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Octatetraynyl radical
Names
	Preferred IUPAC name Octa-1,3,5,7-tetrayn-1-yl
Identifiers
3D model (JSmol)	Interactive image; anion: Interactive image;
ChemSpider	10809239 ;
PubChem CID	57417316; anion: 100986430;
	InChI InChI=1S/C8H/c1-3-5-7-8-6-4-2/h1H Key: GTEOCQSGHJLKQX-UHFFFAOYSA-N ; anion: InChI=1S/C8H/c1-3-5-7-8-6-4-2/h1H/q-1 Key: JPYHXIJMECKQLV-UHFFFAOYSA-N;
	SMILES [C]#CC#CC#CC#C; anion: [C-]#CC#CC#CC#C;
Properties
Chemical formula	C8H
Molar mass	97.096 g·mol−1
	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

Octatetraynyl radical (C₈H) is an organic free radical with eight carbon atoms linked in a linear chain with alternating single bonds and triple bonds (H−C≡C−C≡C−C≡C−C≡C•).

In 2007 negatively charged octatetraynyl was detected in Galactic molecular source TMC-1, making it the second type of anion to be found in the interstellar medium (after hexatriynyl radical) and the largest such molecule detected to date.^[1]^[2]

References

^ Remijan, Anthony J.; J. M. Hollis; F. J. Lovas; M. A. Cordiner; T. J. Millar; A. J. Markwick-Kemper; P. R. Jewell (July 20, 2007). "Detection of C₈H⁻ and Comparison with C₈H toward IRC +10 216". The Astrophysical Journal. 664 (1): L47–L50. Bibcode:2007ApJ...664L..47R. doi:10.1086/520704.
^ Brünken, S.; H. Gupta; C. A. Gottlieb; M. C. McCarthy; P. Thaddeus (July 20, 2007). "Detection of the Carbon Chain Negative Ion C₈H⁻ in TMC-1". The Astrophysical Journal. 664 (1): L43–L46. Bibcode:2007ApJ...664L..43B. doi:10.1086/520703. S2CID 120912943.