Hexachlorodisiloxane

Hexachlorodisiloxane is a chemical compound composed of chlorine, silicon, and oxygen. Structurally, it is the symmetrical ether of two trichlorosilyl groups, and can be synthesized via high-temperature oxidation of silicon tetrachloride:

2

SiCl

4

+

O

2

→

950

−

970

∘

C

2

(

SiCl

3

)

2

O

+

Cl

2

{\displaystyle {\ce {2SiCl4+O2->[950-970^{\circ }{\text{C}}]2(SiCl3)2O+Cl2}}}

At room temperature, it is a colorless liquid that hydrolyzes upon exposure to water to give silicon dioxide and hydrochloric acid:

(

SiCl

3

)

2

O

+

3

H

2

O

⟶

2

SiO

2

+

6

HCl

{\displaystyle {\ce {(SiCl3)2O + 3H2O -> 2SiO2 + 6HCl}}}

Intense heat evinces a similar decomposition:

2

(

SiCl

3

)

2

O

→

Δ

SiO

2

+

3

SiCl

4

{\displaystyle {\ce {2(SiCl3)2O ->[\Delta] SiO2{}+ 3SiCl4}}}

Reaction with antimony trifluoride gives the analogous hexafluorodisiloxane.

Sources

Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.

G. Brauer [Брауэр Г.], ed. (1985). Руководство по неорганическому синтезу [Guide to Inorganic Synthesis] (in Russian).