Oxotungsten(VI) complexes with amino(phenolate)alcoholate ligand

The reaction between tungsten(VI) complex [W(eg)3] (eg = 1,2-ethanediolato dianion) and a phenolic ligand precursor 2,4-di-tert-butyl-6-(((2-hydroxyethyl)(methyl)amino)methyl)phenol (H2L) affords a monomeric oxotungsten complex [WO(eg)(L)]. This complex reacts further with Me3SiCl, which leads to the displacement of ethanediolato ligand from the complex unit and formation of cis- and trans-isomers of corresponding dichloro complex [WOCl2(L)]. Identical dichloro complexes were also prepared by the reaction between H2L and WOCl4. Molecular structure of [WO(eg)(L)] was verified by X-ray crystallography.