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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 .;

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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 .

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29/07/2025


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