Synthesis of (Imido)Vanadium(V) Dichloride Complexes Containing Anionic N-Heterocyclic Carbenes That Contain a Weakly Coordinating Borate Moiety: New MAO-Free Ethylene Polymerization Catalysts

详细信息    查看全文

• 作者：Atsushi Igarashi ; Eugene L. Kolychev ; Matthias Tamm ; Kotohiro Nomura
• 刊名：Organometallics
• 出版年：2016
• 出版时间：June 13, 2016
• 年：2016
• 卷：35
• 期：11
• 页码：1778-1784
• 全文大小：407K
• 年卷期：0
• ISSN：1520-6041

文摘

Synthesis and structural analysis of (imido)vanadium(V) complexes containing anionic N-heterocyclic carbenes with a weakly coordinating borate [B(C₆F₅)₃] moiety (WCA-NHC) of the type [V(NR)Cl₂(WCA-NHC)] [R = 1-adamantyl, C₆H₅, 2,6-Me₂C₆H₃; NHC = 1,3-bis(2,6-dimethylphenyl)imidazolin-2-ylidene] have been explored; the WCA-NHC forms a σ-bond with vanadium as alkyl ligand (without strong π-donation) on the basis of crystallographic analysis [V–C_NHC = 2.039(3)–2.049(2) Å]. [V(N-2,6-Me₂C₆H₃)Cl₂(WCA-NHC)] exhibited remarkable catalytic activity (e.g., 11000 kg-PE/mol-V·h) for ethylene polymerization in the presence of AlⁱBu₃, and the activity was much higher than those in the presence of MAO and Et₂AlCl.