Effect of Reaction Media on Photosensitized [2+2]‐Cycloaddition of Cinnamates

The Cover Feature shows that [2+2]‐Cycloadditions of cinnamates are efficiently carried out both in solution and in gel media using Ir‐based photocatalyst under visible light irradiation. The reaction media governs the stabilization of the biradical key intermediate, thus slowing down the ring closure step and facilitating the equilibration towards the sterically most favorable all‐ trans  cyclobutanes. The use of gelled solvents allows performing the reaction under aerobic conditions. More information can be found in the Full Paper by Alex Abramov et al.