1,2-Butanediol

1,2-Butanediol

Names
IUPAC name Butane-1,2-diol
Other names 1,2-Dihydroxybutane α-Butylene glycol
Identifiers
CAS Number	584-03-2 Y 40348-66-1 (R) N 73522-17-5 (S) N
3D model (Jmol)	Interactive image Interactive image
ChEBI	CHEBI:52682 Y
ChemSpider	10948 Y
ECHA InfoCard	100.008.663
EC Number	209-527-2
RTECS number	EK0380000
UNII	RUN0H01QEU Y
InChI InChI=1S/C4H10O2/c1-2-4(6)3-5/h4-6H,2-3H2,1H3 Y Key: BMRWNKZVCUKKSR-UHFFFAOYSA-N Y InChI=1/C4H10O2/c1-2-4(6)3-5/h4-6H,2-3H2,1H3 Key: BMRWNKZVCUKKSR-UHFFFAOYAV
SMILES OCC(O)CC CCC(CO)O
Properties
Chemical formula	C4H10O2
Molar mass	90.121 g/mol
Density	1.0023 g/cm3 (20 °C)
Melting point	−50 °C (−58 °F; 223 K)
Boiling point	195 to 196.9 °C (383.0 to 386.4 °F; 468.1 to 470.0 K) (96.5 °C at 10 mmHg)
Solubility in water	miscible
Solubility	soluble in ethanol, acetone; sparingly soluble in esters and ethers; insoluble in hydrocarbons
Refractive index (nD)	1.4378 (20 °C)
Viscosity	7.3 mPa s (20 °C)
Thermochemistry
Std enthalpy of formation (ΔfHo298)	−532.8 kJ/mol
Std enthalpy of combustion (ΔcHo298)	−2479 kJ/mol
Hazards
Safety data sheet	ICSC 0395
Flash point	90 °C (194 °F; 363 K)
Related compounds
Related butanediols	1,3-Butanediol 1,4-Butanediol 2,3-Butanediol
Related compounds	Ethylene glycol Propylene glycol 2-Hydroxybutyraldehyde 2-Hydroxybutyric acid α-Ketobutyric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

1,2-Butanediol is a vic-diol (glycol) first described by Charles-Adolphe Wurtz in 1859. It is produced industrially as a byproduct of the production of 1,4-butanediol from butadiene, and is also a byproduct of the catalytic hydrocracking of starches and sugars such as sorbitol to ethylene glycol and propylene glycol. It is used to produce polyester resins and plasticizers, and is a potential feedstock for the industrial production of α-ketobutyric acid, a precursor to many amino acids.