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Citation: H. Nagabhushana, S. Sandeep Saundalkar, L. Muralidhar, B. M. Nagabhushana, C. R. Girija, D. Nagaraja, M. A. Pasha, V. P. Jayashankara. α-Fe₂O₃ nanoparticles:An efficient, inexpensive catalyst for the one-pot preparation of 3,4-dihydropyrano[c] chromenes[J]. Chinese Chemical Letters, ;2011, 22(2): 143-146. doi: 10.1016/j.cclet.2010.09.020 shu

α-Fe₂O₃ nanoparticles:An efficient, inexpensive catalyst for the one-pot preparation of 3,4-dihydropyrano[c] chromenes

a Department of PG Studies in Physics and Research, University Science College, Tumkur University, Tumkur 572103, India;
b Department of Chemistry, SSMRV College, Chemistry Research Center, Bangalore 560041, India;
c Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560054, India;
d Department of PG Studies in Chemistry and Research, University Science College, Tumkur University, Tumkur 572103, India;
e Department of Chemistry, Central College Campus, Bangalore University, Bangalore 560001, India

Received Date: 16 April 2010

Fund Project: The authors thank Dr. S.C. Sharma, Vice chancellor, Tumkur University, Tumkur for his constant encouragement. The authors thank VTU (VTU/Aca./2009-10/A-9/11714) for the financial support and Chemistry-TEQIP Laboratory of MSRIT and SSMRV College, Chemistry Research Center.

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.
- α-Fe₂O₃ nanopowder,
- One pot three-component condensation,
- Aromatic aldehyde,
- Malanonitrile,
- 4-Hydroxycoumarin
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