Concerted reaction

{
  "id": "MLC-T-CHM-002377",
  "term": "Concerted reaction",
  "field": "Chemistry",
  "definition": "A reaction in which reactants are converted directly into products in a single step, through one transition state and without any intermediate. Bonds may be made and broken to unequal extents at the transition state, so concerted does not mean synchronous. The Diels-Alder reaction is a well-known example, and its two new bonds form to different degrees when the diene or dienophile is unsymmetrical.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "single-step reaction"
  ],
  "references": [
    "PAC, 1999, 71, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1930 (https://doi.org/10.1351/pac199971101919)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/concerted-reaction/"
}