Theory of organic stereoisomerism in harmony with molecular symmetry
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A new theory of stereoisomerism in harmony with molecular symmetry has been developed by starting from RS-stereoisomeric groups correlated to stereoisograms and their correlation diagrams. The substitution positions of a stereoskeleton are permuted by a set of epimerizations at the RS-stereogenic centers of the stereoskeleton. The product of epimerizations and the mirror-image transformation of the skeleton characterize the total feature of isomerization, which is based on the axiom of organic stereoisomerism. Then, stereoisomeric groups are formulated to develop the theory of stereoisomerism after several related groups are defined, e.g., stereoisogram groups, epimerization groups, local symmetry groups, epimeric stereoisogram groups, epimeric RS-stereoisomeric groups, and multiple epimerization groups. On the basis of the stereoisomeric groups, stereoisomeric representations are derived and employed to discuss correlation diagrams of stereoisograms. On the other hand, molecular-symmetry representations are derived from the stereoisomeric groups and employed to discuss molecular symmetries. Typical topics of stereochemistry, e.g., the CIP system for giving RS-stereodescriptors and the Fischer-Rosanoff convention for naming dl-series of sugars, are discussed on the basis of the present theory.
KeywordsStereoisomerism Stereochemistry Enantiomerism RS-diastereomerics RS-stereoisomeric Stereoisogram Correlation diagram RS-stereodescriptors Molecular symmetry Cyclobutane
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