Diacetylene

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
Structural formula
Space-filling model
Names
Preferred IUPAC name
Buta-1,3-diyne
Other names
1,3-Butadiyne
Biacetylene
Butadiyne
Identifiers
3D model (JSmol)
1236317
ChEBI
ChemSpider
ECHA InfoCard 100.006.641
EC Number
  • 207-303-9
UNII
  • InChI=1S/C4H2/c1-3-4-2/h1-2H checkY
    Key: LLCSWKVOHICRDD-UHFFFAOYSA-N checkY
  • InChI=1/C4H2/c1-3-4-2/h1-2H
    Key: LLCSWKVOHICRDD-UHFFFAOYAU
  • C#CC#C
Properties
C4H2
Molar mass 50.060 g·mol−1
Appearance Gas
Boiling point 10 °C (50 °F; 283 K)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Highly flammable; Peroxide forming
GHS labelling:
GHS01: ExplosiveGHS02: Flammable
Danger
Safety data sheet (SDS) External MSDS
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

Occurrence

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.

Preparation

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

The bis(trimethylsilyl)-protected derivative may be prepared by the Hay coupling of (trimethylsilyl)acetylene:[2]

See also

References
  1. Verkruijsse, H. D.; Brandsma, L. (1991). "A Detailed Procedure for the Preparation of Butadiyne". Synthetic Communications. 21 (5): 657. doi:10.1080/00397919108020833.
  2. Graham E. Jones, David A. Kendrick, and Andrew B. Holmes (1987). "1,4-Bis(trimethylsilyl)buta-1,3-diyne". Organic Syntheses. 65: 52. doi:10.15227/orgsyn.065.0052.{{cite journal}}: CS1 maint: multiple names: authors list (link)

Further reading
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