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Cahn-Ingold-Prelog system priority rules

CIP system (Cahn-Ingold-Prelog system) A method of producing a sequence rule used in the absolute description of stereoisomers in the R—S convention (see optical activity) or the E-Z CONVENTION. The rule is to consider the atoms that are bound directly to a chiral center (or to a double bond). The group in which this atom has the highest proton number has the highest priority. So, for example, in HCClBr(NH2), the order of priority is Br > Cl > NH2 > H. If two atoms are the same, the substituents are considered, with the substituents of highest proton... [Pg.50]

In the stereochemical nomenclature of coordination compounds, the procedure for assigning priority numbers to the ligating atoms of a mononuclear coordination system is based upon the standard sequence rules developed for chiral carbon compounds (the Cahn, Ingold, Prelog or CIP rules6, see Section IR-9.3.3.2). [Pg.44]

The absolute configuration system stems from the Cahn-Ingold-Prelog priority rules, which allow a precise description of a stereocenter without using any reference compound. In fact the basis is now the atomic number of the stereocenter substituents. [Pg.58]

FIGURE 1.9 cis trans (or Z/ ) stereochemistry. If a = a we use the cis/trans nomenclature, but if a a (which is the case for fatty adds because the terminus of the a group is the CH3 group and the terminus of the a group is carboxylate), we should more correctly use the Z/E system based on Cahn-Ingold-Prelog priority rules. In practice, it must be noted that most people still use the cis/treats system for the stereochemistry of fatty acids. [Pg.10]

Use the Cahn-Ingold-Prelog rules outlined in ChemActivity 6, Model 11. Recall that priority is assigned based on atomic number with a card game system for breaking ties (see example below). [Pg.167]


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See also in sourсe #XX -- [ Pg.192 ]

See also in sourсe #XX -- [ Pg.182 ]




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Cahn Ingold Prelog system

Cahn-Ingold-Prelog

Cahn-Ingold-Prelog priority

Cahn-Ingold-Prelog rules

Ingold

Prelog

Prelog rule

Priorities

Priority rules

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