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  • Retention index data  (1)
  • Ring opening  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Structure-retention correlations of hydrocarbons in GLC and GSC alkenylbenzenes (1987)
    Springer
    Chromatographia 23 (1987), S. 561-565 
    Details
    ISSN: 1612-1112
    Keywords: Gas-liquid chromatography ; Gas-solid chromatography ; Retention index data ; Alkenylbenzenes ; Graphitized thermal carbon black
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary For the study of relationships between retention behaviour and molecular structure in GLC and GSC the retention indices of alkenylbenzenes with 2–6 carbon atoms in a straight or branched side chain and of isotopological alkylbenzenes were determined on capillary columns coated with OV-1 and Ucon LB and on a micropacked column filled with graphitized thermal carbon black. From the values obtained index differences corresponding to the increments of the double bond in the side chain were derived. These differences depend significantly on the structure of the side chain and of the position of the double bond. In the case of 1-phenyl-1-alkenes the double bond close to the aromatic ring gives rise to an increase of retention values, especially for the trans-isomers, causing remarkable retention differences between the cis and transisomers. The alkenylbenzenes which exhibit a terminal double bond are less strongly retained than the isotopological alkylbenzenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324864
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  • 2
    Electronic Resource
    Electronic Resource
    Ring opening of cyclohexane over ZSM-zeolites followed by reversed-flow gas chromatography (1995)
    Springer
    Chromatographia 41 (1995), S. 227-235 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Reversed-flow technique ; Catalysis ; Ring opening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Kinetic parameters for the ring opening of cyclohexane over modified ZSM-5 zeolites can be measured simultaneously under non-steady state conditions using reversed-flow gas chromatography. At relatively low temperatures, the main product detected and measured was propene. The mathematical relations used for the calculation of adsorption-desorption rate constants, surface reaction rate constants and adsorption equilibrium constants for the reactant cyclohexane are different from previously studied catalytic reactions, owing to the different experimental arrangement for feeding the catalytic bed. The diffusion bands obtained experimentally for reactant or product are described by the sum of two or three exponential functions of time, respectively. From the exponential coefficients of time and the pre-exponential factors, all determined by simple PC programs, the above kinetic parameters are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267960
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