Anti

{
  "id": "MLC-T-CHM-000659",
  "term": "Anti",
  "field": "Chemistry",
  "definition": "A stereochemical descriptor for groups lying on opposite faces of a reference plane, the counterpart of syn, for groups on one face. For two substituents on neighbouring atoms linked through a single bond, anti applies when the torsion angle between them is larger than 90 degrees, and the narrower antiperiplanar case spans 150 to 180 degrees. In butane the antiperiplanar arrangement of the two methyl groups is the lowest-energy conformer.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "endo, exo, syn, anti",
    "chemical reaction",
    "dihedral angle",
    "elimination",
    "oximes",
    "stereoisomers",
    "antarafacial",
    "syn",
    "torsion angle",
    "cis, trans",
    "transformation"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1084 (https://doi.org/10.1351/pac199466051077)",
    "PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2199 (https://doi.org/10.1351/pac199668122193)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/anti/"
}