(R,R)-Tartaric Acid vs meso-Tartaric Acid - Isomer Relationship
What is the relationship between (R,R)-Tartaric Acid and meso-Tartaric Acid?
(R,R)-Tartaric acid is chiral (optically active). meso-Tartaric acid has stereocenters but is achiral due to an internal mirror plane.
| Molecule A | (R,R)-Tartaric Acid (C₄H₆O₆) |
| Molecule B | meso-Tartaric Acid (C₄H₆O₆) |
| Relationship Type | meso compounds |
| Difficulty | beginner |
Introduction
Both molecules have two chiral centers. But one is optically active and the other is not. Why?
Formula Comparison
Both have the formula C₄H₆O₆ with identical connectivity: HOOC–CHOH–CHOH–COOH.
Connectivity Analysis
The bonding sequence is identical. Both have two chiral centers (C2 and C3), each bearing H, OH, COOH, and CHOH(COOH).
Spatial Relationship
In (R,R)-tartaric acid, both centers have the same configuration. In meso-tartaric acid, one center is R and the other is S.
Chirality Check
The meso form has an internal mirror plane between C2 and C3 — the top half mirrors the bottom half. This makes it achiral despite having stereocenters. (R,R)-tartaric acid has no internal mirror plane and is chiral.
Classification
This pair demonstrates the meso concept: a molecule with stereocenters that is nonetheless achiral due to internal symmetry. The (R,R) form and the meso form are diastereomers of each other.
Side-by-side 3D comparison with sync rotation, difference highlighting, and guided classification.
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Stereochemistry Explorer
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