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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