The main methods (For reviews: Feringa et al. 1998 DOI Inoue 1992 DOI) are:
* photodestruction, the conversion of one enantiomer leading to the enrichment of the other enantiomer. Also called asymmetric photolysis.
* Photoresolution, a deracemization process of photochemically interconvertable enantiomers.
* Asymmetric photosynthesis, an enantioselective photochemical formation of an optically active compound from a prochiral substrate. Also called absolute asymmetric synthesis.
* Asymmetric photosensitization with an optically active compound