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 & Bis-ethanol
Identifiers
CAS Number	513-85-9 ; 19132-06-0 (2S,3S)-(+) ; 24347-58-8 (2R,3R)-(−) ; 5341-95-7 (2R,3S) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:62064 ;
ChEMBL	ChEMBL2312529;
ChemSpider	257 ;
ECHA InfoCard	100.007.431
EC Number	208-173-6;
PubChem CID	262;
UNII	45427ZB5IJ ; 7E9UXG71S1 (2S,3S)-(+) ; OR02B2286A (2R,3R)-(−) ; F5IA8X9O8M (2R,3S) ;
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). verify (what is ?) 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.