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α-Fe_2O_3 nanoparticles:An efficient,inexpensive catalyst for the one-pot preparation of 3,4-dihydropyrano[c]chromenes 被引量:2
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作者 H.Nagabhushana S.Sandeep Saundalkar +5 位作者 L.Muralidhar B.M.Nagabhushana C.R.Girija D.Nagaraja M.A.Pasha V.P.Jayashankara 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第2期143-146,共4页
This paper describes the combustion synthesis ofα-Fe2O3 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 na... This paper describes the combustion synthesis ofα-Fe2O3 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-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. 展开更多
关键词 α-Fe2O3 nanopowder One pot three-component condensation Aromatic aldehyde Malanonitrile 4-Hydroxycoumarin
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Novel and Efficient One Pot Condensation Reactions between Ketones and Aromatic Alcohols in the Presence of CrO3 Producing α,β-Unsaturated Carbonyl Compounds
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作者 李亚男 陈道勇 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2011年第10期2086-2090,共5页
We report a new, effective and simple method for preparing a,fl-unsaturated carbonyl compounds by reacting ketones and aromatic alcohols at 56 ℃ in the presence of CrO3 (CrO3 acts as an oxidant and also a catalyst)... We report a new, effective and simple method for preparing a,fl-unsaturated carbonyl compounds by reacting ketones and aromatic alcohols at 56 ℃ in the presence of CrO3 (CrO3 acts as an oxidant and also a catalyst) for around 10 h. The condensation reactions occurred effectively among a wide combination of ketones and alcohols. The procedure is simple and the yields can be high up to 98%. And a probable mechanism is proposed. 展开更多
关键词 one pot condensation reaction KETONE ALCOHOL CRO3 α β-unsaturated carbonyl compound
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