) ligands bearing a P-alkenyl group were synthesized and applied in chromium-catalyzed selective ethylene tri-/tetramerization by in situ combination of Cr(acac)3 and modified methylalumoxane (MMAO-3A). The ligand substitution and oligomerization conditions have a remarkable influence on the catalytic activity and controllable selectivity. Most of these PNP ligands are highly active for ethylene tri-/tetramerization with considerable selectivity. An asymmetric diisopropenylphosphanyl ligand with an N-cyclohexyl group achieved the highest activity of 2036 kg (g Cr h-1)-1 with a high total selectivity of 81.1 wt% toward valuable 1-hexene (43.0 wt%) and 1-octene (38.1 wt%) at 40 bar ethylene and 60 degrees C. An asymmetric mixed isopropenyl/ethylphosphanyl ligand with an N-isopropyl group exhibited a high 1-octene selectivity of 65.5 wt% and a high total 1-hexene/1-octene selectivity (91.5 wt%) with a high activity of 1256 kg (g Cr h-1)-1. A series of novel diphosphinoamine (PNP) ligands bearing a P-alkenyl group were synthesized and applied in chromium-catalyzed selective ethylene tri-/tetramerization, most of which are highly active with considerable selectivities.