Torsion angle

{
  "id": "MLC-T-CHM-012124",
  "term": "Torsion angle",
  "field": "Chemistry",
  "definition": "The dihedral angle between two planes defined by four sequentially bonded atoms, typically denoted as A-B-C-D. It describes the relative orientation of two parts of a molecule around a central bond. A torsion angle of 0° indicates a syn-periplanar conformation, while 180° indicates an anti-periplanar conformation.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Newman projection",
    "angle",
    "anti",
    "conformation",
    "dihedral angle",
    "eclipsed",
    "gauche",
    "macromolecule",
    "syn",
    "cis, trans"
  ],
  "references": [
    "PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2220 (https://doi.org/10.1351/pac199668122193)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/torsion-angle/"
}