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  • 1990-1994
  • 1970-1974  (4)
  • 1970  (4)
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  • 1990-1994
  • 1970-1974  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 10 (1970), S. 229-250 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Das im Titel genannte Problem für ein dem Oseenschen ähnliches Modell, bei dem die Konvektionsströmung als reibungsfreie Scherströmung vorgegeben ist, wird für eine Kanalströmung mittels derWiener-Hopf-Methode exakt gelöst. Für den Fall, daß keine Rückströmung auftritt, ergibt die Grenzschichttheorie zweiter Ordnung das Resultat für den Wärmeübergang nahe der Plattenvorderkante als entsprechenden Grenzwert. Im Grenzfall einer reibungsfreien Flüssigkeit ist das Modell exakt, so daß Teil I direkt aufflüssige Metalle, derenPrandtlsche Zahl sehr klein ist, angewendet werden kann. Der Hauptzweck allerdings ist, den Boden für den mathematisch schwierigeren Teil II, der Reibungseffekte in vereinfachter Form behandelt, vorzubereiten.
    Notes: Summary The title problem for an Oseen-like model, with convection at the undisturbed shear velocity and viscous dissipation neglected, is solved exactly by theWiener-Hopf technique when the flow is limited to a channel. The result for heat transfer near the leading edge of the plate, when there is no reverse flow, is recovered (in its limiting form) by second-order boundary-layer theory. The model is exact in the inviscid limit, so that Part I is directly applicable to liquid metals (whosePrandtl numbers are very small). But its main purpose is to resolve mathematical difficulties of Part II, which is concerned with viscous effects, in a simpler context.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1704-1708 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Am Beispiel der Synthese von O,O-Diacetyl-L-cyclodopa-methylester (12) wird eine allgemein anwendbare Methode zur selektiven Acylierung der phenolischen Hydroxylgruppen oder des Indolin-Stickstoffs am Cyclodopa (8) beschrieben. Die Verwendung von L-DOPA (5) als Ausgangsmaterial für die Cyclisierung erlaubt die Darstellung grösserer Mengen solcher Derivate.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 964-973 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a search for a new and efficient synthesis of the compound 7, the cyclization of 5 (obtained by a Michael-reaction from 3 and 4) was studied. Treatment of 5 with strong acid furnished the known dienedione 8. Mild acidic conditions gave the bridged alcohol 9 and other, unidentified products, rather than the desired enone 6. Under basic conditions, 5 did not cyclize to 6, but underwent retro-Michael reaction. Attempts were then made to convert the dienedione 8 to the 14α-enone 19. However, both catalytic hydrogenation and lithium-ammonia reduction of 8 yielded mainly 14β-products. In some hydrogenation experiments, isomerization of the dienedione 8 to the phenols 13 (major) and 14 (minor) occurred. The stereochemistry of the new isomeric des-A-androst-9-en-5, 17-diones (16, 17 and 20) was determined by chemical and spectroscopic methods.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den N-Acyl-3-(3,4-dihydroxyphenyl)-L-alaninen 1a, 1b und 1c entstehen bei der Oxydation unter anderm die L-3-Acylamino-6,7-dihydroxy-hydrocumarine 2a, 2b und 2c. Diese Reaktion stellt einen präparativ brauchbaren Weg zur Synthese von 3-(2,4,5-Tri-hydroxyphenyl)-L-alanin (6-Hydroxy-L-DOPA, 3) aus 3-(3,4-Dihydroxyphenyl)-L-alanin dar.
    Type of Medium: Electronic Resource
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