A lot of efforts have been made for the development of novel organic photoredox catalysts (PCs) due to their gratifying replacement for conventional transition metal-based PCs in photoredox catalysis. In this minireview, we summarized and classified the recently reported organic PCs into several categories based on functional groups (e.g. cyanoarene, phenazine, xanthene, and others) with their applications to various organic transformations including polymerization reactions. The strate-[a]

A facile approach with random copolymers composed of two epoxide monomers bearing different acetal groups realizes the tunable kinetics of micelle degradation.

The Cover Feature shows the representative scaffold structures of the recently emerged organic photoredox catalysts (PCs), which have been reported since 2016. The expanded library of organic PCs along with their design strategies, properties, and applications in organic syntheses were summarized. Now given the feasibility to discover the molecules with the diversified structures and predictable and/or adjustable catalytic parameters, it is expected to examine the puzzle of organic photoredox catalysis: answer the fundamental questions remain unresolved and design a better catalytic system. More information can be found in the Minireview by Y. Lee and M. S. Kwon.