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Structural formula
Space-filling model
Preferred IUPAC name
Other names
  • 460-12-8 ☑Y
3D model (JSmol)
  • Interactive image
  • CHEBI:37820 ☑Y
  • 9603 ☑Y
ECHA InfoCard 100.006.641
PubChem CID
  • 9997
Molar mass 50.06 g·mol−1
Appearance Gas
Boiling point 10 °C (50 °F; 283 K)
Main hazards Highly flammable
Safety data sheet External MSDS
R-phrases (outdated) R11 R19
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Diacetylene (also known as butadiyne) is the organic compound with the formula C4H2. It is the simplest compound containing two triple bonds. It is first in the series of polyynes, which are of theoretical but not of practical interest.


Diacetylene has been identified in the atmosphere of Titan and in the protoplanetary nebula CRL 618 by its characteristic vibrational spectrum. It is proposed to arise by a reaction between acetylene and the ethynyl radical (C2H), which is produced when acetylene undergoes photolysis. This radical can in turn attack the triple bond in acetylene and react efficiently even at low temperatures. Diacetylene has also been detected on the Moon.[1]


This compound may be made by the dehydrohalogenation of 1,4-dichloro-2-butyne by potassium hydroxide (in alcoholic medium) at ~70°C:[2]

ClCH2C≡CCH2Cl + 2 KOH → HC≡C−C≡CH + 2 KCl + 2 H2O

The bis(trimethylsilyl)-protected derivative may be prepared by the Hay coupling of (trimethylsilyl)acetylene:[3]

2 Me3Si−C≡CH → Me3Si−C≡C−C≡C−SiMe3

See also


  1. ^ "The Multiplying Mystery of Moonwater", March 18, 2010. Retrieved on 2010-03-18.
  2. ^ Verkruijsse, H. D.; Brandsma, L. (1991). "A Detailed Procedure for the Preparation of Butadiyne". Synthetic Communications. 21 (5): 657. doi:10.1080/00397919108020833.
  3. ^ Graham E. Jones, David A. Kendrick, and Andrew B. Holmes (1993). "1,4-Bis(trimethylsilyl)buta-1,3-diyne". Organic Syntheses. doi:10.15227/orgsyn.065.0052.; Collective Volume, 8, p. 63

Further reading

  • Maretina, Irina A; Trofimov, Boris A (2000). "Diacetylene: a candidate for industrially important reactions". Russian Chemical Reviews. 69 (7): 591. doi:10.1070/RC2000v069n07ABEH000564.
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