Preferred Label : Taft equation;
IUPAC definition : Various equations are associated with R.W. Taft, but the term is most often used to
designate the family of equations that emerged from Taft's analysis of the reactivities
of aliphatic esters, and which involved the polar substituent constant σ * and the
steric substituent constant E s: \[\log _{10}k \log _{10}k_{0} \rho {*}\ σ {*} Δ
\ E_{{s}}\] or the one-parameter forms applicable when the role of either the polar
term or the steric term may be neglected. Nowadays σ * is usually replaced by the
related constant σ I.;
Origin ID : T06247;
See also
Various equations are associated with R.W. Taft, but the term is most often used to
designate the family of equations that emerged from Taft's analysis of the reactivities
of aliphatic esters, and which involved the polar substituent constant σ * and the
steric substituent constant E s: \[\log _{10}k \log _{10}k_{0} \rho {*}\ σ {*} Δ
\ E_{{s}}\] or the one-parameter forms applicable when the role of either the polar
term or the steric term may be neglected. Nowadays σ * is usually replaced by the
related constant σ I.
