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We report the detection, for the first time in space, of a newnon-functionalised hydrocarbon cycle in the direction of TMC-1: o-C6H4(ortho-benzyne). We derive a column density for this hydrocarbon cycle of (5+/- 1)e11 cm-2. The abundance of this species is around 30 times lower thanthat of cyclopentadiene and indene. We compare the abundance of benzyne withthat of other pure hydrocarbons, cycles or chains, and find that it could beformed from neutral-radical reactions such as C2H + CH2CHCCH and C + C5H5, andpossibly through C4H + C2H4, C3H + CH2CCH2, and C3H2 + C3H3. Hence, the richcontent of hydrocarbon cycles observed in TMC-1 could arise through a bottom-upscenario involving reactions of a few radicals with the abundant hydrocarbonsrecently revealed by the QUIJOTE line survey.

Discovery of benzyne, o-C6H4, in TMC-1 with the QUIJOTE line survey