Preferred Label : conjugated system;
Detailed label : conjugated system (conjugation);
IUPAC definition : In the original meaning a conjugated system is a molecular entity whose structure
may be represented as a system of alternating single and multiple bonds: e.g. CH sub
2 /sub CH–CH CH sub 2 /sub , CH sub 2 /sub CH–C N. In such systems, conjugation
is the interaction of one p-orbital with another across an intervening σ-bond in such
structures. (In appropriate molecular entities d-orbitals may be involved.) The term
is also extended to the analogous interaction involving a p-orbital containing an
unshared electron pair, e.g. :Cl–CH CH sub 2 /sub .;
Origin ID : C01267;
See also
In the original meaning a conjugated system is a molecular entity whose structure
may be represented as a system of alternating single and multiple bonds: e.g. CH sub
2 /sub CH–CH CH sub 2 /sub , CH sub 2 /sub CH–C N. In such systems, conjugation
is the interaction of one p-orbital with another across an intervening σ-bond in such
structures. (In appropriate molecular entities d-orbitals may be involved.) The term
is also extended to the analogous interaction involving a p-orbital containing an
unshared electron pair, e.g. :Cl–CH CH sub 2 /sub .
