## Wikipedia - Edwards equation (en) Wikipedia - Nucleophile (en) Wikipedia - Nucleófilo (gl) Wikipedia - Nukleofil (hu) Wikipedia - Нуклеофил (ru) Swain–Scott equation

https://doi.org/10.1351/goldbook.S06201
The @L03551@ of the form: $\log _{10}(\frac{k}{k_{0}})=s\ n$ applied to the variation of @R05180@ of a given @E02020@ @S06082@ towards a series of nucleophilic reagents. $$n$$ is characteristic of the @R05190@ (i.e. a measure of its @N04251@) and $$s$$ is characteristic of the substrate (i.e. a measure of its sensitivity to the @N04251@ of the @R05190@). A scale of $$n$$ values is based on the rate coefficients $$k$$ for the reaction of methyl bromide with nucleophiles in water at $$25\ ^{\,\unicode{x26ac}}\text{C}$$, $$s$$ being defined as 1.00 for these reactions and $$n$$ being defined as 0.00 for the @H02902@ of methyl bromide. (Other scales have been devised.)
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1169 [Terms] [Paper]