Many definitions that describe a specific conformation (IUPAC Gold Book) exist:
- a torsion angle of ±60° is called gauche
- a torsion angle between 0° and ± 90° is called syn (s)
- a torsion angle between ± 90° and 180° is called anti (a)
- a torsion angle between 30° and 150° or between –30° and –150° is called clinal
- a torsion angle between 0° and 30° or 150° and 180° is called periplanar (p)
- a torsion angle between 0° to 30° is called synperiplanar or syn- or cis-conformation (sp)
- a torsion angle between 30° to 90° and –30° to –90° is called synclinal or gauche or skew (sc)
- a torsion angle between 90° to 150°, and –90° to –150° is called anticlinal (ac)
- a torsion angle between ± 150° to 180° is called antiperiplanar or anti or trans (ap).
Torsional strain results from resistance to twisting about a bond.
Read more about this topic: Stereochemistry
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