Hexachlorodisiloxane

Identifiers
CAS Number	14986-21-1 Y
3D model (JSmol)	Interactive image
ChemSpider	76449
ECHA InfoCard	100.035.504
EC Number	239-070-4
PubChemCID	84745
CompTox Dashboard(EPA)	DTXSID2065836
InChI InChI=1S/Cl6OSi2/c1-8(2,3)7-9(4,5)6 Key: QHAHOIWVGZZELU-UHFFFAOYSA-N
SMILES O([Si](Cl)(Cl)Cl)[Si](Cl)(Cl)Cl
Properties
Chemical formula	Cl6OSi2
Molar mass	284.87 g·mol−1
Density	1.575 g/cm3
Melting point	−33 °C (−27 °F; 240 K)
Boiling point	137 °C (279 °F; 410 K)
Hazards
GHS labelling:[1]
Pictograms
Signal word	Danger
Hazard statements	H223,H314,H335
Related compounds
Otheranions	Hexafluorodisiloxane
Othercations	Perchloromethylether
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). Infobox references

Hexachlorodisiloxane is a chemical compound composed ofchlorine,silicon, andoxygen. Structurally, it is the symmetricalether of twotrichlorosilyl groups, and can be synthesized via high-temperature oxidation ofsilicon tetrachloride:$${\displaystyle 2{\text{SiCl}}_4^{}+{\text{O}}_2^{}\stackrel{\genfrac{}{}{0ex}{}{}{950-970{}^{\circ }\text{C}}}{\to }2{({\text{SiCl}}_3^{})}_2^{}\text{O}+{\text{Cl}}_2^{}}$$

At room temperature, it is a colorless liquid that hydrolyzes upon exposure to water to givesilicon dioxide andhydrochloric acid:$${\displaystyle {({\text{SiCl}}_3^{})}_2^{}\text{O}+3{\text{H}}_2^{}\text{O}⟶2{\text{SiO}}_2^{}+6\text{HCl}}$$ Intense heat evinces a similar decomposition:$${\displaystyle 2{({\text{SiCl}}_3^{})}_2^{}\text{O}\stackrel{\genfrac{}{}{0ex}{}{}{\mathrm{\Delta }}}{\to }{\text{SiO}}_2^{}+3{\text{SiCl}}_4^{}}$$

Reaction withantimony trifluoride gives the analogous hexafluorodisiloxane.

• 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). Vol. 3. Moscow: Mir. p. 392.
• K. A. Adrianov [Адрианов К. А.] (1955).Кремнийорганические соединения [Organosilicon Compounds] (in Russian). Moscow: State scientific and technical publishing house of chemical literature. p. 521.
• Booth, Harold Simmons; Osten, Reuben Alexander (July 1945). "The Fluorination of Chlorodisiloxane / Silicon Oxyfluoride".Journal of the American Chemical Society.67 (7):1092–1096.doi:10.1021/ja01223a021.

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