Hantz-Widman system

'Hantz-Widman system' can also refer to...


More Like This

Show all results sharing this subject:

  • Chemistry


Show Summary Details

Quick Reference

A system for naming heterocyclic compounds, independently introduced for naming 5- and 6- membered nitrogen monocyclic compounds by A. Hantzsch (1887) and O. Widman (1888). Subsequently it was extended to other ring sizes and other heteroatoms. It is based on prefixes denoting the hetero atoms(s) (e.g. aza- for nitrogen, thia- for sulphur, oxa- for oxygen), and items denoting ring size and saturation. For example, 4- membered rings have ete for unsaturated rings and etane for saturated; 5- membered rings have ole for unsaturated and olane for saturated compounds. Rules are given for naming compounds with two or more different heteroatoms and for numbering the atoms. The system is widely used both for monocyclic compounds and for heterocyclic components of polycyclic compounds.

http://www.chem.qmul.ac.uk/iupac/hetero/HW.html Information about IUPAC nomenclature

Subjects: Chemistry.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.