stéréoisomère

Traductions

• anglais

  Date : 1983

  Définition

  Either of two isometric compounds whose only difference is the three-dimensional arrangement of their constituent atoms or groups relative to one another.
  
  Stereoisomers: compounds of identical atomic and molecular structure but different spatial arrangement.

  Note :

  Such pairs of compounds may be either geometric (cis-trans) isomers or optical (D.L) isomers. Among the former are a number of metal coordination complexes, especially of cobalt, where the metal acts as a ligand. In the case of asymmetric (mirror-image) compounds, the enantiomorphs formed can be stereoisomers. The four-carbon sugars, for example, have two pairs of enantiomorphs (D and L configurations); in such instances, the two D and the two L forms which are not enantiomorphs are called diastereoisomers. Stereoisomers occur widely in natural products, particularly among the carotenoids, some of which have over 100; for example, beta-carotene has 20.

  Terme :

  1. stereoisomer