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3D model (JSmol)
Molar mass 72.07 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Benzotriyne or cyclo[6]carbon is a hypothetical chemical compound, an allotrope of carbon with molecular formula C6. The molecule is a ring of six carbon atoms, connected by alternating triple and single bonds.[1] It is, therefore, a potential member of the cyclo[n]carbon family.

There have been a few attempts to synthesize benzotriyne, e.g. by pyrolysis of mellitic anhydride,[2] but without success as of 2011.

Recent investigations have concluded that benzotriyne is unlikely to exist due to the large angle strain.[citation needed] A likely alternative isomer would be a cyclic cumulene called cyclohexahexaene, which should itself be a metastable species.


  1. ^ Adamson, George A.; Rees, Charles W. (1996). "Towards the total synthesis of cyclo[n]carbons and the generation of cyclo[6]carbon". J. Chem. Soc., Perkin Trans. 1 (13): 1535–1543. doi:10.1039/P19960001535.
  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.