Combustion Derived Nanocrystalline-ZrO2 and Its Catalytic Activity for Biginelli Condensation under Microwave Irradiation  

作　　者：Bhojegowd, Madhusudana Reddy M. Siddaramanna, Ashoka Siddappa, Anandakumar B. Thimmanna, Chandrappa G. Pasha, Mohamed A. 

机构地区：[1]Department of Studies in Chemistry, Central College Campus, Bangalore University, Bengaluru-560001, India

出　　处：《Chinese Journal of Chemistry》2011年第9期1863-1868,共6页中国化学（英文版）

摘　　要：Nanocrystalline zirconium（IV） oxide （nc-ZrO2） possessing high surface area was synthesized by a low tem- perature eco-friendly solution combustion method using a new organic fuel alanine. The powder XRD, SEM and surface area measurements were carried out for characterization of nc-ZrO2. The powder XRD results revealed that, the nc-ZrO2 has the pure tetragonal phase. The crystallite size calculated by Scherrer＇s formula and BET surface area were found to be ca. 53--57 nm and ca. 275 m2/g, respectively. SEM micrograph exhibited the macroporous nature of the powder, nc-ZrO2 has been employed as a catalyst for the solvent-free synthesis of 3,4-dihydro- pyrimidin-2-ones （DHPMs） by a microwave （MW） assisted one-pot, multicomponent Biginelli condensation reaction of araldehydes, ethylacetoacetate and urea or thiourea. DHPMs are obtained in good to excellent yields （85%-- 96%） under this reaction condition within short interval of time （10--20 min）.Nanocrystalline zirconium（IV） oxide （nc-ZrO2） possessing high surface area was synthesized by a low tem- perature eco-friendly solution combustion method using a new organic fuel alanine. The powder XRD, SEM and surface area measurements were carried out for characterization of nc-ZrO2. The powder XRD results revealed that, the nc-ZrO2 has the pure tetragonal phase. The crystallite size calculated by Scherrer＇s formula and BET surface area were found to be ca. 53--57 nm and ca. 275 m2/g, respectively. SEM micrograph exhibited the macroporous nature of the powder, nc-ZrO2 has been employed as a catalyst for the solvent-free synthesis of 3,4-dihydro- pyrimidin-2-ones （DHPMs） by a microwave （MW） assisted one-pot, multicomponent Biginelli condensation reaction of araldehydes, ethylacetoacetate and urea or thiourea. DHPMs are obtained in good to excellent yields （85%-- 96%） under this reaction condition within short interval of time （10--20 min）.

关 键 词：nanocrystalline-ZrO2 solution combustion araldehydes ethylaceto acetate nano materials GREENCHEMISTRY catalysis 3 4-dihydropyrimidinones 

分 类 号：O645.13[理学—物理化学] TE665.3[理学—化学]