axial chirality 

https://doi.org/10.1351/goldbook.A00547
Term used to refer to stereoisomerism resulting from the non-planar arrangement of four groups in pairs about a chirality axis. It is exemplified by allenes
abC=C=Ccd
(or
abC=C=Cab
) and by the atropisomerism of ortho-substituted biphenyls. The configuration in molecular entities possessing axial chirality is specified by the stereodescriptors Ra and Sa (or by P or M).
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2201 [Terms] [Paper]
Citation: 'axial chirality' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.A00547 RIS BibTex EndNote
Div. IIIPDFTextXMLJSON
Last revised: February 24, 2014