Stereochemistry

Chirality

A property of a molecule that makes it non-superimposable on its mirror image.

Achiral

An object that is identical to its mirror image.

Enantiomer

Stereoisomers that are non-superposable mirror images of each other.

Diastereomer

Stereoisomers whose molecules are not mirror images of each other.

Stereoisomer

Isomers that have the same connectivity of atoms but differ in their spatial arrangement.

Constitutional Isomer

Isomers that have the same molecular formula but different connectivity.

Optical Activity

The ability of chiral substances to rotate the plane of polarized light.

Racemic Mixture

An equimolar mixture of two enantiomers that results in no net rotation of plane-polarized light.

Chirality Center

A carbon atom bonded to four different groups, making the molecule chiral.

Specific Rotation

The observed rotation of plane-polarized light corrected for the temperature and concentration.

What is stereochemistry?

Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior.

What are the two main types of stereoisomers?

The two main types of stereoisomers are enantiomers and diastereomers.

What distinguishes enantiomers from diastereomers?

Enantiomers are non-superposable mirror images, while diastereomers are not mirror images of each other.

What is an example of a chiral molecule?

An example of a chiral molecule is 2-butanol, which has two enantiomers due to its chirality.

How does chirality affect drug activity?

Chirality can significantly affect how drugs interact with biological systems; often, only one enantiomer is therapeutically active.

What is the significance of the R/S nomenclature?

The R/S nomenclature designates the absolute configuration of chiral centers in molecules.

What tools are used to determine optical activity?

Polarimetry is used to measure the optical activity of chiral compounds.

What is a resolution in the context of stereochemistry?

Resolution refers to the process of separating racemic mixtures into their individual enantiomers.

What does a racemic mixture consist of?

A racemic mixture consists of equal amounts of both enantiomers of a chiral compound.

Why is optical purity important in pharmaceuticals?

Optical purity is important because the biological activity of drugs often depends on the specific enantiomer present.