1,2-Butanediol

1,2-Butanediol
Names
	Preferred IUPAC name Butane-1,2-diol
	Other names 1,2-Dihydroxybutane; α-Butylene glycol
Identifiers
CAS Number	584-03-2 ; 40348-66-1 (R) ; 73522-17-5 (S) ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:52682 ;
ChemSpider	10948 ;
ECHA InfoCard	100.008.663
EC Number	209-527-2;
PubChem CID	11429;
RTECS number	EK0380000;
UNII	RUN0H01QEU ;
CompTox Dashboard (EPA)	DTXSID6040375 ;
	InChI InChI=1S/C4H10O2/c1-2-4(6)3-5/h4-6H,2-3H2,1H3 Key: BMRWNKZVCUKKSR-UHFFFAOYSA-N ; 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 (ΔfH⦵298)	−532.8 kJ/mol
Std enthalpy of; combustion (ΔcH⦵298)	−2479 kJ/mol
Hazards
Flash point	90 °C (194 °F; 363 K)
Safety data sheet (SDS)	ICSC 0395
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). verify (what is ?) Infobox references

1,2-Butanediol is the organic compound with the formula HOCH₂(HO)CHCH₂CH₃. It is classified as a vic-diol (glycol). It is chiral, although typically it is encountered as the racemic mixture. It is a colorless liquid.

Names


Preferred 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 (JSmol)	Interactive image Interactive image
ChEBI	CHEBI:52682^Y
ChemSpider	10948^Y
ECHA InfoCard	100.008.663
EC Number	209-527-2
PubChem CID	11429
RTECS number	EK0380000
UNII	RUN0H01QEU^Y
CompTox Dashboard (EPA)	DTXSID6040375
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 (n_D)	1.4378 (20 °C)
Viscosity	7.3 mPa·s (20 °C)
Thermochemistry
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−532.8 kJ/mol
Std enthalpy of combustion (Δ_cH^⦵₂₉₈)	−2479 kJ/mol
Hazards
Flash point	90 °C (194 °F; 363 K)
Safety data sheet (SDS)	ICSC 0395
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 verify (what is ^YN ?) Infobox references