Source: wikibot/hammett-equation
= Hammett equation
{wiki=Hammett_equation}
The Hammett equation is a mathematical expression used in physical organic chemistry to relate reaction rates and equilibrium constants of reactions involving substituted aromatic compounds to the electronic effects of the substituents. It provides a quantitative measure of how substituents (such as -NO2, -Cl, -CH3, etc.) influence the reactivity of the aromatic compound in electrophilic or nucleophilic reactions.