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  2. Cahn–Ingold–Prelog priority rules - Wikipedia

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

    In organic chemistry, the Cahn–IngoldPrelog (CIP) sequence rules (also the CIP priority convention; named after Robert Sidney Cahn, Christopher Kelk Ingold, and Vladimir Prelog) are a standard process to completely and unequivocally name a stereoisomer of a molecule.

  3. 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.

  4. Chiral drugs - Wikipedia

    en.wikipedia.org/wiki/Chiral_drugs

    In general the D/L system of nomenclature is superseded by the Cahn-Ingold-Prelog (CIP) rule to describe the configuration of a stereogenic/chiral center. In the CIP or R/S convention, or sequence rule, the configuration, spatial arrangements of ligands/substituents around a chiral center, is labeled as either "R" or "S".

  5. 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 ...

  6. 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]

  7. 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 ...

  8. Allenes - Wikipedia

    en.wikipedia.org/wiki/Allenes

    Where A has a greater priority than B according to the Cahn–IngoldPrelog priority rules, the configuration of the axial chirality can be determined by considering the substituents on the front atom followed by the back atom when viewed along the allene axis. For the back atom, only the group of higher priority need be considered.

  9. Chirality timeline - Wikipedia

    en.wikipedia.org/wiki/Chirality_timeline

    Robert Sidney Cahn: British Devised R/S and E/Z notations; Cahn–IngoldPrelog priority rules [33] 1956/1966 Christopher Kelk Ingold: British Co-author of Cahn–IngoldPrelog priority rules; Did groundbreaking work (between 1920-30s) on reaction mechanisms and the electronic structure of organic compounds [33] 1956/1966 Vladimir Prelog ...