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  • Organic Chemistry  (8)
  • Wiley-Blackwell  (8)
  • American Heart Association (AHA)
  • Oxford University Press
  • Springer
  • 2010-2014
  • 1975-1979  (4)
  • 1970-1974  (4)
Document type
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  • Wiley-Blackwell  (8)
  • American Heart Association (AHA)
  • Oxford University Press
  • Springer
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Year
  • 1
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Metabolism of the Retinoid Ro 10-9359. Isolation and Identification of the Major Metabolites in Human Plasma, Urine and Feces Synthesis of Three Urinary MetabolitesAfter oral administration of therapeutic doses of the 3H-labelled aromatic retinoic acid analog (retinoid) Ro 10-9359 (ethyl all-trans-9-(4-methoxy-2,3,6-trimethyl-phenyl)-3,7-dimethyl-2,4,6,8-nonatetraenoate) to humans 75 and 15% of the 3H-dose were excreted within the first five days in the feces and the urine, respectively. Using chromatographic procedures including high pressure liquid chromatography 18 metabolites could be isolated from human urine. Their structures were elucidated by mass spectrometry and FT-1H-NMR. spectroscopy. In these urinary metabolites the tetraene side chain of the parent compound Ro 10-9359 is shortened. The radioactivity of the identified urinary metabolites accounted for about 11% of the dose. Three urinary metabolites were synthesized. The main part of the radioactivity excreted within the first five days in the feces consisted of unchanged drug (60% of the dose). A smaller (amount 15% of the dose) could not be identified. The unchanged drug and a major metabolite, the corresponding acid, were found in human plasma.In an experiment with bile-duct cannulated rats the radioactively labelled retinoid Ro 10-9359 was injected intravenously. About 70% of the 3H-dose was excreted in the bile, within the first 48 hours. The whole radioactivity of the rat bile consisted of polar metabolites. No unchanged drug could be found. After enzymatic hydrolysis of the bile conjugates three metabolites were isolated. The main metabolite (49% of the i.v. dose) was a conjugate of the corresponding acid of the parent drug, already found as free compound in human plasma. The other bile metabolites (9 and 7% of the i.v. dose) had an intact side chain, too.An enterohepatic recycling of the bile metabolites was observed in the rat.
    Additional Material: 4 Tab.
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  • 2
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several long chain primary alcohols (saturated, monoolefinic and methyl branched) have been converted via their mesylates into various long chain alkylated aromatic compounds with basic character, and their mass spectra compared. The spectra of 2-alkylaminopyridines and to some extent those of 3-alkylaminopyridines exhibit most clearly the structure of the aliphatic chain, allowing the localization of branchings and double bonds.
    Additional Material: 14 Ill.
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  • 3
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: One unsaturated and three branched long-chain primary alcohols have been converted into N-alkyl-2-pyrrolidones for investigation by mass spectrometry. The EI. mass spectra of these derivatives have been found to exhibit unambiguously the branching points and, albeit less clearly, the position of a double bond in the chain.
    Additional Material: 5 Ill.
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  • 4
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The base catalyzed rearrangement of 9,10,10-tricyano-5,9-methano-2,3,5,9-tetrahydro-cyclohepta[b]pyridines depends on the nature of the substituent at C(14). Seven products were isolated and identified. One structure resulting from a further ring closure was determined by x-ray analysis.
    Additional Material: 5 Ill.
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  • 5
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chromic acid oxidation of polyenes with terminal β-ionylidene groups has been studied. A number of hitherto unknown and unexpected oxidation products has been isolated. A mechanism for these oxidations is discussed.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 1599-1605 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrrolidide group is, in contrast to the carboxy- and ester groups, capable of inducing strong electron impact fragmentation at the b̃- and γ-bonds in complicated alicyclic and aliphatic compounds. The fragments so formed allow certain conclusions concerning the structure in the neighbourhood of the functional group.
