After the report of the tentative detection of ethynylbenzene (C6H5CCH) toward
by Cernicharo and co-workers in 2021,
subsequent analysis of the ongoing
line survey in 2023 by
Loru and co-workers confirmed the detection.
Part of the effort of the follow-up study by Loru et al. involved experiments that generated
and then determined its rotational constants and other parameters. A search for 1,2-diethynylbenzene in the TMC-1
was unsuccessful. Various neutral-neutral reactions can yield ethynylbenzene: the most dominant one may be
C6H6 + CCH → C6H5CCH + H.