Cyclo(6)carbon

Cyclo[6]carbon is an allotrope of carbon with molecular formula C6. The molecule is a ring of six carbon atoms, connected by alternating double bonds.[1] It is, therefore, a member of the cyclo[n]carbon family.

Cyclo(6)carbon
Names
Preferred IUPAC name
Hexadehydrobenzene
Identifiers
3D model (JSmol)
  • InChI=1S/C6/c1-2-4-6-5-3-1 N
    Key: PXCDDPIOUAJVRE-UHFFFAOYSA-N N
  • Alternating form: C1#CC#CC#C1
  • Cumulene form: C1=C=C=C=C=C=1
Properties
C6
Molar mass 72.066 g·mol−1
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

There have been a few attempts to synthesize cyclo[6]carbon, e.g. by pyrolysis of mellitic anhydride,[2] but without success until 2023, when it was successfully synthesized by atom manipulation of hexachlorobenzene.[1]

Calculations suggest that the alternative cyclic cumulene structure, called cyclohexahexaene, is the potential energy minimum of the cyclo[6]carbon framework.[3]

References
  1. Xu, Wei; Sun, Luye; Zheng, Wei; Gao, Wenze; Kang, Faming (2023-10-05), On-surface synthesis of anti-aromatic cyclo[12]carbon and aromatic cyclo[6]carbon, doi:10.21203/rs.3.rs-3411973/v1
  2. Fields, Ellis K.; Meyerson, Seymour (October 1966). "Arynes by Pyrolysis of Acid Anhydrides". J. Org. Chem. 31 (10): 3307–3309. doi:10.1021/jo01348a046.
  3. Zahradník, Rudolf; Hobza, Pavel; Burcl, Rudolf; Andes Hess, B. (October 1994). "Strained unsaturated molecules. Theoretical study of acyclic and cyclic cumulenes and acetylenes". Journal of Molecular Structure: THEOCHEM. 313 (3): 335–349. doi:10.1016/0166-1280(94)85015-1.
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