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For double bonded molecules, Cahn–Ingold–Prelog priority rules (CIP rules) are followed to determine the priority of substituents of the double bond. If both of the high priority groups are on the same side of the double bond (cis configuration), then the stereoisomer is assigned the configuration Z (zusammen, German word meaning "together").
Alternately, all four groups can be ranked by Cahn–Ingold–Prelog priority rules, with overall priority given to the two groups on the "front" atom of the Newman projection. The two configurations determined in this way are termed R a and S a , in analogy to the traditional R / S for a traditional tetrahedral stereocenter.
Absolute configuration uses a set of rules to describe the relative positions of each bond around the chiral center atom. The most common labeling method uses the descriptors R or S and is based on the Cahn–Ingold–Prelog priority rules. R and S refer to rectus and sinister, Latin for right and left, respectively.
Reglas de Cahn-Ingold-Prelog; Usage on fi.wikipedia.org Käyttäjä:Nitraus/A; Cahn–Ingold–Prelog-prioriteettisäännöt; Usage on ja.wikipedia.org カーン・インゴールド・プレローグ順位則; Usage on nl.wikipedia.org Cahn-Ingold-Prelog-prioriteitsregels; Usage on pt.wikipedia.org Regras de Cahn-Ingold-Prelog; Usage on ro ...
The designations are based on the same Cahn–Ingold–Prelog priority rules used for tetrahedral stereocenters. [3] The chiral axis is viewed end-on and the two "near" and two "far" substituents on the axial unit are ranked, but with the additional rule that the two near substituents have higher priority than the far ones. [4]
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The Cahn-Ingold-Prelog (CIP) system uses R and S designations to define the configuration of atoms about any stereocenter. [7] A designation of R denotes a clockwise direction of substituent priority around the stereocenter, while a designation of S denotes a counter-clockwise direction of substituent priority. [7]
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