Topic Details (Notes format)

R/S Configuration

Subject: Chemistry

Book: General Chemistry

The R/S system (Cahn–Ingold–Prelog rules) assigns priorities to substituents on a chiral center. R (rectus) indicates a clockwise arrangement of priorities, and S (sinister) indicates a counterclockwise arrangement. This nomenclature precisely denotes stereochemistry in complex molecules. Understanding R/S is crucial in synthesis, as different enantiomers can have dramatically different biological or pharmacological effects.

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