title: Acetylenic thiophenes from the roots of Escinops ellenbeckii from Ethiopia.
abstract: The hexane fraction from the roots of Echinops ellenbeckii O. Hoffm. from Ethiopia yielded seven acetylenic thiophenes of which five compounds (1, 3, 4, 6, 7) are reported for the first time in this species: the monothiophenes 5-(penta-1,3-diynyl)-2-(but-3-en-1-ynyl)-thiophene (1), 5-(penta-1,3-diynyl)-2-(4-acetoxy-but-1-ynyl)-thiophene (2), 5-(penta-1,3-diynyl)-2-(3-hydroxy-4-acetoxy-but-1-ynyl)-thiophene (3), 5-(penta-1,3-diynyl)-2-(3,4-diacetoxy-but-1-ynyl)-thiophene (4), 5-(penta-1,3-diynyl)-2-(3-chloro-4-acetoxy-but-1-ynyl)-thiophene (5), 5-(penta-1,3-diynyl)-2-(3,4-epoxy-but-1-ynyl)-thiophene (6) and the dithiophene 5-[(5-acetoxymethyl-2-thienyl)-2-(but-3-en-1-ynyl)]-thiophene (7). Additionally, four fatty acids (C14, C15, C16 and C18), seven fatty acid esters and three long-chain hydrocarbons could be identified. All the structures were elucidated on the basis of spectral data by GC-MS, HRMS and the NMR techniques.
authors.affiliation: The Plant Biocentre, Department of Biology, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway.
authors.forename: Ariaya
authors.initials: A
authors.lastname: Hymete
authors.forename: Jens
authors.initials: J
authors.lastname: Rohloff
authors.forename: Helge
authors.initials: H
authors.lastname: Kjøsen
authors.forename: Tor-Henning
authors.initials: TH
authors.lastname: Iversen
mesh_terms: D019659:Asteraceae / Q000737:chemistry* / Q000166:cytology / Q000502:physiology; D002849:Chromatography, Gas; D005002:Ethiopia; D005227:Fatty Acids / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D018517:Plant Roots / Q000737:chemistry* / Q000166:cytology; D013876:Thiophenes / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D013876:Thiophenes