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Organic Chemistry

Stereochemistry and Chirality

Learn Stereochemistry and Chirality in Organic Chemistry from the production AIPH study guide.

Study guide topics

Structure and Bonding in Organic MoleculesFunctional Groups and NomenclatureTypes of Organic ReactionsStereochemistry and ChiralityReaction MechanismsSpectroscopy and Organic AnalysisOrganic Chemistry in MedicineOrganic Chemistry in Everyday LifeEnvironmental Impact of Organic CompoundsMastering Reaction TypesVisualizing Structures

Advanced Topics

In a nutshell: Stereochemistry studies the 3D arrangement of atoms, crucial in pharmaceuticals and biology.

## Looking at Molecules in 3D Not all molecules with the same formula are identical—some are mirror images! This is the world of stereochemistry. ### Chirality A molecule is chiral if it cannot be superimposed on its mirror image (like your hands). Chirality is crucial in nature and medicine. ### Enantiomers - **Enantiomers** are pairs of chiral molecules that are mirror images. - Their properties may be identical in most ways, but they often interact with living systems differently. ### Why Stereochemistry Matters Many drugs work only if they have the correct 3D shape. One enantiomer might be a helpful medicine, while its mirror image could be ineffective or even harmful.

Examples

  • The two enantiomers of limonene smell like oranges and lemons, respectively.
  • Thalidomide's different enantiomers led to very different effects in patients.

Key terms

Chirality
A property where an object is not superimposable on its mirror image.
Enantiomer
One of a pair of molecules that are mirror images of each other.
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