Regarding Enumeration of Molecular Isomers

In this paper, a simple theoretical approach to counting of substitution isomers is described. It is based on Polyaʹs theorem and on point groups as recently described by us [Baraldi, 1.; Fiori, C.; Vanossi, D. J. Math. Chem. 1999, 25, 23-30] and extended in this paper. Several applications are developed that range from molecules without symmetry to molecules with icosahedral symmetry (Ih). The problem of the appearance of stereoisomers is also analyzed.