Hexamethyldisiloxane

Hexamethyldisiloxane
Names
	Preferred IUPAC name Hexamethyldisiloxane
	Other names Bis(trimethylsilyl) ether; Bis(trimethylsilyl) oxide;
Identifiers
CAS Number	107-46-0 ;
3D model (JSmol)	Interactive image;
Abbreviations	HMDSO, (TMS)2O
Beilstein Reference	1736258
ChEBI	CHEBI:78002 ;
ChemSpider	23150 ;
ECHA InfoCard	100.003.176
EC Number	203-492-7;
MeSH	Hexamethyldisiloxane
PubChem CID	24764;
RTECS number	JM9237000;
UNII	D7M4659BPU ;
UN number	1993
CompTox Dashboard (EPA)	DTXSID4026769 ;
	InChI InChI=1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3 Key: UQEAIHBTYFGYIE-UHFFFAOYSA-N ; InChI=1/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3 Key: UQEAIHBTYFGYIE-UHFFFAOYAL;
	SMILES O([Si](C)(C)C)[Si](C)(C)C;
Properties
Chemical formula	C6H18OSi2
Molar mass	162.379 g·mol−1
Appearance	Colourless liquid
Density	0.764 g·cm−3
Melting point	−59 °C (−74 °F; 214 K)
Boiling point	100 to 101 °C (212 to 214 °F; 373 to 374 K)
Solubility in water	930.7±33.7 ppb (23 °C)
Vapor pressure	43 hPa (20 °C)
Refractive index (nD)	1.377
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Highly flammable liquid and vapour; Causes serious eye irritation;
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H410
Precautionary statements	P210, P233, P240, P273, P403+P235
NFPA 704 (fire diamond)	1 4 0
Flash point	−1(1) °C
Related compounds
Related compounds	Disiloxane; Tetramethylsilane; Dimethyl ether; Bis(trimethylsilyl)amine; Tetrakis(trimethylsilyloxy)silane;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Hexamethyldisiloxane (HMDSO or MM) is an organosilicon compound with the formula O[Si(CH₃)₃]₂. This volatile colourless liquid is used as a solvent and as a reagent in organic synthesis. It is prepared by the hydrolysis of trimethylsilyl chloride. The molecule is the protypical disiloxane and resembles a subunit of polydimethylsiloxane.

Names


Preferred IUPAC name Hexamethyldisiloxane
Other names Bis(trimethylsilyl) ether Bis(trimethylsilyl) oxide
Identifiers
CAS Number	107-46-0^Y
3D model (JSmol)	Interactive image
Abbreviations	HMDSO, (TMS)₂O
Beilstein Reference	1736258
ChEBI	CHEBI:78002^N
ChemSpider	23150^Y
ECHA InfoCard	100.003.176
EC Number	203-492-7
MeSH	Hexamethyldisiloxane
PubChem CID	24764
RTECS number	JM9237000
UNII	D7M4659BPU^Y
UN number	1993
CompTox Dashboard (EPA)	DTXSID4026769
InChI InChI=1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3^Y Key: UQEAIHBTYFGYIE-UHFFFAOYSA-N^Y InChI=1/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3 Key: UQEAIHBTYFGYIE-UHFFFAOYAL
SMILES O([Si](C)(C)C)[Si](C)(C)C
Properties
Chemical formula	C₆H₁₈OSi₂
Molar mass	162.379 g·mol⁻¹
Appearance	Colourless liquid
Density	0.764 g·cm⁻³
Melting point	−59 °C (−74 °F; 214 K)
Boiling point	100 to 101 °C (212 to 214 °F; 373 to 374 K)
Solubility in water	930.7±33.7 ppb (23 °C)
Vapor pressure	43 hPa (20 °C)
Refractive index (n_D)	1.377
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Highly flammable liquid and vapour Causes serious eye irritation
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H410
Precautionary statements	P210, P233, P240, P273, P403+P235
NFPA 704 (fire diamond)	1 4 0
Flash point	−1(1) °C
Related compounds
Related compounds	Disiloxane Tetramethylsilane Dimethyl ether Bis(trimethylsilyl)amine Tetrakis(trimethylsilyloxy)silane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references