Chiral catalysts are molecules that possess chirality and are capable of transferring this chirality to the reaction products. They often contain metal centers coordinated to chiral ligands, which create a chiral environment around the metal center. This chiral environment allows the catalyst to differentiate between the two enantiomers of a substrate, leading to the preferential formation of one enantiomer over the other. Examples include chiral phosphine ligands and chiral oxazoline ligands.