“…To overcome the recyclability of catalysts and environmental issues, the reactions were performed by biodegradable catalysis 31 and heterogeneous catalysis using clay, 32 ZnO, 33 Cu–ZnO, 34 CaO, 35 N-doped TiO 2 , 36 V 2 O 5 /ZrO 2 , 37 Fe 3 O 4 38 or CuO/rGO. 39 The comparative features of organic transformations with respect to catalytic conditions are given in Table 1.…”