CHEM&219 Unit 3 Nomenclature Exam with Correct Solutions

CHEM&219 Unit 3 Nomenclature Exam with Correct Solutions What is R/S nomenclature used for? - Answer -Naming each enantiomer of an enantiomer pair of a chiral molecule What is E/Z nomenclature used for? - Answer -Used for determining and naming the cis- or trans- nature of a substituted alkene. R/S Nomenclature of Enantiomers - Answer -The system used to name enantiomeric forms of a chiral molecule is known as the R/S system or the Cahn-Ingold-Prelog(CIP) system (after its developers). This system determines the direction of the "twist" of the groups attached to a stereocenter and incorporates a description of that direction into the name of the compound. One enantiomer will be known as the "R" enantiomer (from the Latin "rectus"), while the mirror image will be known as the "S" enantiomer (from the Latin "sinister"). E/Z system of nomenclature of Substituted Alkenes - Answer -A system for unambiguously naming alkene stereoisomers by assigning priorities to the two groups on each carbon of the double bond. The E isomer has the two higher-priority groups on opposite sides of the double bond, and the Z isomer has them on the same side. Steps for R/