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United States (324,846)
Chemistry (249)
CHEM 341 (46)
Lecture

Enantiomers, R/S classification, priority rules, Fischer projections

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Department
Chemistry
Course
CHEM 341
Professor
Debbie Crans
Semester
Fall

Description
19 September Each optically active compound has its own specific rotation Two enantiomers have specific rotations with opposite signs Enantiomers A pair of molecules that are non-superimposable mirror images Models needed to convince yourself whether they are superimposable R/S Nomenclature Naming System Enantiomers are identical in all respects – except the direction they rotate plane polarized light – other physical properties are the same (mp, bp, density, &c.) Naming system indicates substituents in space – the R/S system Priority Rules (Cahn – Ingold – Prelog) Greater atom number – higher priority Same atoms? Move to neighbors and apply rule #1 Note: atomic numbers do not add up, one group with higher atomic number overrules two (or more) with a smaller one Multiple bonds? Add a neighboring atom for each extra bond Isotopes?
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