" /> cross-conjugation - CISMeF





Preferred Label : cross-conjugation;

IUPAC definition : In a system XC sub 6 /sub H sub 4 /sub GY this is conjugation involving the substituent X, the benzene ring and the side-chain connective-plus-reaction site GY, i.e. either X is a i R /i group and GY is a - i R /i group, or X is a - i R /i group and GY is a i R /i group. In Hammett correlations this situation can lead to the need to apply exalted substituent constants σ or σ-, respectively, as in electrophilic or nucleophilic aromatic substitution, respectively. The term 'through resonance' is synonymous. Cross conjugation has also been used to describe the interactions occurring in 2-phenylallyl and similar systems.;

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In a system XC sub 6 /sub H sub 4 /sub GY this is conjugation involving the substituent X, the benzene ring and the side-chain connective-plus-reaction site GY, i.e. either X is a i R /i group and GY is a - i R /i group, or X is a - i R /i group and GY is a i R /i group. In Hammett correlations this situation can lead to the need to apply exalted substituent constants σ or σ-, respectively, as in electrophilic or nucleophilic aromatic substitution, respectively. The term 'through resonance' is synonymous. Cross conjugation has also been used to describe the interactions occurring in 2-phenylallyl and similar systems.

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30/07/2025


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