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  • 1
    Electronic Resource
    Electronic Resource
    The effect of food on the movement of pellets in the gastro-intestinal tract (1989)
    Springer
    Pharmacy world & science 11 (1989), S. 44-49 
    Details
    ISSN: 1573-739X
    Keywords: Barium sulfate ; Biopharmaceutics ; Dissolution ; Food ; Lithium sulfate ; Pellets controlled release ; Radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of food on the movement of pellets in the gastro-intestinal tract was investigated in seven volunteers, either by means of X-rays taken after oral administration of barium sulfate pellets or by means of saliva concentration profiles of lithium obtained after oral administration of lithium sulfate controlled-release pellets. The X-ray studies showed that food had an effect on the time required for the pellets to leave the stomach and on their degree of dispersion in the small intestine, but not on other parameters. The studies with the lithium sulfate controlled-release pellets showed that food had a significant effect only in one in three subjects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01962974
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Total Synthesis of Indole and Dihydroindole Alkaloids. IXFor a preliminary report on a portion of this work, see [1].Part VIII, see [2]. Studies on the synthesis of bisindole alkaloids in the vinblastine- vincristine series. The biogenetic approach (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 2858-2882 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A detailed study of the reaction of catharanthine N-oxide and vindoline has been carried out employing various conditions. Under optimum conditions, which involve low temperatures and trifluoroacetic anhydride as reagent, 3′, 4′-dehydrovinblastine (XIII, R = COOCH3), in reasonable yields is essentially the exclusive product. However two additional products, 18′ (epi)- 3′, 4′-dehydrovinblastine (XIV, R = COOCH3) and 1′-hydroxy- 3′, 4′-dehydrovinblastine (XVI, R = COOCH3) are also often isolated.The reaction, which follows the course of a Polonovski-type fragmentation process, has been extended to the N-oxide derivatives of dihydrocatharanthine and decarbomethoxycatharanthine to provide again a series of bisindole alkaloid derivatives, also vinblastines. A mechanistic rationale is provided to explain the various results obtained.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590824
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Die Darstellung höherer Alkylrhodanide. (Nachtrag) (1940)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 156 (1940), S. 260-260 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19401560902
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  • 4
    Electronic Resource
    Electronic Resource
    Präparative und spektroskopische Untersuchungen an SilylperoxydenHerrn Professor Dr. W. Langenbeck zum 60. Geburtstage gewidmet (1959)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 8 (1959), S. 241-255 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden spektroskopische Untersuchungen zur Strukturaufklärung von Siliciumperoxyden durchgeführt, einer neuen Verbindungsklasse, deren Erforschung im Rahmen der Entwicklung der peroxydischen Polymerisationskatalysatoren und Aktivatoren Bedeutung zukommt.Dabei wurden die IR- und Raman-Spektren der folgenden Präparate aufgenommen und untersucht: \documentclass{article}\pagestyle{empty}\begin{document}$$ \left({{\rm CH}_{\rm 3} } \right)_3 {\rm SiOOSi}\left({{\rm CH}_{\rm 3} } \right)_3,\left({{\rm CH}_{\rm 3} } \right)_3 {\rm SiOOC}\left({{\rm CH}_{\rm 3} } \right)_3,\left({{\rm CH}_{\rm 3} } \right)_3 {\rm COOC}\left({{\rm CH}_{\rm 3} } \right)_3,\left({{\rm C}_{\rm 2} {\rm H}_{\rm 5} } \right)_3 {\rm SiOOSi}\left({{\rm C}_{\rm 2} {\rm H}_{\rm 5} } \right)_3 $$\end{document} Es werden allgemeine Strukturbetrachtungen für Moleküle des Typs R3XOOXR3 als Viermassenmodell durchgeführt. Bei der Zuordnung der Spektren werden jeweils Vergleichssubstanzen herangezogen, die die Gruppierung R3X -  mit dem entsprechenden Peroxyd gemeinsam haben, um durch Aussonderung der Frequenzen des R3X-Gerüstes die Schwingungen der XOOX-Brücke isolieren zu können. Dabei kann als wahrscheinlichste Struktur für die Verbindungen des Typs R3SiOOSiR3 und R3COOCR3 ein wasserstoffperoxydähnlicher Bau der Moleküle abgeleitet werden. Diese Deutung wird durch die Tatsache gestützt, daß andere Bearbeiter mit Hilfe von Messungen elektrischer Momente zu ähnlichen Aussagen über den Molekülbau des Di-tert.-Butylperoxyds gelangen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19590080501
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    Paper (German National Licenses)
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