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Issue 24, 2010
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Mono- and bis-amidinate 2,6-xylylimido vanadium chlorides: synthesis, structure, and reactivity

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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 2-TMEDA)(2,6-xylylimido)VIVCl2 (6) as crystalline, mustard-yellow plates. The activity of complex 4 in ethylene polymerization was negligible with MAO or MAO\(CPh3)+[B(C6F5)4] as co-catalysts.

Graphical abstract: Mono- and bis-amidinate 2,6-xylylimido vanadium chlorides: synthesis, structure, and reactivity

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Publication details

The article was received on 09 Dec 2009, accepted on 14 Apr 2010 and first published on 17 May 2010


Article type: Paper
DOI: 10.1039/B925974K
Citation: Dalton Trans., 2010,39, 5643-5649
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    Mono- and bis-amidinate 2,6-xylylimido vanadium chlorides: synthesis, structure, and reactivity

    S. Aharonovich, M. Botoshansky, B. Tumanskii, K. Nomura, R. M. Waymouth and M. S. Eisen, Dalton Trans., 2010, 39, 5643
    DOI: 10.1039/B925974K

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