
TY  - JOUR
A1  - Shorter, John 
T1  - <emph type="2">From IUPAC</emph>.
Compilation and Critical Evaluation of Structure-Reactivity Parameters and Equations. II Extension of the Hammett <font face="symbol">s</font> Scale Through Data for the Ionization of Substituted Benzoic Acids in Aqueous Organic Solven
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1998
VL  - 51
IS  - 6
SP  - 525
EP  - 533
KW  - 
UR  - https://doi.org/10.1071/C98800 
N2  - Data have been compiled for the pK values in certain aqueous organic solvents at 25&#176;C of about 70 meta- or para-substituted benzoic acids, with a view to proposing values of Hammett constants, &#963;, in the case of substituents for which values cannot be based on the ionization of substituted benzoic acids in water (Part I). The emphasis of the work is on the use of data for the apparent pK values of the acids in 1 : 1 EtOH&#8211;H2O, i.e. a solvent made up of equal volumes of ethanol and water. A calibration equation is derived relating substituent effects measured in this solvent to those measured in water. On the basis of this equation s values are proposed for 25 substituents, although some of the values are subject to caveats, and several further substituents are also discussed. 
ER  -