    Additional Material: 10 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 474-478 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In den Jahren 1933-37 sind eine Reihe von Arbeiten über die Inhaltsstoffe von Maytenus Chuchuhuasha und über die pharmakologische Wirkung von Chuchuhuasha-Extrakten. publizier worden [1], deren Inhalt sehr eingehend in der Dissertation von Robert Colas zusammengefasst wurde [2].Die verschiedenen Maytenus-Sendungen (hauptsächlich Wurzeln und Stammrinde), die Colas erhielt, stammten aus dem oberen Amazonasgebiet: drei Muster aus Iquitos (Peru) und drei Sendungen aus Leticia (Columbien). Wässerige Extrakte dieser Pflanzen werden von den Eingeborenen jener Gegenden als Aphrodisiakum eingenommen.Die botanische Bestimmung des Pflanzenmaterials wurde damals von dem einen von uns (R. H.) vorgenommen. Anhand von makroskopischen und mikroskopischen Untersuchungen der Stammrinde, der Blätter und Blüten wurde festgestellt, dass es sich bei einer der Sendungen ein wandfrei um eine neue Maytenus-Spezies handelte, die als Maytenus Chuchuhuasha (Raymond Hamet et Colas) bezeichnet und die botanisch auch gegen Maytenus communis abgegrenzt wurde. Weniger sicher war die Bestimmung einer zweiten Maytenus-Spezies, die gelegentlich erhalten wurde. Sie wurde in der Dissertation Colas als «Maytenus non déterminé» bezeichnet und wurde chemisch nicht weiter bearbeitet. Gelegentlich enthielten Pflanzensendungen auch eine neue Salacia-Spezies (Hippocrataceae), die Salacia Colasi (R. Ben.) benannt wurde. Auch diese Salacia wurde chemisch nicht weiter untersucht.
    Additional Material: 1 Ill.
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  • 8
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Directed Synthesis of Catena Compounds, XI1). Bis-diansa Compounds of 5-Amino-benzodioxole as Models for the Synthesis of [3]-CatenanesMethods for the synthesis of [3]-catenanes according to the directed synthesis principle are discussed. In model investigations the α.ω-bis-[3,4-dihydroxy-phenyl]-alkanes 8a-c and 9c are ketalized with 1,21-dichloroheneicosan-11-one to give the ketals 10a-c and 11c. These compounds are nitrated to the dinitro derivatives 12a-c and 13c and reduced to the diamines 14a-c and 15c. The cyclization of these compounds using the high dilution method yields bis-diansa compounds of the types 16 and 17. In the case of diamines 14c and 15c, by-products could be isolated from the cyclization. Based on spectroscopic data and chemical reactions structures 18, 20 and 22 or 18, 21 and 23 (n = 12) are assigned to these compounds. It is discussed how the lengths of the chains connecting the two aromatic nuclei may influence the structure of the cyclization products.
    Notes: Verfahren zur Darstellung eines [3]-Catenans nach dem Prinzip einer gezielten Synthese werden angegeben und Modelluntersuchungen durchgeführt. Ausgehend von den α.-ω-Bis-[3.4-dihydroxy-phenyl]-alkanen 8a-c und 9c werden durch Ketalisierung mit 1.21-Dichlorheneicosanon-(11) die Ketale 10a-c und 11c hergestellt. Über die Dinitro-Derivate 12a-c und 13c werden die Diamine 14a-c und 15c erhalten. Die Cyclisierung dieser Verbindungen unter Verdünnungsbedingungen führt zu Bis-diansa-Verbindungen der Typen 16 und 17. Im Falle der Diamine 14c und 15c lassen sich Nebenprodukte isolieren, für welche aufgrund spektroskopischer Daten und chemischer Umsetzungen die Strukturen 18, 20 und 22 bzw. 18, 21 und 23 (n = 12) angegeben werden. Der Einfluß der Länge der die beiden aromatischen Ringe verbindenden Polymethylen-Kette auf die Struktur der Cyclisierungsprodukte wird diskutiert.
    Additional Material: 1 Ill.
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