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  • Chemistry  (3)
  • 1970-1974  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies in mixed aqueous media. II. Acidity Constants of Simple and Chloro-o-toluidinium Ions in the system dioxane-water (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 579-584 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acidity constants of 3-, 4- and 5-chloro-o-toluidinium ions have been measured at 25° in aqueous dioxane media containing 20, 45, 70 and 72 wt.% of 1.4-dioxane by pH metry. The necessary correction factors to convert pH meter readings into stoichiometric pH have been evaluated. The relation between the strength of anilinium ions and various solvent properties has been discussed. A HAMMETT type relation has been developed for correlating the acid strength of these disubstituted anilinium ions with HAMMETT's structural parameters.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130404
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  • 2
    Electronic Resource
    Electronic Resource
    Additivity of Substituent Effects in the reaction of phenacyl bromide with aromatic amines in ethanol (1972)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 314 (1972), S. 780-784 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate constants and the kinetic parameters of the reaction of phenacyl bromide with mono and disubstituted anilines in ethanol have been determined. The substituent effects on the free energy of activation have been found to be additive. HAMMETT equation for multiple substitution was applied to correlate reactivity with structural parameters. The substituent effect is separated into inductive and resonance effects.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19723140510
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  • 3
    Electronic Resource
    Electronic Resource
    Studies in mixed aqueous media. I. Acidity Constants of Isomeric Chloro-o-toluidinium Ions in the system ethanol-water (1970)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 312 (1970), S. 977-988 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acidity constants of 3, 4, 5 and 6-chloro-o-toluidinium ions are measured at 25°C in aqueous-ethanol solvents containing 0, 20, 35, 50, 65 and 80 wt% of ethanol by pH metry. The correction factor giving stoichiometric significance to pH meter readings have been evaluated for three different acid concentrations in each of the above mentioned solvent systems. Attempt has been made to correlate the strength of each of the anilinium ions with various solvent properties. HAMMETT-type relations have been derived for correlating acid strengths with structural properties.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19703120602
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    Paper (German National Licenses)
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