Article | REF: AF3641 V1

Crystallization and polymorphism - Physico-chemistry of polymorphism

Author: Michel BAUER

Publication date: April 10, 2004

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4. Molecules containing asymmetric carbons

When a molecule contains asymmetric carbons, there are several situations to consider. For simplicity's sake, let's take the case of a molecule containing a single asymmetric carbon. The product may be either the pure enantiomers R or S, or a racemate corresponding to a 50/50 mixture of the enantiomers.

The racemic product itself can give rise, as a general rule, to two different situations:

  • the first case corresponds to the conglomerate, an equimolecular mixture of the two crystalline enantiomers R and S ;

  • the second case corresponds to the true racemate, which is characterized by a unitary crystal lattice in which the two enantiomers coexist;

  • the third case corresponds to the so-called pseudoracemate in the case of a 50/50 mixture. This term designates...

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Molecules containing asymmetric carbons