Summary:
A pseudo-asymmetric centre is found in a meso molecule where a plane of symmetry runs through a stereogenic centre and that stereogenic centre’s two substituents are constitutionally the same (same atoms connected by the same type of bonds) but configurationally different (spatially different). In this situation the substituent with R has a higher priority than the substituent with S and the pseudo-asymmetric centre is described as r or s.
Key Words:
Pseudo-Asymmetric, meso, Stereogenic centre, constitutional, configurational, R, S, r, s, CIP, Cahn, Ingold, Prelog