Preferred Label : electromeric effect;
IUPAC definition : A molecular polarizability effect occurring by an intramolecular electron displacement
(sometimes called the 'conjugative mechanism' and, previously, the 'tautomeric mechanism')
characterized by the substitution of one electron pair for another within the same
atomic octet of electrons. It can be indicated by curved arrow symbolizing the displacement
of electron pairs, as in: which represents the hypothetical electron shift The term
has been deemed obsolescent or even obsolete (see mesomeric effect, resonance effect).
It has long been custom to use phrases such as 'enhanced substituent resonance effect'
which imply the operation of the electromeric effect, without using the term, and
various modern theoretical treatments parametrize the response of substituents to
'electronic demand', which amounts to considering the electromeric effect together
with the inductomeric effect.;
Origin ID : E01973;
See also
A molecular polarizability effect occurring by an intramolecular electron displacement
(sometimes called the 'conjugative mechanism' and, previously, the 'tautomeric mechanism')
characterized by the substitution of one electron pair for another within the same
atomic octet of electrons. It can be indicated by curved arrow symbolizing the displacement
of electron pairs, as in: which represents the hypothetical electron shift The term
has been deemed obsolescent or even obsolete (see mesomeric effect, resonance effect).
It has long been custom to use phrases such as 'enhanced substituent resonance effect'
which imply the operation of the electromeric effect, without using the term, and
various modern theoretical treatments parametrize the response of substituents to
'electronic demand', which amounts to considering the electromeric effect together
with the inductomeric effect.
