Tetraethylene glycol dimethyl ether

Tetraethylene glycol dimethyl ether
Names
	Preferred IUPAC name 2,5,8,11,14-Pentaoxapentadecane
	Other names Bis[2-(2-methoxyethoxy)ethyl] ether, Tetraglyme, Dimethoxytetraglycol
Identifiers
CAS Number	143-24-8 ;
3D model (JSmol)	Interactive image;
Abbreviations	TEGDME, tetraglyme, E181
ChEBI	CHEBI:46785 ;
ChemSpider	13835433;
ECHA InfoCard	100.005.086
EC Number	205-594-7;
PubChem CID	8925;
UNII	78L136FLZ9 ;
CompTox Dashboard (EPA)	DTXSID7044396 ;
	InChI InChI=1S/C10H22O5/c1-11-3-5-13-7-9-15-10-8-14-6-4-12-2/h3-10H2,1-2H3 Key: ZUHZGEOKBKGPSW-UHFFFAOYSA-N;
	SMILES COCCOCCOCCOCCOC;
Properties
Chemical formula	C10H22O5
Molar mass	222.281 g·mol−1
Appearance	Colorless liquid
Density	1.009 g/mL
Melting point	−30 °C (−22 °F; 243 K)
Boiling point	275.3 °C (527.5 °F; 548.5 K)
Solubility in water	Miscible
Acidity (pKa)	38
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	1134.6 kJ/mol
Std enthalpy of; combustion (ΔcH⦵298)	6196.5 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Reproductive toxicity
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H360
Precautionary statements	P201, P202, P281, P308+P313, P405, P501
NFPA 704 (fire diamond)	1 1 0
Flash point	141 °C (286 °F; 414 K)
Autoignition; temperature	200 °C (392 °F; 473 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	5,140 mg/kg (rat, oral)
Safety data sheet (SDS)	Fisher Scientific 34316
Related compounds
Related	glycol ethers
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tetraethylene glycol dimethyl ether (TEGDME or tetraglyme) is a polar aprotic solvent with excellent chemical and thermal stability. Its high boiling point and stability makes it an ideal candidate for separation processes and high temperature reactions. TEGDME is also used in lithium-ion battery technology and combined with trifluoroethanol as a working pair for organic absorption heat pumps.^[4]^[5]