(R)-1-Fluoroethylamine (C₂H₆FN) - R or S Configuration
Is (R)-1-Fluoroethylamine R or S?
(R)-1-Fluoroethylamine (C₂H₆FN) has 1 chiral center. Tests F vs N priority - the most common CIP error on exams. Students memorize "N is high priority" but fluorine (Z=9) beats nitrogen (Z=7).. The configuration is R based on CIP priority rules.
| Formula | C₂H₆FN |
| Name | (R)-1-Fluoroethylamine |
| Number of Chiral Centers | 1 |
| Configuration(s) | R |
| Difficulty | Advanced |
Chiral Center Analysis
(R)-1-Fluoroethylamine (C₂H₆FN) contains 1 chiral center. Tests F vs N priority - the most common CIP error on exams. Students memorize "N is high priority" but fluorine (Z=9) beats nitrogen (Z=7).. Each chiral center is analyzed below using CIP (Cahn-Ingold-Prelog) priority rules to determine R or S configuration.
CIP Priority Assignment
The four substituents on the chiral center are ranked by atomic number of the directly attached atom, with ties broken by exploring outward along each branch.
- Priority 1: F - Fluorine (Z=9) - highest atomic number directly bonded
- Priority 2: -NH₂ - Nitrogen (Z=7) - high but LOWER than fluorine (Z=9)
- Priority 3: -CH₃ - Carbon (Z=6) - lowest atomic number among non-H substituents
- Priority 4: H - Hydrogen (Z=1) - always lowest
R/S Configuration
With the lowest priority group (priority 4) oriented away from the viewer, the remaining three substituents trace a clockwise path from priority 1 to 2 to 3. This gives the R configuration.
Interactive stereochemistry explorer with guided walkthroughs and practice quizzes.
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