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]