Diacetylene 208217 178420071 2007-12-17T02:01:25Z VVVBot 4099039 robot Adding: [[ru:Диацетилен]] {{Chembox new | ImageFile = Diacetylene.png | ImageSize = | IUPACName = | OtherNames = 1,3-butadiyne, buta-1,3-diyne, biacetylene, butadiyne | Section1 = {{Chembox Identifiers | CASNo = 460-12-8 | PubChem = | SMILES = C#CC#C }} | Section2 = {{Chembox Properties | Formula = C<sub>4</sub>H<sub>2</sub> | MolarMass = 50.046 g/mol | Appearance = Gas | Density = | MeltingPt = -10 °C | BoilingPt = 10 °C | Solubility = }} | Section3 = {{Chembox Hazards | MainHazards = Highly flammable | FlashPt = | Autoignition = | RPhrases = {{R11}} {{R19}} }} }} '''Diacetylene''' (also known as '''butadiyne'''), with the formula C<sub>4</sub>H<sub>2</sub>, is a highly [[alkyne|unsaturated]] [[hydrocarbon]] that contains one [[single bond]] and two [[triple bond]]s. It is the first in the series of [[polyyne]]s. == Occurrence in Nature == Diacetylene has been identified in the atmosphere of [[Titan (moon)|Titan]] and in the [[protoplanetary nebula]] [[CRL 618]] by its characteristic vibrational modes. The molecule is mostly likely to have formed in Titan's atmosphere by a reaction between [[acetylene]] and the [[ethynyl radical]] C<sub>2</sub>H, which is produced when acetylene undergoes [[photolysis]]. This radical can in turn attack the triple bond in acetylene and react efficiently even at cold temperatures. == See also == * [[Acetylene]] * [[Hydrocarbon]] [[Category:Alkynes]] {{hydrocarbon-stub}} [[ru:Диацетилен]]