Magnetic Piperazine-Functionalized Reduced Graphene Oxide as a Heterogeneous Catalyst in the Pechmann Coumarin Synthesis

Carbon nanomaterials have been ideal candidates for metal-free catalysts due to their inexpensiveness, easy availability, environmental friendliness and unique surface properties. Among them, the modified graphene oxide having a two-dimensional structure and prominent features has attracted a lot of attention(1). Chemical reduction of graphene oxide (rGO) is performed using hydrazine hydrate, which is also guided by the removal of oxygen and the recycling of two-way aromatic carbon and also has chemical active sites that make it noticeable as an active substance in molecular sensors (2) .Coumarins play an important role in the natural products and organic synthesis To date, there are several methods for the synthesis of coumarines have been reported in the literature .Pechmann reaction is one of the best methods which include the condensation of phenols with β-ketoesters in the presence of various catalysts (3). In this work, the piperazine-functionalized reduced graphene oxide was initially synthesized, magnetized with Fe3O4, and was then used as a heterogeneouc catalyst in the Pechmann coumarin synthesis under solvent-free conditions. Also, effects of the various reaction parameters, including temperature, reaction time, mol% catalyst were studied. The yield results showed that the above magnetic catalyst efficienty catalyzed the Pechmann reaction

کلیدواژه ها:

Heterogeneous Catalyst ، Reduced Graphene Oxide ، Pechmann Reaction ، Coumarins