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  • Capillary electrophoresis  (1)
  • Computational Chemistry and Molecular Modeling  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Photoelectron spectra and gas phase tautomerism of some pyrazolones (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 26 (1984), S. 237-248 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The HeI photoelectron (PE) spectra of six 4-substitued 3-methyl-1-phenylpyrazolin-5-ones and the unsubstituted parent compound were measured. The interpretation of the low-energy region of these spectra is attempted on the basis of HAM/3 molecular orbital calculations, making allowance for different tautomeric forms of the compounds. The results indicate preference of the CH versus the NH and/ or OH tautomer of these compounds in the gas phase at the temperatures employed (100-150°C).
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560260725
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  • 2
    Electronic Resource
    Electronic Resource
    Separation of synthesized enantiomers and diastereomers of thiino-[4,3-b]pyrrole-2,3-dione derivatives and 2H-thiopyrans by capillary electrophoresis (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 978-984 
    Details
    ISSN: 0173-0835
    Keywords: Capillary electrophoresis ; Cyclodextrins ; Resolution ; Substituents ; Degradation products ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Capillary electrophoresis was used to separate diastereomers and enantiomers of synthesized thiopyrans and thiinopyrroles. Separation conditions were optimized by varying the buffer parameters, i.e., kind and concentration of chiral selector, pH, main buffering component, micelle forming additives, and content of organic solvents. The interaction of thiopyrans and thiinopyrroles with β- and γ-cyclodextrins results in the separation of enantiomers and diastereomers. The magnitude of the resolution depends on the spatial requirements of the different substituents of the analytes and the dimensions of the cyclodextrin cavity. For well-separated enantiomers or diastereomers the identification and characterization of degradation products was possible.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150180620
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