The Effect of Structure upon the Reactions of Organic Compounds. Benzene Derivatives Louis P. Hammett J. Am. Chem. Soc.; 1937; 59(1); 96-103 Abstract
Some Relations between Reaction Rates and Equilibrium Constants. Louis P. Hammett Chem. Rev.; 1935; 17(1); 125-136 Abstract
These values are the original values obtained by Hammett in his1937 publication and may differ from subsequent publications by others. The following review contains more commonly accepted substituent constants: C. Hansch, A. Leo and R. W. Taft Chem. Rev.; 1991; 91; 165-195 Abstract
M. Bols, X. Liang, H. H. Jensen "Equatorial contra axial polar substituents. The Relation of a Chemical Reaction to Stereochemical Substituent Constants." J. Org. Chem.2002; 67; 8970-74. Abstract
doi.org
Table values are this original 1937 publication, and differ from values appearing in subsequent publications. For more standard vales, see: C. Hansch; A. Leo; R. W. Taft (1991). “A survey of Hammett substituent constants and resonance and field parameters”. Chem. Rev.91 (2): 165–195. doi:10.1021/cr00002a004.
