What is chirality in chemistry?

Chirality is a geometric property where a molecule or ion cannot be superposed onto its mirror image by any combination of rotations, translations, or conformational changes. Derived from the Greek word for hand, chiral molecules typically exist as a pair of non-superposable mirror-image stereoisomers called enantiomers. This property plays a crucial role in biochemistry and pharmacology, as biological systems often interact with only one specific enantiomer of a compound.

What we know

• A molecule or ion is chiral if it cannot be superposed on its mirror image by rotations, translations, and certain conformational changes. [2]
• The most common source of chirality in organic compounds is a stereogenic center, such as a carbon atom bound to four distinct groups. [2]
• Enantiomers share identical physical and chemical properties except for their optical activities and how they react with other chiral compounds. [2]
• In living organisms, biological building blocks like carbohydrates and almost all amino acids occur as only one specific enantiomer. [2, 5]

Where to go next

• a case in pointWhat are enantiomers?
• how it workedHow does axial chirality work without a chiral center?
• the bigger pictureHow does stereochemistry classify different molecular isomers?
• whoWho first coined the term chirality?
• compared withHow do racemic mixtures differ from pure enantiomers?
• an unexpected connectionWhy do pharmaceuticals have different potencies based on handedness?Living organisms typically metabolize only one enantiomer of a chiral compound, causing the medical potencies or effects of drug enantiomers to differ sharply.

Sources

• [1]chirality (Wikidata Q214514) · CC0 1.0
• [2]Chirality (chemistry) · CC BY-SA 4.0
• [3]Chirality · CC BY-SA 4.0
• [4]Axial chirality · CC BY-SA 4.0
• [5]Enantiomer · CC BY-SA 4.0