Norrish Type II photoreaction

{
  "id": "MLC-T-CHM-008081",
  "term": "Norrish Type II photoreaction",
  "field": "Chemistry",
  "definition": "A photochemical reaction of carbonyl compounds containing a hydrogen atom on the gamma-carbon, involving intramolecular hydrogen abstraction by the excited carbonyl oxygen. This abstraction leads to the formation of a 1,4-biradical intermediate. The biradical can then undergo cyclization to form a cyclobutanol or cleavage to yield an alkene and an enol.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "intramolecular",
    "abstraction"
  ],
  "references": [
    "PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 375 (https://doi.org/10.1351/pac200779030293)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/norrish-type-ii-photoreaction/"
}