Families of Permutation Isomers
The molecules of a pure and uniform chemical compound X are all chemically identical; although they may differ in shape at a given time, they interconvert spontaneously under the observation conditions. In chemistry it is customary to represent the stereochemistry of X by drawing some projection formula of a representative “molecular situation” belonging to X.
KeywordsEquivalence Class Equivalence Relation Reference Model Dieter Group Skeletal Site
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- J. Ugi, H. Klusacek, G. Gokel, P. Hoffmann and P. Gillespie, Angew. Chem., 82, 741 (1970); Angew. Chem. Int. Ed., 9, 703 (1970); see also: D. J. Klein and A. H. Cowley, J. Amer. Chem. Soc., 97, 1633 (1975); Hässelbarth and E. Ruch, Isr. J. Chem. 15, 112 (1977); R. Kopp, Dissertation, Techn. Universität München, 1979.CrossRefGoogle Scholar
- The representation of permutational isomers by ligand permutations alone, without any explicit reference to skeletal indexing and to representations of skeletal symmetry  is an essential feature in the theory of chemical identity groups, enabling us to avoid the conceptual difficulties which arise from double indexing. In double indexing systems the ligands and the skeleton are indexed independently, or the indices of the skeletal sites are assigned to the ligands which belong to the respective sites .Google Scholar
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