Various equations are associated with R.W. Taft, but the term is most often used to
designate the family of equations that emerged from Taft's analysis of the reactivities
of aliphatic
esters, and which involved the polar substituent constant
and the steric substituent constant
:
or the one-parameter forms applicable when the role of either the polar term or the
steric term may be neglected. Nowadays
is usually replaced by
the related constant
.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1171
Cite as:
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: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
