(redirected from Racemisation)
Also found in: Dictionary, Medical.
Related to Racemisation: Racemic mixture, Mutarotation, racemized


(organic chemistry)
A process by which an optically active form of a substance is converted into a racemic mixture.



the formation of an optically inactive product (racemate) as a result of a reaction involving an asymmetric atom. Racemization is caused by the appearance of an intermediate compound (or transition state), not itself possessing an asymmetric atom, which has an equal probability of yielding optical antipodes. The antipodes, in turn, form racemic compounds. The racemization of carboxylic acids, for example, involves enolization:

Racemization occurs in reactions leading to the formation of the flat carbonium ion and in reactions that are carried out through free radicals.

References in periodicals archive ?
Direct dating of the bones by Amino Acid Racemisation (AAR) or the AMS radiocarbon technique (Clarke 1999; Field & White, unpublished results) have been unsuccessful and electron spin resonance (ESR) studies are pending.
The application of the amino acid racemisation geochronological technique to Late Pleistocene fossil teeth from the Australian megafaunal locality, Cuddie Springs.