Carbonium ion

{
  "id": "MLC-T-CHM-001650",
  "term": "Carbonium ion",
  "field": "Chemistry",
  "definition": "A carbocation in which the positively charged carbon atom is pentacoordinate, meaning it forms five bonds. This type of carbocation is characterized by a three-center, two-electron bond. The term 'carbonium ion' is now largely superseded by 'carbocation' for trivalent species, with 'carbonium ion' specifically referring to pentacoordinate species like the methanium ion (CH5+).",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "carbenium ion",
    "carbocation",
    "coordination number"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1093 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/carbonium-ion/"
}