Ethynol

Not to be confused with ethanol or Vinyl alcohol.

Ethynol (or hydroxyacetylene, ethynyl alcohol) is an alkyne–alcohol (ynol) with the formula C₂H₂O. It is the much-less-stable tautomer of ethenone.

Ethynol

Structural formula of ethynol Spacefill model of ethynol
Names
Systematic IUPAC name Ethynol[1]
Other names Ynol, ethynyl alcohol, hydroxyacetylene
Identifiers
CAS Number	32038-79-2 Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	110037 N
PubChem CID	123441
CompTox Dashboard (EPA)	DTXSID90185855
InChI InChI=1S/C2H2O/c1-2-3/h1,3H N Key: QFXZANXYUCUTQH-UHFFFAOYSA-N N
SMILES OC#C C#CO
Properties
Chemical formula	C2H2O
Molar mass	42.037 g·mol−1
Density	0.981 g·cm−3
Boiling point	77.1 °C (170.8 °F; 350.2 K) @ 760mmHg
Hazards
Flash point	14.7 °C (58.5 °F; 287.8 K)
Thermochemistry
Std enthalpy of formation (ΔfH⦵298)	41.6 kJ mol−1
Related compounds
Related compounds	Propargyl alcohol
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

At low temperature in a solid argon matrix it is possible to tautomerise ethenone to form ethynol.^[2][3]

See also

• Ethanol (ethyl alcohol)
• Ethenol (vinyl alcohol)
• Acetylenediol