Nomenclature - Lecture Notes | York University - Edubirdie

University:
York University
Course:
CHEM 1000 | Chemical Structure
Academic year:

2021
Views:

438

Pages:

3
Author:

Niklas

Nomenclature: CIP Rules Enantiomers can be R or S (w/ 1 chiral center) EX: Chiral center R or S? Absolute Configuration Step 1: Prioritize atoms on C center by mass & 1st diff. MeO | Me-C-H | Me Highest Priority: 1 Lowest Priority: 4 CIP Rules Prioritize by mass Look at 1st point of difference Assign R/S a) Mass of Atom: Cl > Br > I b) * Mass @ 1st pt diff * Total mass of 1st group Step 2: Assign R/S descriptors Find perspective where lowest priority group points away from you. Analyze along 1-2-3 path. 1-2-3 (CW) = S 1-2-3 (CCW) = R Assigning Priority: Isotopes: T > D > H C^13 > C^12 Alkenes/Alkynes: Ghost Carbon: C > H Carbonyl Groups: R-C=N < R-C=O R-C≡N > R-C≡O R-C=NH < R-C=NH₂ R-C≡N > R-C≡NH₂

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