Sulfolane

Sulfolane
Names
	Preferred IUPAC name 1λ6-Thiolane-1,1-dione
	Other names Tetrahydrothiophene 1,1-dioxide; Sulfolane; Tetramethylene sulfone
Identifiers
CAS Number	126-33-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:74794 ;
ChEMBL	ChEMBL3186899;
ChemSpider	29080 ;
ECHA InfoCard	100.004.349
EC Number	204-783-1;
PubChem CID	31347;
RTECS number	XN0700000;
UNII	Y5L06AH4G5 ;
UN number	3334
CompTox Dashboard (EPA)	DTXSID3027037 ;
	InChI InChI=1S/C4H8O2S/c5-7(6)3-1-2-4-7/h1-4H2 Key: HXJUTPCZVOIRIF-UHFFFAOYSA-N ; InChI=1/C4H8O2S/c5-7(6)3-1-2-4-7/h1-4H2 Key: HXJUTPCZVOIRIF-UHFFFAOYAA;
	SMILES C1CCS(=O)(=O)C1;
Properties
Chemical formula	C4H8O2S
Molar mass	120.17 g·mol−1
Appearance	Clear colorless liquid
Density	1.261 g/cm3, liquid
Melting point	27.5 °C (81.5 °F; 300.6 K)
Boiling point	285 °C (545 °F; 558 K)
Solubility in water	miscible
Viscosity	0.01007 Pa·s at 25 °C
Structure
Dipole moment	4.35 D
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302
Precautionary statements	P264, P270, P301+P312, P330, P501
NFPA 704 (fire diamond)	2 1 0
Flash point	165 °C (329 °F; 438 K)
Autoignition; temperature	528 °C (982 °F; 801 K)
Related compounds
Related compounds	Methylsulfonylmethane; Tetrahydrothiophene; Sulfolene
	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

Sulfolane (also tetramethylene sulfone, systematic name: 1λ⁶-thiolane-1,1-dione) is an organosulfur compound, formally a cyclic sulfone, with the formula (CH₂)₄SO₂. It is a colorless liquid commonly used in the chemical industry as a solvent for extractive distillation and chemical reactions. Sulfolane was originally developed by the Shell Oil Company in the 1960s as a solvent to purify butadiene. Sulfolane is a polar aprotic solvent, and it is miscible with water.

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