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  • Articles: DFG German National Licenses  (3)
  • 1980-1984  (3)
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  • Articles: DFG German National Licenses  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1024-1035 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Red Membrane Pigments of the Peat Moss Sphagunum rubellumThe red colour of the peat moss Sphagnum rubellum results from three membrane pigments, the sphagnorubins A, B, and C; they have been isolated and their structures elucidated. Sphagnorubin A (1) is identical with the formerly known sphagnorubin obtained from Sphagnum magellanicum. Sphagnorubin B (3) was identificated as 2-(3′,4′-dihydroxyphenyl)-8,9-dihydroxy-11-methoxyphenanthro[2,1-b]pyrylium chloride. Sphagnorubin C (7) is the 3′-methyl ether of sphagnorubin B.
    Notes: Die rote Pigmentierung des Torfmooses Sphagnum rubellum wird durch drei Membranochrome, die Sphagnorubine A, B und C, hervorgerufen; sie wurden isoliert und ihre Strukturen aufgeklärt. Das Sphagnorubin A (1) ist identisch mit dem aus Sphagnum magellanicum bekannten Sphagnorubin. Das Sphagnorubin B (3) wurde als 2-(3′,4′-Dihydroxyphenyl)-8,9-dihydroxy-11-methoxyphenanthro[2,1-b]pyryliumchlorid identifiziert. Das Sphagnorubin C (7) ist der 3′-Methylether des Sphagnorubin B.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 401-406 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A New Method for the Degradation of Anthocyanidins, Flavones, Chalcones, and CoumarinsAfter transformation into the corresponding chalcone or flavenol acetates anthocyanidins are oxidatively cleaved with ruthenium tetroxide to yield benzoic acid derivatives of the rings A and B. Flavones, chalcones, and coumarins are degradated by the same method.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1984), S. 330-333 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Acetoxychalcones decompose under electron impact conditions by loss of an acetoxy fragment to form flavylium ions. The effect is restricted to the ortho position and is reduced after hydrogenation of the chalcone double bond. The intense flavylium ion originates - as shown by specific labelling with 18O - from two different fragmentation lines: (a) direct loss of an acetoxy radical by cleavage of the phenolic Ar—O bond and (b) sequential elimination of ketene and a hydroxy radical.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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