Cover Feature: Photocatalytic Oxidative [2+2] Cycloelimination Reactions with Flavinium Salts: Mechanistic Study and Influence of the Catalyst Structure (3/2021)

The Cover Feature shows the photocatalytic oxidative cycloelimination of a coumarin dimer by a flavinium salt inspired by the light-induced photolyase DNA repair reaction in nature. Light absorption and subsequent intersystem crossing (isc) enable diffusion-controlled electron transfer (eT) from the coumarin dimer to the excited triplet flavinium salt. The oxidized coumarin dimer dissociates and back electron transfer (beT) completes the photocatalytic cycle. More information can be found in the Full Paper by R. Cibulka, R. Kutta, and co-workers.