title: A new interstellar polyatomic molecule:  detection of propynal in the cold cloud TMC-1.
abstract: We report the detection of the acetylene derivative propynal (HC triple bond CCHO) in the cold cloud TMC-1, with an abundance that is very close to that for the related species tricarbon monoxide (C3O).  Propadienone, an isomer of propynal with the formula H2C=C=C=O, was not detected and is hence less abundant than either C3O or HC2CHO.
authors.affiliation: Five College Radio Astronomy Observatory, University of Massachusetts, USA.
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
authors.forename: R D
authors.initials: RD
authors.lastname: Brown
authors.forename: D M
authors.initials: DM
authors.lastname: Cragg
authors.forename: P
authors.initials: P
authors.lastname: Friberg
authors.forename: P D
authors.initials: PD
authors.lastname: Godfrey
authors.forename: N
authors.initials: N
authors.lastname: Kaifu
authors.forename: H E
authors.initials: HE
authors.lastname: Matthews
authors.forename: M
authors.initials: M
authors.lastname: Ohishi
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.forename: H
authors.initials: H
authors.lastname: Takeo
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D055580:Astronomical Phenomena; D001256:Astronomy; D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D002248:Carbon Monoxide; D055598:Chemical Phenomena; D002621:Chemistry; D005118:Extraterrestrial Environment; D007536:Isomerism; D008956:Models, Chemical
chemical_list: D000447:Aldehydes; C018132:propiolaldehyde; D002244:Carbon; D002248:Carbon Monoxide