The Cahn–Ingold–Prelog priority rules, CIP system or CIP conventions (after Robert Sidney Cahn, Christopher Kelk Ingold and Vladimir Prelog) are a set of rules used in organic chemistry to name the stereoisomers of a molecule. A molecule may contain any number of stereocenters and any number of double bonds, and each gives rise to two possible configurations. The purpose of the CIP system is to assign an R or S descriptor to each stereocenter and an E or Z descriptor to each double bond so that the configuration of the entire molecule can be specified uniquely by including the descriptors in its systematic name.
The key article by the three authors setting out the CIP rules was published in 1966.
The Cahn–Ingold–Prelog rules are distinctly different from those of other naming conventions, such as general IUPAC nomenclature, since they are designed for the specific task of naming stereoisomers rather than the general classification and description of compounds.
Other articles related to "rules, priority":
... The same rules that determine the stereochemistry of a stereocenter (R or S) also apply when assigning the face of a molecular group ... re-face will not always lead to an S stereocenter, as the priority of the chemical group has to be taken into account ...
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