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  • 1
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Occurence of Hydrogen Transfer, 191). Specific Reductive Cleavage of Some Acyl Groups from Nitrogen at the Mercury CathodeElectron donators in the aromatic acyl group and in the amine component shift the reduction potentials of sulfonamides and of carbonamides to more negative values, and hinder the cathodic cleavage. Electron acceptors have the opposite effect. Aromatic ligands on the nitrogen atom change the reduction potentials to more positive values. The influence of the substituents on the reduction potentials follows the Hammett relationship. - If a potential difference of at least 0.2 V exists between acyl groups (which may be in the same molecule, or in different molecules), then selective cleavage of the acyl group having the more positive potentials is possible.
    Notes: In Sulfon und Carbonamiden mit aromatischem Acyl-Rest werden die Reduktionspotentiale durch Elektronen-Donatoren im Acyl-Rest und in der Amin-Komponente zu negativeren Werten verschoben; dabei wird die kathodische Spaltung erschwert. Elektronen-Acceptoren wirken umgekehrt. Aromatische Liganden am Stickstoff verlagern das Reduktionspotential zu positiveren Werten. Die Abhängigkeit der Reduktionspotentiale vom Substituenten gehorcht der Hammett-Beziehung. - Besteht zwischen den Acylamino-Gruppen, die im gleichen Molekül oder auch in verschiedenen Molekülen gebunden sein können, ein Potentialunterschied von wenigstens 0.2 V, so ist eine selektive Abspaltung der Acyl-Gruppe mit dem positiveren Potential möglich.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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