Yukawa–Tsuno equation

https://doi.org/10.1351/goldbook.Y06734
A multiparameter extension of the @H02732@ to quantify the role of enhanced @M03844@ on the reactivity of meta- and para-substituted benzene derivatives, e.g. \[\log _{10}k = \log _{10}k_{0}+\rho \ [\sigma +r\ (\sigma^{+}-\sigma)]\] The parameter \(r\) gives the enhanced @M03844@ on the scale (\(\sigma ^{+}\,-\sigma\)) or (\(\sigma\,-\sigma \)), respectively.
See also:
ρ-value
,
σ-constant
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1176 [Terms] [Paper]