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
allenesabC=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
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
