Cheletropic reaction

{
  "id": "MLC-T-CHM-001930",
  "term": "Cheletropic reaction",
  "field": "Chemistry",
  "definition": "A pericyclic reaction, a form of cycloaddition or its reverse, in which two new sigma bonds form to a single atom of one reactant, or two sigma bonds to one atom break, while the other component reacts through the terminal atoms of a conjugated system. The coordination number of that single atom changes by two. Sulfur dioxide adds to butadiene in this way to give 3-sulfolene, 2,5-dihydrothiophene 1,1-dioxide.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "addition",
    "conjugated system",
    "coordination number",
    "cycloaddition",
    "elimination"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1094 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/cheletropic-reaction/"
}