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Two reduction waves of oximes and imine formation in acidic media

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F06%3A00085403" target="_blank" >RIV/61388955:_____/06:00085403 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Two reduction waves of oximes and imine formation in acidic media

  • Original language description

    The separation of the two two-electron waves in acidic media in solutions of some aromatic aldoximes and ketoximes is attributed to differences between the pK(a)-values of oximes (which are smaller than about 1.0) and those of protonated forms of corresponding in-tines. Dependences of halfwave potentials on pH show that the lower limit pK(a) of imine varies from -0.25 for p-formylbenzaldehyde oxime to 2.2 for p-fluorobenzaldehyde oxime. For the benzaldehyde and acetophenone oximes bearing substituents,which have pKa higher than -1.50, a good agreement was observed for pK(a)-values obtained spectrophotometrically and pK(ox) values obtained from the change in the slope of E-1/2(1) = f(H-0) plots. Past misrepresentations of the electroreduction mechanismof protonated forms of imines is attributed to insufficiently controlled compositions of supporting electrolytes.

  • Czech name

    Dvě redukční vlny oximů a tvorba iminů v kyselém prostředí

  • Czech description

    Separace dvou 2-elektronových redukčních vln aromatických aldoximů a ketoximů v kyselém prostředí je způsobena rozdílem mezi pKa výchozích oximů a pKa protonované formy příslušného iminového meziproduktu. Na základě elektrochemických dat bylo zjištěno, že hodnoty pKa studovaných iminů jsou mezi -1,5 až 2,2 a tyto výsledky byly potvrzeny spektrofotometricky. Byl diskutován vliv koncentrace halogenidů v základním elektrolytu.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CG - Electrochemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/1P05ME785" target="_blank" >1P05ME785: Chemical and electrochemical properties of oximes - antidotes against nervous gases</a><br>

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2006

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Electrochimica acta

  • ISSN

    0013-4686

  • e-ISSN

  • Volume of the periodical

    51

  • Issue of the periodical within the volume

    26

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    8

  • Pages from-to

    5845-5852

  • UT code for WoS article

  • EID of the result in the Scopus database