367501-75-5Relevant academic research and scientific papers
Coordinatively unsaturated W(IV)-bis(pyridine) complexes, a reactive source of W(IV)
Mills,Wang,Abboud,Boncella
, p. 5077 - 5082 (2008/10/08)
Addition of 2 equiv of a σ-donor ligand (L = pyridine, 4-picoline, or quinoline) to complexes of the type [W(NPh)(η4-arene)(o-(Me3SiN)2C 6H4)] (arene = CH3CH2C6H5 (3), CH3CH2CH2C6H5 (4)) gave the W(IV)L2 compounds, [W(NPh)(o-(Me3SiN)2C6H4)(C 5H5N)2] (5), [W(NPh)(o-(Me3SiN)2C6H4)(p-C 6H7N)2] (6), and [W(NPh)(o-(Me3SiN)2C6H4)(C 9H7N)2] (7). Synthesis of compounds 5 and 6 by Na° reduction of [W(NPh)(o-(Me3SiN)2C6H4)Cl 2] in the presence of 3 equiv of L (L = 5, pyridine or 6, 4-picoline) is also presented. Compounds 5, 6, and 7 display hindered rotation of the donor ligands about the W-N bonds, resulting from a steric interaction with the Me3Si groups of the diamide ligand. The coordinative unsaturation of 5 and 6 has also been explored. Compounds 5 and 6 readily react with either CO and PMe3 to generated the six coordinate complexes [W(NPh)(o-(Me3SiN)2C6H4)(C 5H5N)2(CO)] (8a), [W(NPh)(o-(Me3SiN)2C6H4)(C 6H7N)2(CO)] (8b), [W(NPh)(o-(Me3SiN)2C6H4)(C 6H5N)(PMe3)2] (10a), and [W(NPh)(o-(Me3SiN)2C6H4)(C 6H7N)(PMe3)2] (10b), respectively.
