Pseudopericyclic

{
  "id": "MLC-T-CHM-009639",
  "term": "Pseudopericyclic",
  "field": "Chemistry",
  "definition": "A concerted reaction whose bonding changes occur around a cyclic array of atoms, with at least one atom where a nonbonding and a bonding orbital exchange roles, breaking the continuous orbital overlap around the ring. Because the transition state is not fully conjugated, the orbital symmetry restrictions of the Woodward-Hoffmann type do not apply. The enol-to-enol proton shift in acetylacetone is a formal example.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "concerted process",
    "conjugated system",
    "orbital symmetry",
    "pericyclic reaction"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1154 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/pseudopericyclic/"
}