کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1345084 | 1500345 | 2014 | 21 صفحه PDF | دانلود رایگان |
The stereoisogram approach presupposes three distinct pairs of attributes, that is, chirality/achirality, RS-stereogenicity/RS-astereogenicity, and sclerality/asclerality, which are integrated into RS-stereoisomerism represented by stereoisograms. The mathematical rationalization of the three pairs of attributes is in sharp contrast to the presumption of a single pair of attributes (i.e., chirality/achirality) supporting modern stereochemistry. Thus, a pair of R/S-stereodescriptors of the Cahn–Ingold–Prelog (CIP) system is clarified to be assigned to a pair of RS-diastereomers, not to a pair of enantiomers. In particular, the ‘units’ of the CIP system (e.g., ‘chirality units’, ‘stereogenic units’, and ‘pseudoasymmetric units’) are replaced by promolecules having type-I, type-III, or type-V stereoisograms; the ‘chirality rule’ of the CIP system is replaced by the RS-stereogenicity rule of the stereoisogram approach; as well as the use of ‘reflection invariance’ for ‘pseudoasymmetric units’ being avoided by developing the concept of chirality faithfulness/unfaithfulness. Global and local symmetries are discussed in terms of correlation diagrams of stereoisograms.
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Journal: Tetrahedron: Asymmetry - Volume 25, Issues 16–17, 15 September 2014, Pages 1169–1189