Aromatic

{
  "id": "MLC-T-CHM-000784",
  "term": "Aromatic",
  "field": "Chemistry",
  "definition": "Describing a ring-shaped, fully conjugated molecule whose measured stability exceeds what would be expected for a single hypothetical structure with localized double bonds, such as one Kekulé formula. The extra stabilization comes from delocalization of pi electrons around the ring. A planar monocyclic system is aromatic when it holds 4n + 2 pi electrons, with n a non-negative integer, as in benzene with six.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Hückel (4n + 2) rule",
    "Kekulé structure",
    "Möbius aromaticity",
    "aromaticity",
    "conjugated system",
    "delocalization",
    "ground state",
    "pericyclic reaction",
    "stable",
    "transition state"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1086 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/aromatic/"
}