Sökning: "tautomerism"

Hittade 3 avhandlingar innehållade ordet tautomerism.

  1. 1. Excitation and Ground-State Properties of Natural and Modified Nucleic Acid Bases

    Författare :Anders Holmén; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ab initio; linear dichroism; DFT; transition moment; tautomerism; structure; IR; spectra; DNA bases;

    Sammanfattning : The nucleic acid bases are the carriers of genetic information in DNA and RNA. They are also the main chromophores of nucleic acids and determine their optical properties and sensitivity to UV radiation. LÄS MER

  3. 2. Synthesis of indole and oxindole derivates incorporating pyrrolidino, pyrrolo or imidazolo moieties

    Författare :Stanley Rehn; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Isatin; three-component reaction; a-amino acid; azomethine ylide; pyrrolidino-3-spiro-3?-oxindole derivatives; 3-methyleneoxindole derivatives; pyrroloquinolone; TosMIC; ß-carboline; tosylimine; pyrrole; keto-enol tautomerism; indolopyran-2-one; imidazole; benzylimine; tetrahydroindole;

    Sammanfattning : The focus of this thesis is on the synthesis of oxindole- and indole-derivatives incorporating pyrrolidins, pyrroles or imidazoles moieties. Pyrrolidino-2-spiro-3'-oxindole derivatives have been prepared in high yielding three-component reactions between isatin, alpha-amino acid derivatives, and suitable dipolarophiles. LÄS MER

  4. 3. Structure and Dynamics of Core-Excited Species

    Författare :Oksana Travnikova; Maria Novella Piancastelli; Svante Svensson; Denis Ceolin; Pascal Lablanqui; Uppsala universitet; []
    Nyckelord :Physics; Synchrotron radiation; X-ray Photoelectron Spectroscopy XPS ; X-ray Absorption Spectroscopy XAS ; Resonant Auger Spectroscopy RAS ; Auger Electron Spectroscopy AES ; Energy-Selected Auger Electron PhotoIon COincidence ES-AEPICO ; core excitation; core ionization; linear free energy relationships LFER ; molecular-field splitting; substituent effects; nuclear dynamics; isomerization; Cl2; N2O; methane derivatives; allene; acetylacetone; Fysik;

    Sammanfattning : In this thesis we have performed core-electron spectroscopy studies of gas phase molecular systems starting with smaller diatomic, continuing with triatomic and extending our research to more complex polyatomic ones. We can subdivide the results presented here into two categories: the first one focusing on electronic fine structure and effect of the chemical bonds on molecular core-levels and the other one dealing with nuclear dynamics induced by creation of a core hole. LÄS MER