Examlex
The range is usually considered to be a relatively crude measure of variability.
Antiaromatic
Compounds that possess conjugated pi electrons in cyclic structures but with destabilization due to unfulfilled criteria for aromatic stability.
Nonaromatic
Describes a compound that does not meet the criteria for aromaticity, lacking a cyclic, planar structure with a delocalized pi electron system over the ring.
Pyrene
A polycyclic aromatic hydrocarbon (PAH) consisting of four fused benzene rings, resulting in a flat aromatic system.
Huckel Rule
A rule that helps predict the aromaticity of planar rings based on the count of pi electrons, stating that aromatic compounds must have 4n+2 pi electrons.
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