Fig. 1: Photochemical reactivity of iminium ions.
From: Triplet state reactivity of iminium ions in organocatalytic asymmetric [2 + 2] photocycloadditions
a, Reported types of reactivity in iminium ion-mediated catalysis. b, Leveraging the triplet excited state reactivity of iminium ions (IV) for the development of organocatalytic enantioselective [2 + 2] dearomative photocycloadditions. SET, single electron transfer. ISC, intersystem crossing.
