The 1,3-pentadiyne molecule CH3C4H, aka methyldiacetylene, had been identified in spectra recorded toward TMC-1 by two groups independently and at almost the same time
J. M. MacLeod, L. W. Avery, N. W. Broten,
The detection of interstellar methyldiacetylene (CH<sub>3</sub>C<sub>4</sub>H)
Astrophys. J. 282, L89–L92 (1984);
C. M. Walmsley, P. R. Jewell, L. E. Snyder, and G. Winnewisser,
Detection of interstellar methyldiacetylene (CH<sub>3</sub>C<sub>4</sub>H) in the dark dust cloud TMC 1
Astron. Astrophys. 184, L11–L14 (1984).

The molecule was also detected by
M. Araki, S. Takano, N. Sakai, S. Yamamoto, T. Oyama, N. Kuze, and K. Tsukiyama,
who studied
Long Carbon Chains in the Warm Carbon-chain-chemistry Source L1527: First Detection of C<sub>7</sub>H in Molecular Clouds,
Astrophys. J. 847 Art. No. 51 (2017).
The three J = 11 – 10 transitions with K = 0, 1, and 2 were detected near 44.8 GHz with the 100 m GBT.

C. Cabezas, R. Fuentetaja, E. Roueff, M. Agúndez, B. Tercero, N. Marcelino, J. R. Pardo, P. de Vicente and J. Cernicharo
reported on
New Deuterated Species in TMC-1: Detection of CH<sub>2</sub>DC<sub>4</sub>H with the QUIJOTE line survey,
Astron. Astrophys. 657 Art. No. L5 (2022).
Twelve transition with J = 8 to 12 and Ka ≤ 1 were detected with the Yebes 40 m radio telescope. The CH3C4H to CH2DC4H abundance ratio of 24 ± 2 is very similar to that of CH3C3N to CH2DC3N ratio of 22 ± 2.

Contributor(s): H. S. P. Müller; 7, 2004; 10, 2017; 03, 2022

  • molecules/ism/ch3c4h.txt
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