Catalysis Letters, Vol.149, No.10, 2864-2872, 2019
Design and Synthesis of Novel Cage like CuFe2O4 Hollow Nanostructure as an Efficient Catalyst for Synthesis of 4,4 '-(aryl methylene)bis(3-methyl-1H-pyrazol-5-ol)s
Cage like CuFe2O4 hollow nanostructure has been synthesized successfully using hard template method under the hydrothermal condition. Cu(NO3)(2)6H(2)O, Fe(NO3)(2)9H(2)O and glucose were dissolved in water, and the mixture was heated to 180 degrees C in an autoclave. The removal of carbon was achieved by calcination at 800 degrees C and finally, the cage like CuFe2O4 hollow structure was obtained. This cage like CuFe2O4 hollow structure was characterized by FE-SEM, EDS, TEM and XRD. The catalytic performance of this hollow nanostructure was evaluated for the synthesis of bis pyrazol-5-ols. To this end, the one pot condensation reactions of phenylhydrazine, ethyl acetoacetate and different aromatic aldehyde at 80 degrees C under the solvent free condition were performed. The optimum amount of applied catalyst for this transformation was obtained to be 0.04mol%. Noteworthy, catalyst was easily recoverable and was reused for 7 times with the remaining of its initial structure as well as its catalytic activity.
Keywords:Hollow nanostructure;CuFe2O4;Heterogeneous catalyst;One pot reaction;Bis pyrazole derivatives