A multiparameter extension of the
Hammett equation to quantify the role of enhanced
resonance effects on the
reactivity of
meta- and
para-substituted benzene derivatives, e.g.
The parameter
gives the enhanced
resonance effect on the scale
(
)
or
(
), respectively.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1176
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.
doi:10.1351/goldbook.
