Diastereospecific is a term used in chemistry to describe a reaction or a process that exhibits selectivity toward the formation of one or more specific diastereoisomers. Diastereoisomers are stereoisomers that are not mirror images of each other, and they have different spatial arrangements at one or more chiral centers. In contrast to enantioselectivity, which involves the preference for one enantiomer over its mirror image, diastereospecificity involves the preference for one diastereomer over another.