title: Mono- and bis-amidinate 2,6-xylylimido vanadium chlorides: synthesis, structure, and reactivity.
abstract: Salt metathesis of (2,6-xylylimido) vanadium trichloride (1) with the unsolvated or the TMEDA lithium p-Et benzamidinate complexes (2 and 3, respectively, in 1 : 2 V : Li molar ratio) yields bis[N,N'-bis(trimethylsilyl) p-Et benzamidinate](2,6-xylylimido)VCl (4) as dark brown, diamond-shaped crystals. When equimolar amounts of complexes 1 and 2 are reacted, a mixture of the bis (4) and mono (5) imidovanadium amidinates results. A similar mixture is also obtained by a ligand metathesis reaction of the bis amidinate complex 4 and complex 1. When the synthesis of the mono amidinate 5 is attempted with the TMEDA lithium amidinate complexes 3 or the 3-pyridyl derivative (7) (in 1 : 1 V : Li molar ratio) a redox reaction takes place to produce (kappa(2)-TMEDA)(2,6-xylylimido)V(IV)Cl(2) (6) as crystalline, mustard-yellow plates. The activity of complex 4 in ethylene polymerization was negligible with MAO or MAO\(CPh(3))(+)[B(C(6)F(5))(4)](-) as co-catalysts.
authors.affiliation: Schulich Faculty of Chemistry and Institute of Catalysis Science and Technology, Kyriat Hatechnion, Haifa, 32000, Israel.
authors.forename: Sinai
authors.initials: S
authors.lastname: Aharonovich
authors.forename: Mark
authors.initials: M
authors.lastname: Botoshansky
authors.forename: Boris
authors.initials: B
authors.lastname: Tumanskii
authors.forename: Kotohiro
authors.initials: K
authors.lastname: Nomura
authors.forename: Robert M
authors.initials: RM
authors.lastname: Waymouth
authors.forename: Moris S
authors.initials: MS
authors.lastname: Eisen