Asian Journal of Chemical Sciences

There are two circumstances to consider every micro molecular organic compound: (a) near its similar non-isomeric combinations, i.e. an amino acid with other amino acids, an organic acid with other organic acids, a steroid with other steroids, etc., (b) exclusively with its isomers, as a constituent of a multitude generated by its molecular formula (MF). The latter approach is the aim of this paper, and if undertaken systematically it could constitute a new chapter of physical chemical sciences, chemical morphology.

MFs are inherently uncertain phenomena. They cannot be known and described but via the compounds they produce. Generation of isomers by a MF illustrates the big bang of micro molecular organic compounds, e.g. MF C₅₉ of alkanes produces about 2.66 Avogadro’s number of entities.

No matter how large a multitude is, five types of compounds only can be distinguished inside it: (A) meso, (B) C₂ symmetrical (C₂ symm.), (C) irrechi (configurational), (D) constitutional (constit.), (E) archaic (primitive). The molecule of meso isomers is characterized by two enantiomeric halves, and that of C₂ symm. by two identical chiral halves. The skeleton of irrechi molecule is similar to meso and C₂ symm., however the pattern of its chiral carbons is different. A combination whose MF is unable to produce a meso isomer, real or imaginary, is archaic (primitive). Two necessary and sufficient conditions have to be fulfilled by a compound to be constitutional (constit.): (i) to be devoid of chemical elements of symmetry at the level of its molecule and (ii) its MF be able to produce at least one meso isomer, real or imaginary.

constit Compounds are much more numerous in living things than meso, C₂ symm. and irrechi taken together. MFs including at least a meso isomer, real or imaginary, are the best proof that chemistry is a dualistic science.