论文部分内容阅读
This paper describes the combustion synthesis ofα-Fe_2O_3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano[c]chromenes.The combustion derivedα-Fe_2O_3 nanopowder was characterized by powder X-ray diffraction(PXRD),Braunauer,Emmett and Teller(BET) surface area,scanning electron microscopy(SEM) and Fourier transform infrared spectroscopy(FTIR).Highly efficient,three-component condensation of aromatic aldehyde,malanonitrile and 4- hydroxycoumarin catalyzed byα-Fe_2O_3 nanoparticles at room temperature is described.The method offers an excellent alternative to the synthesis of 3,4-dihydropyrano[c]chromenes.The reactions are rapid,clean,and the products with good yield and high purity.
This paper describes the combustion synthesis of α-Fe 2 O 3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano [c] chromenes. The combustion derived α-Fe 2 O 3 nanopowder was characterized by powder X-ray diffraction PXRD), Braunauer, Emmett and Teller (BET) surface area, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) .Highly efficient, three-component condensation of aromatic aldehyde, malanonitrile and 4-hydroxycoumarin catalyzed by α-Fe_2O_3 nanoparticles at room temperature is described. The method offers an excellent alternative to the synthesis of 3,4-dihydropyrano [c] chromenes. These reactions are rapid, clean, and the products with good yield and high purity.