antiaromatic

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antiaromatic

[‚an·tē‚ar·ə′mad·ik]
(chemistry)
A cyclic compound with delocalized electrons that does not obey Hückel's rule, and is much less stable than similar nonaromatic compounds.
References in periodicals archive ?
The following topics are covered: tracking aromaticity and antiaromaticity based on n-DIs, applications of n- DIs, and multicenter electron delocalization in all-metal compounds.
The last example of the synthesis of a simple, stable molecule with the electronic configuration of antiaromaticity -- cyclooctatetraene -- was in 1913.
Multiple Aromaticity, Multiple Antiaromaticity, and Conflicting Aromaticity in Planar Clusters
The 14 chapters of part one discuss topics such as the physical properties and theoretical studies of cyclobutane; antiaromaticity and aromaticity in carbocyclic four-membered rings; thermochemistry of cyclobutane and its derivatives; NMR (nuclear magnetic resonance) spectroscopy of cyclobutanes; conformation and configuration as stereochemical aspects of cyclobutane; synthesis of cyclobutanes; the application of cyclobutane derivatives in organic synthesis; structural effects of the cyclobutyl group on reactivity and properties; cation radicals in the synthesis and reactions of cyclobutanes; and highly unsaturated cyclobutane derivatives.