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Advances in Physical Chemistry
Volume 2012 (2012), Article ID 598243, 4 pages
Research Article

Effect of Hetero Atom on the Hammett’s Reaction Constant () from the Physical Basis of Dissociation Equilibriums of (Dithio) Benzoic Acids and (Thio) Phenols and Its Application to Solvolysis Reactions and Some Free Radical Reactions

1Department of Chemistry, Osmania University, Hyderabad 500 007, India
2Department of Chemistry, Mizan-Tepi University, Tepi Campus, Tepi, Ethiopia

Received 3 April 2012; Accepted 11 May 2012

Academic Editor: Leonardo Palmisano

Copyright © 2012 Jagannadham Vandanapu and Sanjeev Rachuru. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The emergence of putative Hammett equation in mid 1930s was a boon to physical-organic chemists to elucidate the reaction mechanisms of several organic reactions. Based on the concept of this equation several hundreds of papers have emerged in chemical literature in the last century on the effect of structure, on reactivity, and very few on thermodynamic stability and kinetic reactivity of intermediates. In this article an attempt is made to explain the effect of hetero atom on Hammett’s reaction constant (ρ) taking the dissociation equilibriums of benzoic acids, dithiobenzoic acids, phenols, and thiophenols.