Crystalline nanobelts of a-MoO 3 have been obtained successfully using novel and safe agents through a simple and safe sol-gel method (polymerizing-complexing) and characterized by XRD, FT-IR, Raman spectroscopies, high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and the temperature programmed desorption (TPD) of ammonia. An orthorhombic lattice system for nano-MoO 3 was established. The HRTEM images showed that the nanobelt morphology of a-MoO 3 mostly ranged from 20-70 nm in width and 200-400 nm in length. The ammonia TPD profile demonstrated strong acidic sites. The spectral and analysis data confirmed the effectiveness of the method for the preparation of a-MoO 3 nanobelts by prevention of grain growth or agglomeration of the particles. The nanostructured MoO 3 exhibited a high efficiency in catalyzing the condensation reaction of various 1,2-diamine and carbonyl compounds for synthesis of heterocyclic compounds. The recovery of the title heterogenous nanocatalyst was easy and efficient and its catalytic activity was strikingly different from the bulk material.
The reaction of 2-oxo-2 H-chromene-3-carbonitriles with dialkyl acetylenedicarboxylates and pyridines results in a three-component condensation reaction in which the 2-oxo-2 H-chromene-3-carbonitrile group acts as a dipolarophile to produce benzopyrano[3,4- a] quinolizines under mild conditions in good yield.
Reusable α-MoO 3 Nanobelts Catalyzes the Green and Heterogeneous Condensation of 1,2-Diamines with Carbonyl Compounds. -α-MoO3 nanobelts are prepared and successfully applied as a catalyst for synthesis of quinoxalines and indoles from diamines. -(JAFARPOUR*, M.; REZAEIFARD, A.; GHAHRAMANINEZHAD, M.; TABIBI, T.; New J. Chem. 37 (2013) 7, 2087-2095, http://dx.doi.org/10.1039/c3nj00058c ; Catal. Res. Lab., Dep. Chem., Fac. Sci., Univ. Birjand, Birjand 97179, Iran; Eng.) -R. Staver 47-167
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