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  • Analytical Chemistry and Spectroscopy  (2)
  • 2-Hexenoic acid, 4,5-epoxy-  (1)
  • 1
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The application of Fourier-transform laser microprobe mass spectrometry to lichens is described. The in situ detection of a new perylene quinone in samples of the tropical species Laurera sanguinaria Malme and Graphis haematites Fée was achieved with minimal specimen preparation. The high mass resolution and mass accuracy of the instrument eliminates the need for additional characterization of the isolated substances by high resolution electron impact mass spectrometry and direct introduction probe.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 472-478 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of tridentoquinone and its derivatives are characteristically different from those of the biogenetically related boviquinones. The complex fragmentation pattern could be deduced to some extent using high resolution mass spectrometry, the metastable refocusing technique and in the case of secotridentoquinone, labelling of the hydroxyl functions.
    Notes: Die Massenspektren von Tridentochinon und seinen Derivaten sind charakteristisch verschieden von denen der biogentisch verwandten Bovichinone. Ein Teil des komplexen Fragmentierungsverhaltens konnte durch hochauflösende Massenspektrometrie, Verwendung der Defokussierungstechnik und im Fall des Secotridentochinons durch Untersuchung der [OD]- markierten Verbindung aufgeklärt werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0170-2041
    Keywords: Terphenyl derivatives ; Leucomentins ; 2-Hexenoic acid, 4,5-epoxy- ; Paxillus atrotomentosus ; Atromentin, precursor of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fungal Pigments, 60. - Leucomentins, Colourless Precursors of Atromentin from the Mushroom Paxillus atrotomentosusAtromentin (1) occurs in sporophores of Paxillus atrotomentosus mainly in form of the colourless leucomentins 3-5. These compounds constitute esters of leucoatromentin with (2Z,4S,5S)-4,5-epoxy-2-hexenoic acid. The absolute configuration of the latter has been determined by its conversion into (+)-O-acetylosmundalactone (6a). The mechanism of the acid-catalyzed cleavage of the acyl residues has been studied by means of 18O labeling.
    Notes: Atromentin (1) liegt in Fruchtkörpern des Samtfußkremplings hauptsächlich in Form der farblosen Leucomentine 3-5 vor. Die Leucomentine sind Ester des Leukoatromentins mit (2Z,4S,5S)-4,5-Epoxy-2-hexensäure, deren absolute Konfiguration durch Überführung in (+)-O-Acetylosmundalacton (6a) bestimmt werden konnte. Dabei wurde der Mechanismus der säurekatalysierten Abspaltung der Säurereste durch 18O-Markierung aufgeklärt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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