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  • 1
    Electronic Resource
    Electronic Resource
    ESR-spektroskopische Untersuchungen an Thioamiden, VI. Radikalanionen der N,N-Dialkylbenzamide, -thiobenzamide und -selenobenzamide (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1931-1944 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: ESR Studies in the Thioamide Series, VI.  -  Radical Anions of N,N-Dialkylbenzamides, -thiobenzamides, and -selenobenzamidesRadical anions of the title compounds 1-9 were generated by in-situ electroreduction and studied by ESR spectroscopy. Earlier assignments and interpretations of hfs splittings are partly revised. The radical anions of benzamides exhibit nonequivalency of the respective ortho and meta position in contrast to the higher homologues. - It is shown, that CSNR2 and CSeNR2 groups withdraw a great deal of spin density from the aromatic ring and are thus comparable with the nitro group.
    Notes: Durch in-situ-Elektroreduktion erzeugte Radikalanionen von Benzamiden 1-3, Thiobenzamiden 4-6 und Selenobenzamiden 7-9 werden ESR-spektroskopisch untersucht (Abbildungen 1 - 4). Dabei werden frühere Zuordnungen und Interpretationen von Hyperfeinstruktur-Aufspaltungen teilweise revidiert. Bei den Benzamid-Radikalanionen besteht bei Raumtemperatur Nichtäquivalenz der jeweiligen ortho- und meta-Positionen, bei den höheren Homologen dagegen nicht.  -  Es wird gezeigt, daß die CSNR2- und CSeNR2-Gruppen als Substituenten in aromatischen Radikalanionen dem Benzolring viel Spindichte entziehen und in dieser Hinsicht der Nitrogruppe ähneln.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919791202
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  • 2
    Electronic Resource
    Electronic Resource
    Reaktionen eines Thieno[3,4-c]isothiazols mit 1,2,4-Triazolin-3,5-dionen und Alkinen (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1796-1803 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of a Thieno[3,4-c]isothiazole with 1,2,4-Triazoline-3,5-diones and AlkynesThe reactions of the title compound 1 with the 1,2,4-triazoline-3,5-diones 4a, b as well as with dibenzoylethyne and bis(diethylamino)ethyne lead to the formation of the heterocycles 5, 7, and 12.
    Notes: Die Reaktionen der Titelverbindung 1 mit den 1,2,4-Triazolin-3,5-dionen 4a, b sowie mit Dibenzoylethin und Bis(diethylamino)ethin führen zu den Heterocyclen 5, 7 und 12.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619861013
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  • 3
    Electronic Resource
    Electronic Resource
    Understanding the mechanism of the zinc-ion stains of biomacromolecules in electrophoresis gels: Generalization of the reverse-staining technique (1998)
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 2398-2406 
    Details
    ISSN: 0173-0835
    Keywords: Detection ; Imidazole ; Negative staining ; Lysozyme ; Inflammation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: We have recently shown that a few nanograms of protein separated by electrophoresis in sodium dodecyl sulfate-polyacrylamide gels can be detected by reverse-staining, exploiting the precipitation reaction between zinc(II) and imidazole. Modifications of this method have also been generated to detect gelisolated nucleic acids and bacterial glycolipids. Because there is no recourse to chemical modifiers, the reverse-staining technique has been valuable when micropreparing these biomacromolecules for later use or characterization. The mechanism underlying the reverse-staining effect, however, remains incompletely understood and this has prevented a further generalization of the technique. Here, we have conducted physicochemical experiments and identified zinc imidazolate (ZnIm2) as the main component of the precipitate that forms along the surface of zinc-imidazole reverse-stained gels. Many staining effects observed when gels containing electrophoretically separated biopolymers are subjected to zinc-imidazole stains have been rationalized. The reverse-staining method has been vastly generalized, now allowing the detection of proteins and glycolipids as well as complexes of these macromolecules in native gels. We demonstrate the application of the reverse-staining technique in situations where Coomassie blue or silver staining was inappropriate or failed to produce detection of the species of interest. The present generalization of the reverse-staining method facilitated the characterization of biomacromolecular interaction partners in mixtures of bacterial glycolipids and human tears.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150191407
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