1,4-Butynediol

1,4-Butynediol
Names
	Preferred IUPAC name But-2-yne-1,4-diol
	Other names Butynediol; 2-Butyne-1,4-diol; 1,4-Dihydroxy-2-butyne
Identifiers
CAS Number	110-65-6 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:16413 ;
ChEMBL	ChEMBL3187551;
ChemSpider	7775 ;
ECHA InfoCard	100.003.445
EC Number	203-788-6;
KEGG	C02497 ;
PubChem CID	8066;
RTECS number	ES0525000;
UNII	AXH202FPQM;
UN number	2716
CompTox Dashboard (EPA)	DTXSID4021921 ;
	InChI InChI=1S/C4H6O2/c5-3-1-2-4-6/h5-6H,3-4H2 Key: DLDJFQGPPSQZKI-UHFFFAOYSA-N ; InChI=1/C4H6O2/c5-3-1-2-4-6/h5-6H,3-4H2 Key: DLDJFQGPPSQZKI-UHFFFAOYAT;
	SMILES OCC#CCO;
Properties
Chemical formula	C4H6O2
Molar mass	86.090 g·mol−1
Appearance	Colorless crystalline solid
Density	1.11 g/cm3 (at 20 °C)
Melting point	58 °C (136 °F; 331 K)
Boiling point	238 °C (460 °F; 511 K)
Solubility in water	3740 g/L
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H312, H314, H317, H331, H373
Precautionary statements	P260, P261, P264, P270, P271, P272, P280, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P311, P312, P314, P321, P322, P330, P333+P313, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)	2 1 0
Flash point	~136 °C (277 °F)
	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

1,4-Butynediol is an organic compound that is an alkyne and a diol. It is a colourless, hygroscopic solid that is soluble in water and polar organic solvents. It is a commercially significant compound in its own right and as a precursor to other products.

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