摘要：We report the discovery of five cyano derivatives of propene towards TMC-1 with the QUIJOTE line survey: trans and cis-crotononitrile (t-CH3CHCHCN, c-CH3CHCHCN), methacrylonitrile (CH2C(CH3)CN), and gauche and cis-allyl cyanide (gCH2CHCH2CN and c-CH2CHCH2CN). The observed transitions allowed us to derive a common rotational temperature of 7±1 K for all them. The derived column densities are N(t-CH3CHCHCN) = (5±0.5)×1010 cm−2 , N(c-CH3CHCHCN) = (1.3 ± 0.2) × 1011 cm−2 , N(CH2C(CH3)CN) = (1.0±0.1) × 1011 cm−2 , N(g-CH2CHCH2CN) = (8.0 ± 0.8) × 1010 cm−2 , and N(c-CH2CHCH2CN) = (7.0 ± 0.7) × 1010 cm−2 , respectively. The abundance of cyano-propene relative to that of propene is thus ∼10−2 , which is considerably lower than those of other cyano derivatives of abundant hydrocarbons. Upper limits are obtained for two ethynyl derivatives of propene (E and Z-CH3CHCHCCH).
