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We present the discovery in TMC-1 of vinyl acetylene, CH2CHCCH, and thedetection, for the first time in a cold dark cloud, of HCCN, HC4N, andCH3CH2CN. A tentative detection of CH3CH2CCH is also reported. The columndensity of vinyl acetylene is (1.2 +/- 0.2)e13 cm-2, which makes it one of themost abundant closed-shell hydrocarbons detected in TMC-1. Its abundance isonly three times lower than that of propylene, CH3CHCH2. The column densitiesderived for HCCN and HC4N are (4.4 +/- 0.4)e11 cm-2 and (3.7 +/- 0.4)e11 cm-2,respectively. Hence, the HCCN/HC4N abundance ratio is 1.2 +/- 0.3. For ethylcyanide we derive a column density of (1.1 +/- 0.3)e11 cm-2. These results arecompared with a state-of-the-art chemical model of TMC-1, which is able toaccount for the observed abundances of these molecules through gas-phasechemical routes.

Discovery of CH2CHCCH and detection of HCCN, HC4N, CH3CH2CN, and, tentatively, CH3CH2CCH in TMC-1