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'Solvent Effect' in keywords Facet   Publication Year 1978  [X]
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1Author    FayezY. Khalil, M. T. HannaRequires cookie*
 Title    Kinetic Study of the Acid Hydrolysis of Ethyl Hydrogen Succinate in Binary Solvent Mixtures  
 Abstract    The specific rate constants for the acid-catalysed hydrolysis of ethyl hydrogen succinate in water and in a series of acetone-water and dioxane-water mixtures were determined at 30-45 °C. The solvent composition covered the range 0-90% by weight of the organic solvent. The rate was found to decrease to a minimum at about 80% of the organic solvent then to increase again with successive addition of the latter. In dioxane-water medium a slight initial increase in rate on the first addition of dioxane to water was observed and attributed to an increase in the number of "free" water molecules. The activation energy showed only slight dependence on solvent composition. The radius of the activated complex was calculated in the two media. The thermodynamic parameters were evaluated and discussed in terms of solvent composition. The reaction proved to be essentially an ion-dipole rather than an ion-ion interaction. A comparative discussion of the specific solvent effects of the two solvent systems under consideration is presented, based on the respective bond energies as given by the heats of mixing of the solvent components. 
  Reference    Z. Naturforsch. 33b, 1479—1483 (1978); received April 25 1978 
  Published    1978 
  Keywords    Ethyl Hydrogen Succinate, Acid Hydrolysis, Kinetics, Solvent Effects, Thermodynamic Parameters 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1479.pdf 
 Identifier    ZNB-1978-33b-1479 
 Volume    33