Preferred Label : extended Hammett equation;
IUPAC definition : This term applies in a general way to any multiparametric extension of the Hammett
equation. It is sometimes used specifically for a form of dual substituent-parameter
equation in which the actual value of the correlated property P under the influence
of the substituent X is used, rather than the value relative to that for X H. An
intercept term h corresponding to the value of P for X H is introduced, e.g. \[P
\alpha \ σ _{I} \beta \ σ _{R} h\] The equation may be applied to systems for which
the inclusion of further terms to represent other effects, e.g. steric, is appropriate.;
Origin ID : E02279;
See also
This term applies in a general way to any multiparametric extension of the Hammett
equation. It is sometimes used specifically for a form of dual substituent-parameter
equation in which the actual value of the correlated property P under the influence
of the substituent X is used, rather than the value relative to that for X H. An
intercept term h corresponding to the value of P for X H is introduced, e.g. \[P
\alpha \ σ _{I} \beta \ σ _{R} h\] The equation may be applied to systems for which
the inclusion of further terms to represent other effects, e.g. steric, is appropriate.
