(R)-Limonene vs (S)-Limonene - Isomer Relationship
What is the relationship between (R)-Limonene and (S)-Limonene?
Mirror-image terpenes with dramatically different smells. (R)-Limonene smells like oranges; (S)-Limonene smells like lemons.
| Molecule A | (R)-Limonene (C₁₀H₁₆) |
| Molecule B | (S)-Limonene (C₁₀H₁₆) |
| Relationship Type | enantiomers |
| Difficulty | advanced |
Introduction
Your nose can tell these enantiomers apart! One smells like oranges, the other like lemons. Same atoms, same bonds — just a mirror-image difference.
Formula Comparison
Both have the formula C₁₀H₁₆ and the same connectivity: a cyclohexene ring with a methyl group and an isopropenyl substituent.
Connectivity Analysis
The bonding sequence is identical. A six-membered ring with one C=C double bond, a methyl group at C1, and an isopropenyl group (–C(=CH₂)CH₃) at C4.
Spatial Relationship
The isopropenyl group at C4 can point above or below the ring plane. In (R)-limonene it points one way; in (S)-limonene it points the opposite way. They are non-superimposable mirror images.
Chirality Check
C4 is the chiral center — it bears four different groups: the isopropenyl group, hydrogen, and two different ring segments. The R/S designation reflects opposite configurations.
Classification
These are enantiomers. Despite identical physical properties (boiling point, density, solubility), biological receptors in your nose distinguish them — demonstrating the biological importance of chirality.
Side-by-side 3D comparison with sync rotation, difference highlighting, and guided classification.
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Stereochemistry Explorer
Assign R/S configuration to chiral centers with CIP priority rules
Drug Chirality
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