Hexa(tert-butoxy)ditungsten(III)

A red, air-sensitive solid, the complex has attracted academic attention as the precursor to many organotungsten derivatives.

It an example of a charge-neutral complex featuring a W≡W bond, arising from the coupling of a pair of d3 metal centers.

[2] As verified by X-ray crystallography, the two tungsten(III) centers are joined by a triple bond.

The W2O6 core adopts a staggered, ethane-like conformation, similar to that for its dimolybdenum analogue.

The higher nuclearity of this isopropoxide can be attributed to the smaller size of the isopropoxyl ligands.

The resulting alkylidyne compounds are colorless solids that sublime near room temperature.

Similar reaction with EtC≡CCN and quinuclidine produce different product: W2(O−t−Bu)6 and nitrosobenzene combine to give [W(O-t-Bu)2(NPh)]2(μ-O)(μ-O-t-Bu)2.

[10] Allenes react with the ditungsten complex forming adducts, e.g., Further reaction with carbon monoxide was also demonstrated.