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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

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

  4. Atropisomer - Wikipedia

    en.wikipedia.org/wiki/Atropisomer

    Alternately, all four groups can be ranked by CahnIngoldPrelog 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]

  5. E–Z notation - Wikipedia

    en.wikipedia.org/wiki/E–Z_notation

    E–Z configuration, or the E–Z convention, is the IUPAC preferred method of describing the absolute stereochemistry of double bonds in organic chemistry.It is an extension of cis–trans isomer notation (which only describes relative stereochemistry) that can be used to describe double bonds having two, three or four substituents.

  6. 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.

  7. Category:Eponymous chemical rules - Wikipedia

    en.wikipedia.org/wiki/Category:Eponymous...

    Pages in category "Eponymous chemical rules" The following 22 pages are in this category, out of 22 total. ... CahnIngoldPrelog priority rules; F. Fajans' rules ...

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  9. 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]