New Iminophosphonamide Chromium(II) Complexes as Highly Active Polymer-Free Ethylene Oligomerization Catalysts

被引:17
作者
Albahily, Khalid [1 ]
Ahmed, Zeeshan [1 ]
Gambarotta, Sandro [1 ]
Koc, Ece [2 ]
Duchateau, Robbert [2 ]
Korobkov, Ilia [3 ]
机构
[1] Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada
[2] Eindhoven Univ Technol, Dept Chem Engn & Chem, NL-5600 MB Eindhoven, Netherlands
[3] Fac Sci, Xray Core Facil, Ottawa, ON K1N 6N5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
SELECTIVE TRIMERIZATION; TRIAZACYCLOHEXANE COMPLEXES; ETHENE TRIMERIZATION; OXIDATION-STATE; OLEFINS; TETRAMERIZATION; MECHANISM; LIGANDS; ROUTE;
D O I
10.1021/om2008474
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The reactions of the deprotonated form of cis-{[(mu-N)(t-Bu)](2)PN(H) (o-OMeC6H4)](2)} (a) with either CrCl2(THF)(2) or CrCl3(THF)(3) afforded the corresponding dimeric Cr(II) and monomeric Cr(III) complexes {cis-[(mu-N)(t-Bu)](2)[PN (o-MeOC6H4)](2)Cr}(2) (1a) and cis-[(mu-N)(t-Bu)](2)[PN-2-MeOC6H4](2)CrCl (2a). By replacing the ligand's o-OMeC6H4 groups with less-crowded CH2CH2N(i-Pr)(2) functionalities and reacting the deprotonated form of cis-{[(mu-N)(t-Bu)](2)[PN(H)CH2CH2N(i-Pr)(2))](2)} (b) with CrCl2(THF)(2), the dimetallic, divalent {cis-[(mu-N)(t-Bu)](2)[PNCH2CH2N(i-Pr)(2))](2)Cr}(2) (1b) was obtained in crystalline form. Upon activation with MAO, both la and 1b afforded highly active, polyethylene-free ethylene oligomerization catalysts. Complex 2a is instead catalytically inactive.
引用
收藏
页码:6022 / 6027
页数:6
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