Chromium Ethylene Tri-/Tetramerization Catalysts Supported by Iminophosphine Ligands

被引：2
作者：
Zhao, Xing [1 ,2 ]
Wang, Jihe [1 ,2 ]
Liu, Dongchang [1 ,2 ]
Kong, Weihuan [1 ,2 ]
Zhang, Jun [1 ,2 ]
机构：
[1] East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China
[2] East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China
来源：
ACS OMEGA | 2023年 / 8卷 / 38期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
SELECTIVE TRIMERIZATION; OLIGOMERIZATION; COMPLEXES; TETRAMERIZATION; POLYMERIZATION; PNP; MECHANISM; 1-OCTENE; OLEFIN; TRIMERIZATION/TETRAMERIZATION;
D O I：
10.1021/acsomega.3c03356
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A new class of highly active ethylene tri-/tetramerization chromium catalysts supported by iminophosphine ligands has been studied. The impact of electronic and steric changes of these ligands on selectivity and activity has been investigated by varying P- and/or N-substituents. Upon activation with MMAO, the ligand bearing a P-cyclohexyl group displayed a high activity of 307 kg/(g Cr/h) with a high trimerization selectivity of 92.6%. Decreasing the steric hindrance of N-aryl group led to a decrease in 1-hexene selectivity (74.5%), producing more 1-octene (10.3%). X-ray diffraction analysis verifies that the ligands coordinate with the chromium center in a ?(2)-P,N mode.
引用
收藏
页码：34549 / 34556
页数：8
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