selectivity factor, Sf

https://doi.org/10.1351/goldbook.S05567
A quantitative representation of
selectivity
in
aromatic
substitution reactions
(usually
electrophilic
, for monosubstituted benzene derivatives). If the
partial rate factor
, f, expresses the reactivity of a specified position in the aromatic compound PhX relative to that of a single position in benzene, then the
selectivity
factor Sf (expressing discrimination between p- and m-positions in PhX) is defined as: Sf=log10(fpXfmX)
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1162 [Terms] [Paper]