Hexa(tert-butoxy)ditungsten(III)

Identifiers

CAS Number

* 57125-20-9

3D model (JSmol)

* Interactive image

ChemSpider |

* 26567629

PubChem CID

* 13634733

InChI

* InChI=1S/6C4H9O.2W/c6*1-4(2,3)5;;/h6*1-3H3;;/q6*-1;2*+3

Key: YKZVERBZIZOWIZ-UHFFFAOYSA-N

SMILES

* CC(C)(C)O[W](#[W](OC(C)(C)C)(OC(C)(C)C)OC(C)(C)C)(OC(C)(C)C)OC(C)(C)C

Properties

Chemical formula

| C24H54O6W2
Molar mass | 806.37 g·mol−1
Appearance  | red solid
Density | 1.651 g/cm3

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Hexa(tert-butoxy)ditungsten(III) is a coordination complex of tungsten(III). It is one of the homoleptic alkoxides of tungsten. 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. It has attracted particular attention for its reactions with alkynes, leading to alkyne metathesis.[1]

It can be prepared by the salt metathesis reaction from the thf complex of ditungsten heptachloride:[2]

NaW2Cl7(THF)5 \+ 6 NaOBu-t → W2(OBu-t)6 \+ 7 NaCl + 5 THF

It was originally prepared by alcoholysis of the amide W2(NMe2)6.[3]

The complex and its dimolybdenum analogue adopt a staggered, ethane-like conformation. The M-M distance is 233 pm.[4] The complex is a weak Lewis acid, forming adducts with two pyridine ligands, for example.[5]

## See also

* Hexa(tert-butoxy)dimolybdenum(III)

## References

1. ↑ Listemann, Mark L.; Schrock, Richard R. (1985). "Multiple metal carbon Bonds. 35. A General Route to tri-tert-Butoxytungsten Alkylidyne complexes. Scission of Acetylenes by Ditungsten Hexa-tert-butoxide". Organometallics 4: 74–83. doi:10.1021/om00120a014.
2. ↑ Broderick, Erin M.; Browne, Samuel C.; Johnson, Marc J. A. (2014). Dimolybdenum and Ditungsten Hexa(Alkoxides). Inorganic Syntheses. 36. pp. 95–102. doi:10.1002/9781118744994.ch18. ISBN 9781118744994.
3. ↑ Chisholm, M. H.; Extine, M. (1975). "New Metalloorganic Compounds of Tungsten(III)". Journal of the American Chemical Society 97 (19): 5625–5627. doi:10.1021/ja00852a074.
4. ↑ Chisholm, Malcolm H.; Gallucci, Judith C.; Hollandsworth, Carl B. (2006). "Crystal and molecular structure of W2(OBut)6 and electronic structure calculations on various conformers of W2(OMe)6". Polyhedron 25 (4): 827–833. doi:10.1016/j.poly.2005.07.010.
5. ↑ Budzichowski, Theodore A.; Chisholm, M.H.; Folting, Kristen; Huffman, John C.; Streib, William E.; Tiedtke, Darin B. (1998). "Pyridine, isocyanide, carbodiimide and allene adducts of hexakis (Trifluoromethyl t-botoxy) ditungsten. A comparison of ligand binding to W2(Ot-Bu)6 and W2(OCMe2CF3)6". Polyhedron 17 (5–6): 857–867. doi:10.1016/S0277-5387(97)00290-8.

* v
* t
* e

Tungsten compounds

Tungsten(0)|

* W(CO)6

Tungsten(II)|

* WSi2
* WCl2
* W(OH)2

Tungsten(III)|

* W2O3

Tungsten(IV)|

* WC
* WO2
* WS2
* WSe2
* WTe2
* WF4
* WCl4

Tungsten(V)|

* W2O5
* WBr5
* W2Cl10

Tungsten(VI)|

* H3PW12O40
* (NH4)10(H2W12O42)
* WO2Cl2
* WCl6
* WF6
* WN2
* WO3
* WS3
* WOBr4
* WOCl4
* WOF4
* H2WO4

| Organotungsten(VI) compounds|

* W(CH3)6

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