Intramolecular [2+2] photocycloaddition of 3- and 4-(but-3-enyl)oxyquinolones: influence of the alkene substitution pattern, photophysical studies, and enantioselective catalysis by a chiral sensitizer.

Intramolecular [2+2] photocycloaddition of 3- and 4-(but-3-enyl)oxyquinolones: influence of the alkene substitution pattern, photophysical studies, and enantioselective catalysis by a chiral sensitizer.