Yukawa–Tsuno equation
A multiparameter extension of the Hammett equation to quantify the role of enhanced resonance effects on the reactivity of meta- and para-substituted benzene derivatives, e.g.
Math - e
The parameter Math - ei gives the enhanced resonance effect on the scale (Math - ei) or (Math - ei), 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