Synthesis of Fused Dihydroazepine Derivatives of Fullerenes by a Rh‐Catalyzed Cascade Process

AbstractA synthetic methodology is reported that functionalizes C60 and C70 fullerenes with dihydroazepine rings by a cascade reaction encompassing a rhodium‐catalyzed cycloisomerization of 1,5‐bisallenes and a [4+2] cycloaddition. This transition metal‐catalyzed cascade reaction provides a versatile and step‐economical approach to the synthesis of 6,7‐membered polyheterocyclic fullerene adducts. Electrochemical characterization of the products obtained ventures their application in organic and perovskite photovoltaic devices.magnified image