https://doi.org/10.1351/goldbook.H02732
The equation in the form: or applied to the influence of meta- or para-substituents X on the reactivity of the or is the rate or or refers to the reaction of C6H5Y, i.e. X = H; is the substituent constant characteristic of m- or p-X: is the reaction constant characteristic of the given reaction of Y. The equation is often encountered in a form with or written as a separate term on the right hand side, e.g. or It then signifies the intercept corresponding to X = H in a regression of or on .
functional group
Y in the benzene derivative m- or p-XC6H4Y. equilibrium constant
, respectively, for the given reaction of m- or p-XC6H4Y; See also:
ρ-value
, σ-constant
, Taft equation
, Yukawa–Tsuno equation