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  • 1970-1974  (7)
  • 1925-1929
  • Organic Chemistry  (4)
  • General Chemistry  (2)
  • Glucoserepression  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Zur Regulation der L-Serin-Dehydratase in der Rattenleber (1970)
    Springer
    Clinical and experimental medicine 152 (1970), S. 294-305 
    Details
    ISSN: 1591-9528
    Keywords: L-Serine-Dehydratase ; Starvation ; Tryptophane ; Glycogen ; Glucose repression ; L-Serin-Dehydratase ; Nahrungsentzug ; Tryptophan ; Glykogen ; Glucoserepression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Regulation der L-Serin-Dehydratase werden Versuche an Ratten beschrieben, die 5 Tage zuvor proteinfrei ernährt waren. Das Enzym ist zu induzieren durch Caseinhydrolysat, Nahrungsentzug und Tryptophan. Die Induktion wird gehemmt durch Glucose, Glycerin, Pyruvat und Actinomycin. Mit zunehmendem Alter verringert sich die Induzierbarkeit des Enzyms. Das Leberglykogen hat für die Regulation keine Bedeutung.
    Notes: Summary The regulation of hepatic L-serine-dehydratase is described in rats after 5 days proteinfree diet. The enzyme is induced by free amino acids, starvation and tryptophane. Repression occurs by administration of glucose, glycerol, lactate, pyruvate, and actinomycin. Induction is diminished by increasing age of the animals. Hepatic glycogen has no importance for the regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02044913
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Isolierung von 3,4,5,6-Tetramethyl-1,2-diphenyl-benzocyclobutadien (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 412-413 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19740861109
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Über den Einfluss nichtpolarer Lösungsmittel auf Lage und Intensität von Absorptionsbanden in den Elektronenspektren apolarer Molekeln: I. Modell (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 739-758 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Based on the assumption that the influence of the solvent on the wavelength and intensity of the absorption spectrum of non-polar molecules is due to Coulombic interaction of the electronic transition moments, three models are presented to calculate the wavelength and intensity changes using perturbation theory. In addition a computer program which allows to calculate solvent effects by simulation of the molecular solvent shell is developped. Using known data from solution spectra of polyenes, the experimental wavelength and intensity changes are compared with the calculated values.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560218
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese von Polyeninen aus Cyclooctatetraendibromid (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1339-1351 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Polyenynes from Cyclooctatetraene DibromideCyclooctatetraene dibromide 1 reacts with ethynylmagnesium bromides 2 to give the substituted (3E,5Z,7Z,9E)-3,5,7,9-dodecatetraene-1,11-diynes 3, which can be converted into the corresponding all-trans-isomers 4. Spectral evidence for the structurs 3 and 4 is given and their complete hydrogenation to the long chain saturated hydrocarbons 5 by a simple route is described. The mechanism of this new reaction is discussed.
    Notes: Cyclooctatetraendibromid (1) bildet mit Äthinylmagnesiumbromiden 2 die substituierten (3E,5Z,7Z,9E)-3,5,7,9-Dodecatetraen-1,11-diine 3, die in die all-trans-Isomeren 4 übergeführt werden können. Neben den physikalischen Strukturbeweisen für 3 und 4 wird ihre vollständige katalytische Hydrierung beschrieben, mit der die entsprechenden langkettigen, gesättigten Kohlenwasserstoffe 5 präparative einfach zugänglich werden. Der Mechanismus der aufgefundenen Reaktion wird diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730815
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese und Valenztautomerie von 7-Alkinyl-1,3,5-cyclooctatrien (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1352-1361 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Valence Tautomerism of 7-Alkynyl-1,3,5-cyclooctatrieneA valence tautomeric mixture of the open-chain, the monocyclic, and the two stereoisomeric bicyclic acetylene derivatives 4, 5, and 6 and 7 are obtained when alkynylmagnesium bromides 3 react with the valence tautomers of the equilibrium 1 ⇌ 2. Proof of structure for each of the valence tautomers is based on spectral data and catalytical hydrogenation to the corresponding saturated hydrocarbons 8, 9, 10 and 11. An independent synthesis of the hitherto unknown compounds 9 and 10 is described. Photochemical synthesis of the adduct 16 from 14 and 15 followed by reduction to 10, and examination of stereochemical models allows assignment of the cis-trans and cis-cis configuration to the isomers 10 and 11, respectively. The thermal behavior of the valence tautomers of the equilibrium 4 ⇌ 5 ⇌ (6 + 7) is examined.
    Notes: Die Valenztautomeren des Gleichgewichts 1 π 2 liefern mit den Alkinylmagnesiumbromiden 3 ein Valenztautomerengemisch der offenkettigen, der monocyclischen und der beiden stereo-isomeren, bicyclischen Acetylenderivate 4, 5 sowie 6 und 7. Die Strukturen der einzelnen Valenztautomeren werden sowohl spektroskopisch als auch durch katalytische Hydrierung zu den entsprechenden, gesättigten Kohlenwasserstoffen 8, 9, 10 und 11 bewiesen. Die bisher unbekannten Verbindungen 9 und 10 werden zusätzlich auf einem unabhängigen Weg synthetisiert. Die photochemische Synthese des Addukts 16 aus 14 und 15 sowie seine anschließende Reduktion zu 10 erlaubt zusammen mit Modellbetrachtungen die Zuordnung einer cis-trans-Konfiguration für 10 und zwangsläufig einer cis-cis-Konfiguration für 11. Das thermische Verhalten der Valenztautomeren des Gleichgewichts 4 ⇌ 5 ⇌ (6 + 7) wird untersucht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730816
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  • 6
    Electronic Resource
    Electronic Resource
    Valenzisomerisierungen am Tetramethylcyclobuten, IV (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1893-1909 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Valence Isomerizations of Tetramethylcyclobutene, IV1,2)trans-1,2,3,4-Tetramethyl-3,4-bis(phenylethynyl)cyclobutene (1) dimerizes on heating to form 5. The adducts, 7, 12, (13 + 14), and 25 are obtained in the presence of activated acetylenes, maleic anhydride, oxygen or sulfur. The structures of these adducts were deduced from spectroscopic data and have been proved in some cases by independent syntheses. The formation of the dimer 5 and that of the adducts can be explained by postulating the benzocyclobutadiene derivative 31 as intermediate.
    Notes: trans-1,2,3,4-Tetramethyl-3,4-bis(phenyläthinyl)cyclobuten (1) dimerisiert sich beim Erhitzen zu 5. In Gegenwart von aktivierten Acetylenen, Maleinsäureanhydrid, Sauerstoff oder Schwefel erhält man die Addukte 7, 12, (13 + 14) und 25. Die Strukturen dieser Addukte werden aus den Spektren abgeleitet und zum Teil durch unabhängige Synthesen bewiesen. Die Bildung des Dimeren 5 und die der Addukte wird mit einem aus 1 intermediär entstehenden Benzocyclobutadienderivat 31 erklärt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319731111
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  • 7
    Electronic Resource
    Electronic Resource
    Isolation of 3,4,5,6-Tetramethyl-1,2-diphenylbenzocyclobutadiene (1974)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 13 (1974), S. 405-406 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197404051
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    Paper (German National Licenses)
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