Sulfolane

Sulfolane
	Carbon, C Hydrogen, H Oxygen, O Sulfur, S
Names
	Preferred IUPAC name 1𝜆6-Thiolane-1,1-dione
	Other names Sulfolane; Tetrahydrothiophene 1,1-dioxide; 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	(CH2)4SO2
Molar mass	120.17 g·mol−1
Appearance	Colorless liquid
Density	1.261 g/cm3, liquid
Melting point	20–26 °C (68–79 °F; 293–299 K)
Boiling point	285 °C (545 °F; 558 K); 104 °C (219 °F; 377 K) (0.2 mmHg); (decomposes at 220 °C (428 °F; 493 K))
Solubility in water	100 g/L
log P	< 0 (20 °C (68 °F; 293 K))
Vapor pressure	0.01 mmHg (20 °C (68 °F; 293 K))
Viscosity	10.34 mPa·s (30 °C (86 °F; 303 K))
Structure
Dipole moment	4.35 D
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H360, H373
Precautionary statements	P201, P202, P260, P264, P270, P280, P301+P312+P330, P308+P313, P405, P501
NFPA 704 (fire diamond)	2 1 0
Flash point	177 °C (351 °F; 450 K)
Autoignition; temperature	528 °C (982 °F; 801 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	1900 mg/kg (oral, mouse); >2000 mg/kg (dermal, rat);
LC50 (median concentration)	12 mg/L (inhalation, rat, 4h)
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 (C H₂)₄S O₂. 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.