Meso Compounds Systematization ‒ A Chemical Paradox among Inositols and a Group of Super-symmetric Combinations

Abstract

Meso Compounds have been defined by themselves, as well as by their relationship with another group of diastereomeric combinations, C2 symmetrical ones, isomer to meso. Every meso compound should present a homodimer equivalent able to display at least one C2 symmetrical isomer. Cahn-Ingold-Prelog test, however limited, is also valuable. A systematization of meso combinations includes the following types: (A) meso Homodimers possessing one super-symmetric isomer or two real or envisaged C2 symmetrical enantiomers; (B) meso Heterodimers with a binding support having geometric or optical symmetry (e.g. >CR2, etc.). (C) meso Heterodimers with a binding support devoid of symmetry (of the form >CRR’, etc.), seeable as meso, and provable in this way not by themselves but by their equivalent meso homodimers. A paradoxical behavior has been shown at one of inositol isomers, in comparison with the others. Moreover, a new group of compounds has been disclosed, which are concomitantly meso and C2 symmetrical, and of this reason they have been called super- symmetrical.