6533b7d8fe1ef96bd126ac89

RESEARCH PRODUCT

Reactions of Tris(ethanediolato)tungsten and Tungsten Oxytetrachloride with Aminotris(phenol)s:  Alkoxide, Chloro, and Alkyl Derivatives of Oxotungsten(VI) Complexes with Tetradentate [O3N]-Type Ligands

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Trisdiolatotungsten(VI) complex [W(eg)3] (eg = 1,2-ethanediolato dianion) reacts in refluxing toluene solution with phenolic ligand precursors tris(2-hydroxy-3,5-dimethylbenzyl)amine (H3LMe) and tris(2-hydroxy-3,5-di-tert-butylbenzyl)amine (H3LtBu) to form monomeric oxotungsten(VI) complexes [WO(LMe)(Heg)] and [WO(LtBu)(Heg)], respectively. These complexes undergo chloride-for-alkoxide substitution when treated with SOCl2 in CH2Cl2, which leads to the formation of corresponding chloro complexes [WO(LMe)Cl] and [WO(LtBu)Cl]. Identical chloro complexes are also formed in the reaction between these phenolic ligand precursors and [WOCl4]. The reaction of [WO(LR)Cl] complexes with Grignard reagents yields corresponding monoalkyl derivatives [WO(LR)(Me)] and [WO(LR)(CH2CMe2Ph)]. These alkyl derivatives are stable in ambient atmosphere. All new compounds are mononuclear molecules, in which the tripodal aminotris(phenolate) group has coordinated as a tetradentate ligand through three oxygen donors and one nitroge...