文献类型：期刊文献

英文题名：Switchable Ethylene Tri-/Tetramerization with High Activity: Subtle Effect Presented by Backbone-Substituent of Carbon-Bridged Diphosphine Ligands

作者：Zhang, Jun[1,2];Wang, Xiao[1,2];Zhang, Xuejun[1,2];Wu, Weijie[1,2];Zhang, Gengtao[1,2];Xu, Sheng[1,2];Shi, Min[1,2,3]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Organometall Chem, Shanghai 200032, Peoples R China

年份：2013

卷号：3

期号：10

起止页码：2311

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20134216859269);WOS:【SCI-EXPANDED(收录号:WOS:000326320000019)】；

基金：Financial Support from Shanghai Pujiang Talent Program (11PJ1402500), the Fundamental Research Funds for the Central Universities (WK1114014), and the National Natural Science Foundation of China (21171056) is greatly acknowledged.

语种：英文

外文关键词：ethylene trimerization; ethylene tetramerization; backbone-substituent; diphosphine ligand; chromium(III) catalysts

摘要：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.