2,3-Butanediol

2,3-Butanediol

Names
Preferred IUPAC name Butane-2,3-diol
Other names 2,3-Butylene glycol Pseudobutylene glycol 2,3-Dihydroxybutane Butan-2,3-diol Diethanol[citation needed] & Bis-ethanol
Identifiers
CAS Number	513-85-9 Y 19132-06-0 (2S,3S)-(+) Y 24347-58-8 (2R,3R)-(−) Y 5341-95-7 (2R,3S) Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:62064 N
ChEMBL	ChEMBL2312529
ChemSpider	257 Y
ECHA InfoCard	100.007.431
EC Number	208-173-6
PubChem CID	262
UNII	45427ZB5IJ Y 7E9UXG71S1 (2S,3S)-(+) Y OR02B2286A (2R,3R)-(−) Y F5IA8X9O8M (2R,3S) Y
CompTox Dashboard (EPA)	DTXSID8041321
InChI InChI=1S/C4H10O2/c1-3(5)4(2)6/h3-6H,1-2H3 Key: OWBTYPJTUOEWEK-UHFFFAOYSA-N
SMILES CC(C(C)O)O
Properties
Chemical formula	C4H10O2
Molar mass	90.122 g·mol−1
Appearance	Colorless liquid
Odor	odorless
Density	0.987 g/mL
Melting point	19 °C (66 °F; 292 K)
Boiling point	177 °C (351 °F; 450 K)
Solubility in water	Miscible
Solubility in other solvents	Soluble in alcohol, ketones, ether
log P	-0.92
Vapor pressure	0.23 hPa (20 °C)
Acidity (pKa)	14.9
Refractive index (nD)	1.4366
Thermochemistry
Heat capacity (C)	213.0 J/K mol
Std enthalpy of formation (ΔfH⦵298)	-544.8 kJ/mol
Hazards
NFPA 704 (fire diamond)	1 1 0
Flash point	85 °C (185 °F; 358 K)
Autoignition temperature	402 °C (756 °F; 675 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose)	5462 mg/kg (rat, oral)
Related compounds
Related butanediols	1,4-Butanediol 1,3-Butanediol
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

2,3-Butanediol is the organic compound with the formula (CH₃CHOH)₂. It is classified as a vic-diol (glycol). It exists as three stereoisomers, a chiral pair and the meso isomer. All are colorless liquids. Applications include precursors to various plastics and pesticides.