Tungsten(VI) oxytetrachloride is the inorganic compound with the formula WOCl4. This diamagnetic solid is used to prepare other complexes of tungsten. The yellow-green compound is soluble in nonpolar solvents but it reacts with alcohols and water and forms adducts with Lewis bases. Structure The solid consists of weakly associated square pyramidal monomers. The compound is classified as an oxyhalide. Synthesis and reactions WOCl4 is prepared from tungsten trioxide: WO3 + 2 SOCl2 → WOCl4 + 2 SO2 WCl6 + (Me3Si)2O → WOCl4 + 2 Me3SiCl WOCl4 is Lewis acidic. It is a precursor to catalysts used for polymerization of alkynes. References Chlorides Metal halides Oxychlorides Tungsten compounds