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Grunwald–Winstein equation

The linear free energy relation:
log 10 ( k s k 0 ) = m Y
expressing the dependence of the rate of solvolysis of a substrate on ionizing power of the solvent. The rate constantk 0 applies to the reference solvent (ethanol–water, 80:20, v/v) and k s 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:
log 10 ( k s k 0 ) = 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.
PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1118
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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