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  2. Cahn–Ingold–Prelog priority rules - Wikipedia

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

    For double bonded molecules, CahnIngoldPrelog 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. Absolute configuration - Wikipedia

    en.wikipedia.org/wiki/Absolute_configuration

    The R/S system is an important nomenclature system for denoting enantiomers. This approach labels each chiral center R or S according to a system by which its substituents are each assigned a priority, according to the CahnIngoldPrelog priority rules (CIP), based on atomic number.

  4. 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 ...

  5. 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]

  6. Axial chirality - Wikipedia

    en.wikipedia.org/wiki/Axial_chirality

    The designations are based on the same CahnIngoldPrelog 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]

  7. Allenes - Wikipedia

    en.wikipedia.org/wiki/Allenes

    Where A has a greater priority than B according to the CahnIngoldPrelog 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.

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  9. Stereochemistry - Wikipedia

    en.wikipedia.org/wiki/Stereochemistry

    CahnIngoldPrelog priority rules are part of a system for describing a molecule's stereochemistry. They rank the atoms around a stereocenter in a standard way, allowing unambiguous descriptions of their relative positions in the molecule.