【摘 要】
：
This paper describes the combustion synthesis of α-Fe2O3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dih
【机 构】
：
Department of PG Studies in Physics and Research,Department of Chemistry,Department of PG Studies in
论文部分内容阅读
This paper describes the combustion synthesis of α-Fe2O3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano [c]chromenes. The combustion derived α-Fe2O3 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-Fe2O3 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.
其他文献
Coarse-grained molecular dynamics simulations were carried out to investigate the dewetting behavior of a polymer thin film on partial wetting solid surface at
The promoting effect of ethanol on the synthesis of N-(2-methylphenyl)hydroxylamine from o-nitrotoluene in Zn/H2O/CO2 system was observed. By adding appropriate
The threshold control of safety blasting vibration velocity is a significant process for the underground mining of complicated ore deposit under construction, r
A 3-D numerical formulation is proposed on the horizontal Cartesian, vertical sigma-coordinate grid for modeling non-hydrostatic pressure free-surface flows. Th
Abstract Kineroatic properties of coronal mass ejections(CMEs)suffer from projection effects，and it is expected that the real velocity should be larger and the r
The polyoxometalate(POM)-imidazole ionic liquid(IL) [C8mim]2[Mo6O19](C8mim=1-methyl-3-octylimidazolium) with a low melting point of 82.6 ℃ was successfully pre
Phosphorus is an important limiting nutrient in many ecosystems. Consequently, there is increasing interest on phosphate uptake and algal growth due to the incr
Regularity criteria of Leray-Hopf weak solutions to the three-dimensional Navier-Stokes equations in some critical spaces such as Lorentz space, Morrey space an
作者讨论一般提交向后的一种类型有它的随机的微分方程(FBSDE )? s 随机作为前面的方程推迟了方程并且作为向后的方程期望了向后的随机的微分方程。一般 FBSDE 的存在和唯一
This article proves that the random dynamical system generated by a two- dimensional incompressible non-Newtonian fluid with multiplicative noise has a global r