Tungsten(VI) oxytetrachloride

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Tungsten(VI) oxytetrachloride
Tungsten oxytetrachloride
Other names
Tungsten(IV) chloride oxide
3D model (JSmol)
ECHA InfoCard 100.033.497
Molar mass 341.651 g/mol
Appearance red crystals
Density 11.92 g/cm3
Melting point 211 °C (412 °F; 484 K)
Boiling point 227.55 °C (441.59 °F; 500.70 K)
Solubility soluble in benzene and CS2
not listed
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tungsten(VI) oxytetrachloride is the inorganic compound with the formula WOCl4. This diamagnetic solid is used to prepare other complexes of tungsten. The orange-coloured compound is soluble in nonpolar solvents but it reacts with alcohols and water and forms adducts with Lewis bases. The solid consists of weakly associated square pyramidal monomers.[1] The compound is classified as an oxyhalide.

WOCl4 is prepared from tungsten trioxide:[2]

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.[3]


  1. ^ Hess, H.; Hartung, H. (1966). "Die Kristallstruktur von Wolframoxidchlorid WOCl4 und Wolframoxidbromid WOBr4". Z. Anorg. Allg. Chem. 34: 157–166. doi:10.1002/zaac.19663440306. 
  2. ^ Nielson, A. J. (1985). "Tungsten and Molybdenum Tetrachloride Oxides". Inorg. Synth. 23: 195–198. doi:10.1002/9780470132548.ch41. 
  3. ^ Hayano, S.; Masuda, T. (1999). "Living Polymerization of [o-(Trifluoromethyl)phenyl]acetylene by WOCl4-Based Catalysts such as WOCl4-n-Bu4Sn-t-BuOH (1:1:1)". Macromolecules. 32: 7344–7348. doi:10.1002/zaac.19663440306.