Grunwald–Winstein equation 

https://doi.org/10.1351/goldbook.G02710
The linear free energy relation: log10⁡(ksk0)=m Y expressing the dependence of the rate of solvolysis of a substrate on ionizing power of the solvent. The rate constant k0 applies to the reference solvent (ethanol–water, 80:20, v/v) and ks to the solvent s, both at 25 ⚬C. The parameter m is characteristic of the substrate and is assigned the value unity for tert-butyl chloride. The value Y is intended to be a quantitative measure of the ionizing power of the solvents. The equation was later extended to the form: log10⁡(ksk0)=m Y+l N where N is the nucleophilicity of the solvent and l its susceptibility parameter. The equation has also been applied to reactions other than solvolysis.
See also: Dimroth–Reichardt ET parameter, polarity, Z-value
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1118 [Terms] [Paper]
Citation: 'Grunwald–Winstein equation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.G02710 RIS BibTex EndNote
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Last revised: February 24, 2014