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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–CNHC = 2.039(3)–2.049(2) A]. [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.

organometallics

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