Reactions between an Ethylene Oligomerization Chromium(III) Precatalyst and Aluminum-Based Activators: Alkyl and Cationic Complexes with a Tridentate NPN Ligand
文献类型：期刊论文
| 作者 | Liu, Shaofeng1,2,3; Pattacini, Roberto1; Braunstein, Pierre1 |
| 刊名 | ORGANOMETALLICS
 |
| 出版日期 | 2011-07-11 |
| 卷号 | 30期号:13页码:3549-3558 |
| ISSN号 | 0276-7333 |
| DOI | 10.1021/om200243a |
| 英文摘要 | To gain a deeper knowledge of the nature of the species formed in situ by reaction of a catalyst precursor complex and typical cocatalysts used for ethylene oligomerization or polymerization, the Cr(III) complex fac-[Cr(NPN)Cl-3] (1; NPN = bis(2-picolyl)phenylphosphine) was reacted with MAO and partial methylation to give the mononuclear complex fac-[Cr(NPN)Cl2.23Me0.77] (2) was observed, whereas reaction with AlMe3 in toluene led to partial halide abstraction and produced the dinuclear, chloride-bridged dicationic complex [{fac-Cr(NPN)Me(mu-Cl)}(2)] [AlMexCl4-x](2) (3. [AlMexCl4-x]2), in which the metal centers are bridged by two chloride ligands. The complex fac-[Cr(NPN)Cl2Et] (4) was isolated in high yield from the reaction of 1 with AlEt3 and contains a rare example of Cr-III-Et function. Upon treatment of 1 with EtAlCl2, the dinuclear Cr(III) complex [{fac-Cr(NPN)}(2)(mu-Cl)(3)][AlCl4](3)center dot(5 center dot[AlCl4](3)) was obtained, which contains three bridging chlorides. Thus, under the conditions investigated, MAO and AlEt3 behaved as alkylation agents, whereas AlMe3 and EtAlCl2 reacted as cationization agents. On activation with MAO and under comparable conditions, 1-5 exhibited similar catalytic properties, with activities between 2700 and 2800 g of C2H4/((g of Cr) h), but the major oligomer produced using the 4/MAO system was 1-decene. The neutral alkyl complexes 2 and 4 and the cationic complexes 3 and 5 did not exhibit catalytic activity for ethylene oligomeriz,ation in the absence of MAO. The structures of the complexes 2, 3 [AlMeCl4-x](2), 4, and 5 center dot[AlCl4](3) have been determined by singlecrystal X-ray diffraction. |
| 语种 | 英语 |
| WOS记录号 | WOS:000292417900018 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/72675]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Braunstein, Pierre |
| 作者单位 | 1.Univ Strasbourg, Lab Chim Coordinat, Inst Chim, CNRS,UMR 7177, F-67081 Strasbourg, France 2.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Shaofeng,Pattacini, Roberto,Braunstein, Pierre. Reactions between an Ethylene Oligomerization Chromium(III) Precatalyst and Aluminum-Based Activators: Alkyl and Cationic Complexes with a Tridentate NPN Ligand[J]. ORGANOMETALLICS,2011,30(13):3549-3558. |
| APA | Liu, Shaofeng,Pattacini, Roberto,&Braunstein, Pierre.(2011).Reactions between an Ethylene Oligomerization Chromium(III) Precatalyst and Aluminum-Based Activators: Alkyl and Cationic Complexes with a Tridentate NPN Ligand.ORGANOMETALLICS,30(13),3549-3558. |
| MLA | Liu, Shaofeng,et al."Reactions between an Ethylene Oligomerization Chromium(III) Precatalyst and Aluminum-Based Activators: Alkyl and Cationic Complexes with a Tridentate NPN Ligand".ORGANOMETALLICS 30.13(2011):3549-3558. |
入库方式： OAI收割
来源：化学研究所
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