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  • 1955-1959  (5)
  • Chemistry  (5)
  • FAD (flavin-adenine dinucleotide)
  • Flavosemiquinone
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Studien in der Lumiflavin-Reihe V. Spezifische Reaktivität 8-ständiger Substituenten am Isoalloxazin-Kern Flavin-Dimere (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 2164-2177 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 8-methyl group of riboflavin and lumiflavin is shown to be activated, in agreement with B. & A. Pullman's LCAO-MO-model. Chemical evidence for this is given by reactions of 8-chloro-7,10-dimethyl-flavin with nucleophilic agents, of 8-methylflavins with NO and CO groups, and by the base-catalysed dimerisation of 8-methylflavins giving rise to a new class of flavin-like pigments. The particular redox-behaviour of these “biflavins” is described and their possible biochemical importance is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420645
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesen in der Lumiflavinreihe II (1957)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 40 (1957), S. 180-186 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Starting from lumiflavine and its 2-thio-analogue, the leukoflavine nucleus was obtained and stabilized by reductive acylation. The acyl-leuko-compounds seem to exhibit the possibility of substitution reactions in 2- and 4-positions. Several new lumiflavines were obtained, e. g. 4-thiolumiflavine and 2-desoxylumiflavine. The latter shows rather peculiar oxido-reductive properties which are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19570400120
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen in der Lumiflavinreihe IVIII: P. HEMMERICH, Helv. 41, 514 (1958). (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1604-1611 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,4-Substituted flavins (isoalloxazines) bearing an NH2-group in 8-position were found to be stable and easily accessible. In particular the 2- and 4-imino-, resp. 2,4-diimino-compounds are similar to riboflavin in colour and fluorescence, but readily water-soluble. The chemical behaviour of this new class of flavins is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420522
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Pyridyl-1,3,4-thiadiazole; eine neue Variante der Thiadiazol-Synthese (1958)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 41 (1958), S. 2058-2065 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thiosemicarbazones of aromatic aldehydes react with acetic anhydride to give well-defined N4,S-diacetyl derivatives, which readily undergo oxidative cyclisation to 2-aryl-4-acetamido-1,3,4-thiadiazoles. From these intermediates, aryl-thiadiazoles - especially 2-(2′-pyridyl)-1,3,4-thiadiazole, inaccessible by the common methods - can be obtained by acidic deacetylation, SANDMEYER substitution and catalytic dehalogenation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19580410714
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesen in der Lumiflavinreihe (1956)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 1242-1252 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A short way for the synthesis of lumiflavin and derivatives is developed, leading to the new structural analogues 2-thiolumiflavine and 2-lumiflavimine, which exhibit interesting oxido-reductive and metal chelating properties and may be riboflavin antirnetabolites.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19560390511
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    Paper (German National Licenses)
    Fulltext
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