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  2. Cahn–Ingold–Prelog priority rules - Wikipedia

    en.wikipedia.org/wiki/CahnIngoldPrelog...

    For double bonded molecules, Cahn–IngoldPrelog 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").

  3. Axial chirality - Wikipedia

    en.wikipedia.org/wiki/Axial_chirality

    The designations are based on the same Cahn–IngoldPrelog 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]

  4. Stereocenter - Wikipedia

    en.wikipedia.org/wiki/Stereocenter

    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]

  5. Absolute configuration - Wikipedia

    en.wikipedia.org/wiki/Absolute_configuration

    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–IngoldPrelog priority rules. R and S refer to rectus and sinister, Latin for right and left, respectively.

  6. Vladimir Prelog - Wikipedia

    en.wikipedia.org/wiki/Vladimir_Prelog

    In 1954 he joined R. S. Cahn and Christopher Ingold in their efforts to build a system for specifying a particular stereoisomers by simple and unambiguous descriptors that could be easily assigned and deciphered: The CIP system (Cahn-Ingold-Prelog) was developed for defining absolute configuration using "sequence rules". Together they published ...

  7. Atropisomer - Wikipedia

    en.wikipedia.org/wiki/Atropisomer

    Alternately, all four groups can be ranked by Cahn–IngoldPrelog 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. [12]

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  9. Robert Sidney Cahn - Wikipedia

    en.wikipedia.org/wiki/Robert_Sidney_Cahn

    Robert Sidney Cahn (9 June 1899 – 15 June 1981) was a British chemist, best known for his contributions to chemical nomenclature and stereochemistry, particularly by the Cahn–IngoldPrelog priority rules, which he proposed in 1956 with Christopher Kelk Ingold and Vladimir Prelog. [1] Cahn was the first to report the structure of ...