The traditional name for a tetrahedrally coordinated carbon atom bonded to four different
entities, two and only two of which have the same
constitution but opposite
chirality sense. The
r/s descriptors of pseudo-
asymmetric carbon atoms are invariant on reflection in a mirror (i.e.
r remains
r, and
s remains
s), but are reversed by the exchange of any two entities (i.e.
r becomes
s, and
s becomes
r). An example is C-3 of ribaric (C-3 is
r) or xylaric acid (C-3 is
s) or hyoscyamine (C-3 is
r). The hyphen in pseudo-
asymmetric may be omitted.
Source:
PAC, 1996, 68, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2214
InChI=1/C5H8O7/c6-1(2(7)4(9)10)3(8)5(11)12/h1-3,6-8H,(H,9,10)(H,11,12)/f/h9,11H
InChI=1/C5H8O7/c6-1(2(7)4(9)10)3(8)5(11)12/h1-3,6-8H,(H,9,10)(H,11,12)/f/h9,11H
InChI=1/C17H21NO4/c1-18-12-7-8-13(18)10-14(9-12)22-17(21)15(16(19)20)11-5-3-2-4-6-11/h2-6,12-15H,7-10H2,1H3,(H,19,20)/t12?,13?,14?,15-/m1/s1/f/h19H
NPTTZSYLTYJCPR-FLKJISBTCY
NPTTZSYLTYJCPR-FLKJISBTCY
QDTDAWBMOSCLIB-YXIHWNHFDT
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.
