Cahn-Ingold-Prelog sequence rules
- Cahn-Ingold-Prelog sequence rules
- in chemistry, a set of rules used to determine the absolute configuration of chiral molecules by assigning priority rankings to the atoms attached to a chiral center. Atoms directly attached to the chiral center are ranked in order of decreasing atomic number; if these are alike then the groups incorporating the atoms are ranked using the site of difference nearest the chiral center, with identical groups ranked on the basis of their nearest neighbors. Multiple bonds are treated as if the atoms of the bond are replicated once for each extra bond. Isotopes are ranked by descending atomic mass. See also E-, Z-, R-, and S-.
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Cahn–Ingold–Prelog priority rules — The Cahn–Ingold–Prelog priority rules, CIP system or CIP conventions 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 … Wikipedia
E- — exa [1018] * * * [Ger. entgegen opposite] a stereodescriptor used to specify the absolute configuration of rigid compounds, such as those having double bonds. The substituents attached to the double bonded carbons are ranked according to the Cahn … Medical dictionary
e- — negative electron * * * [Ger. entgegen opposite] a stereodescriptor used to specify the absolute configuration of rigid compounds, such as those having double bonds. The substituents attached to the double bonded carbons are ranked according to… … Medical dictionary
R- — [L. rectus right] a stereodescriptor used to specify the absolute configuration of compounds having asymmetric carbon atoms. The four different substituents at the asymmetric carbon atom are ranked according to the Cahn Ingold Prelog sequence… … Medical dictionary
Polyhedral symbol — The polyhedral symbol is sometimes used in coordination chemistry to indicate the approximate geometry of the coordinating atoms around the central atom. One or more italicised letters indicate the geometry, e.g. TP 3 which is followed by a… … Wikipedia
isomerism — /uy som euh riz euhm/, n. 1. Chem. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and… … Universalium
hydrocarbon — hydrocarbonaceous, adj. /huy dreuh kahr beuhn, huy dreuh kahr /, n. any of a class of compounds containing only hydrogen and carbon, as an alkane, methane, CH4, an alkene, ethylene, C2H4, an alkyne, acetylene, C2H2, or an aromatic compound,… … Universalium
Alkane — Not to be confused with Alkene or Alkyne. Chemical structure of methane, the simplest alkane Alkanes (also known as paraffins or saturated hydrocarbons) are chemical compounds that consist only of hydrogen and carbon atoms and are bonded… … Wikipedia
