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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 61 (1987), S. 161-163 
    ISSN: 1432-0738
    Keywords: Furazolidone ; Nitrofurans ; Metabolism ; Ethylene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The investigation was aimed at providing insight into the side chain metabolism of furazolidone in mice. The agents used in the experiments were furazolidone, 3-amino-2-oxazolidinone, oxazolidinone, nitrofurantoin, 3-aminohydantoin and hydantoin, administered intraperitoneally at five equimolar doses ranging from 0.178 to 0.888 mmol/kg. The parameters investigated included ethane and ethylene expiration, formation of malondialdehyde and total glutathione content in the liver. Ethylene expiration was found to be strongly enhanced by aminooxazolidinone and slightly increased by furazolidone. Ethane expiration was increased after aminooxazolidinone administration. Malondialdehyde formation was not affected by any of the agents used. Total glutathione was decreased by furazolidone and nitrofurantoin. The above findings indicate that, in vivo, the azomethine linkage of the side chain of furazolidone hydrolyses to form 3-amino-2-oxazolidinone, subsequently cleaved to ethylene.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 292 (1978), S. 233-235 
    ISSN: 1618-2650
    Keywords: Spektralphotometrie ; Ableitungen höherer Ordnung, Analogdifferenzierer, Derivativverfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über eine neu entwickelte Analog-Recheneinheit berichtet, mit der man Ableitungen von Spektren und anderen Meßsignalen erstmalig bis zur 7. Ordnung on-line verwirklichen kann. Wie die Prüfungen ergaben, ist die optimale Auflösung in den meisten Fällen mit der 4. Ableitung erreicht. Dann sind nämlich alle Schultern und Wendepunkte der Kurven in bipolare Signale übergeführt. Eine Aufstellung der wichtigsten bisherigen Anwendungsgebiete wird gegeben.
    Notes: Summary This report deals with a newly developed analogue computing accessory by which derivations of spectra and other electric signals up to the seventh order were realized on-line. A thorough study of this apparatus showed that in most cases fine-resolving is reached by the fourth derivation. In this case, all shoulders and points of inflections are resolved to bipolar signals. A number of examples for applying derivative spectrophotometry of higher order (DSHO-method) is also given.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 970-978 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Introduction of the (Dimethylhydrazono)ethyl Group into Methylene Active Compounds and PhenolsIn [2-(dimethylhydrazono)ethyl]trimethylammonium iodide the trimethylammonium group can be substituted by several nucleophiles. With this reagent (dimethylhydrazono)ethyl derivatives of CH-acidic compounds, phenols, and indole can be prepared.
    Notes: In [2-(Dimethylhydrazono)ethyl]trimethylammonium-iodid (19) läßt sich die Trimethylammoniumgruppe durch verschiedenartige Nucleophile verdrängen. CH-acide Verbindungen sowie Phenole und Indole kann man mit diesem Reagenz zu den entsprechenden Hydrazonoethyl-Derivaten umsetzen.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3863-3877 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Monohydrazones of Dicarbonyl Compounds, X: 2-(Dimethylhydrazono)propanal as a Reagent for the Synthesis of 1,4-DiketonesMonohydrazones 7 of unsaturated 1,4-diketones can be prepared by the reaction of methyleneactive ketones 1a-x with 2-(dimethylhydrazono)propanal (5a). From these products unsaturated 8 and saturated 1,4-diketones (9) are obtained in high yield. Reduction of the diketone monodimethylhydrazones 7g, h, i, p, q with sodium borohydride and subsequent hydrolysis leads to the formation of furans 23and/or N-aminopyrroles 24. The synthesis of a Δ1-pyrrolin 30, which was isolated from the poison gland of the South African thief ant Solenopsis punctaticeps is described7.
    Notes: 2-(Dimethylhydrazono)propanal (5a) läßt sich mit CH-aciden Verbindungen 1a-x, die eine α-ständige Methylengruppe enthalten, zu Hydrazonopropyliden-Derivaten 7a-x umsetzen. Durch Hydrolyse erhält man ungesättigte, 1,4-Diketone 8 und durch deren Reduktion gesättigte 1,4-Diketone 9. Die Monohydrazone 7g, h, i, p, q ergeben nach Borhydrid-Reduktion und Hydrolyse Furane 23 und / oder N-Aminopyrrole 24. Katalytische Hydrierung des Diketon-monodimethyl hydrazons 29 liefert das Δ1-pyrrolin 30, ein Abwehrstoff der aus der Giftdrüse der südafrikanischen Feuerameise Solenopsis punctaticeps isoliert wurde7.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 563-564 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 840-854 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In den vergangenen zwei Jahren hat die Derivativspektrophotometrie zunehmend an Bedeutung gewonnen und erlebt gegenwärtig einen stürmischen Aufschwung. Dieser Aufsatz bringt nach einer Einführung eine Übersicht über die äußerst leistungsfähige Methode. An praktischen Beispielen aus den verschiedensten Gebieten der Analytik wird vor allem auf die Vorteile der Derivativspektrophotometrie höherer Ordnung (DSHO-Methode; n〉2) eingegangen. Die Ergebnisse wurden mit einer neu entwickelten Analogrecheneinheit erzielt, mit der man erstmalig gut reproduzierbare rauscharme Spektren on-line bis zur 7. Ordnung, in günstigen Fällen sogar bis zur 9. Ordnung verwirklichen kann. In der Praxis hat sich das Arbeiten mit Spektren der 3. bis 5. Ordnung bewährt; noch höhere Ableitungen können bei der Trennung stark überlagerter Signale oder bei „Fingerprints“ vorteilhaft sein.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 15 (1976), S. 554-555 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 17 (1978), S. 532-533 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 17 (1978), S. 785-799 
    ISSN: 0570-0833
    Keywords: UV/Vis spectroscopy ; Spectrophotometry ; Analytical methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Derivative spectrophotometry has gained increasing importance in the past two years and is currently experiencing vigorous development. Following and introduction the present article provides a review of this extremely effective method. In particular, the advantages of higher-order derivative spectrophotometry (HODS method, n 〉 2) are discussed on the basis of practical examples from a wide range of analytical fields. The results are achieved with the aid of a newly developed analog computer unit, whereby for the first time readily reproducible, low-noise, on-line spectra can be obtained up to the 7th order and even, in favorable cases, up to the 9th order. In practice it has proved valuable to work with spectra of the 3rd to 5th order; but even higher derivations could be profitable for the separation of strongly superposed signals or for “fingerprinting”.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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