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Chinese Chemical Letters 2015年第5期26卷 575-579页

作者： Farid Moeinpour amir khojastehnezhad Department of Chemistry Bandar Abbas BranchIslamic Azad University Young Researchers and Elite Club Mashhad BranchIslamic Azad University

Cesium carbonate supported on hydroxyapatite coated ***2O4 magnetic nanoparticles （***2O4@Hap-Cs2CO3） was found to be magnetically separable, highly efficient, green and recyclable heterogeneous catalyst. The synthesized nanocatalyst has been characterized with several methods （FT-IR, SEM, TEM, XRD and XRF） and these analyzes confirmed which the cesium carbonate is well supported to catalyst surface. After full characterization, its catalytic activity was investigated in the synthesis of pyranopyrazole derivatives and the reactions were carried out at room temperature in 50：50 water/ethanol with excellent yields （88-95%）. More importantly, the ***204@Hap-Cs2CO3 was easily separated from the reaction mixture by external magnetic field and efficiently reused at least six runs without any loss of its catalytic activity. Thus, the developed nanomagnetic base catalyst is potentially useful for the green and economic production of organic compounds.

关键词： Cesium carbonate Catalysis Pyranopyrazoles Magnetic nanoparticles Hydroxyapatite

PPA-SiO_2 catalyzed efficient synthesis of polyhydroquinoline derivatives through Hantzsch multicomponent condensation under solvent-free conditions

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Chinese Chemical Letters 2011年第7期22卷 807-810页

作者： amir khojastehnezhad Farid Moeinpour Abolghasem Davoodnia Department of Chemistry Faculty of SciencesIslamic Azad UniversityMashhad BranchMashhad 91735-413Iran Department of Chemistry Faculty of SciencesIslamic Azad UniversityBandar Abbas BranchIran

Silica gel-supported polyphosphoric acid （PPA-SiO2） was found to be an efficient catalyst for the one-pot four-component Hantzsch condensation reaction of aryl aldehydes, dimedone, ethyl acetoacetate and ammonium acetate to afford the corresponding polyhydroquinoline derivatives in high yields. The main advantages of the present approach are short reaction times, clean reaction profiles, simple experimental and workup procedures.

关键词： Multicomponent reaction One-pot synthesis Solvent-free Polyhydroquinoline derivatives Silica-supported polyphosphoric acid (PPA-SiO2)

SO3H-Functionalized Ionic Liquids： Green, Efficient and Reusable Catalysts for the Facile Dehydration of Aldoximes into Nitriles

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Chinese Journal of Chemistry 2011年第5期29卷 978-982页

作者： Davoodnia Abolghasem khojastehnezhad amir Bakavoli Mehdi Tavakoli-Hoseini Niloofar Department of Chemistry Faculty of Sciences Mashhad Branch Islamic Azad University Mashhad Iran

Easily synthesized aldoximes have been converted to the corresponding nitriles under very mild conditions by a simple reaction using two halogen-free SO3H-functionalized ionic liquids, 3-methyl-l-（4-sulfonic acid）butylimidazolium hydrogen sulfate [MIM（CH2）aSO3H][HSO4] and 1-（4-sulfonic acid）butylpyridinium hydrogen sulfate [PY（CH2）4SO3H][HSO4], as catalyst and reaction medium without any additional organic solvent. The method was equally effective for aromatic aldoximes bearing electron-donating and electron-withdrawing substituents. Taking into account environmental and economical consideration, the protocol presented here has the merits of environmentally friendly, simple operation, easy work-up and very good yields. The catalysts could be recycled and reused for several times without noticeably decreasing in their catalytic activities.

关键词： ionic liquid aldoxime nitrile dehydration

Silica Gel-Supported Polyphosphoric Acid （PPA/SiO2）： An Efficient and Reusable Heterogeneous Catalyst for Facile Synthesis of 14-Aryl-14H-dibenzo[aj]xanthenes under Solvent-free Conditions

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Chinese Journal of Chemistry 2011年第2期29卷 297-302页

作者： khojastehnezhad amir Davoodnia Abolghasem Bakavoli Mehdi Tavakoli-Hoseini Niloofar Zeinali-Dastmalbaf Mohsen Department of Chemistry Faculty of Sciences Islamic Azad University Mashhad Branch Mashhad Iran

A simple, efficient and green method for the synthesis of 14-aryl-14H-dibenzo[aj]xanthenes by a one-pot condensation reaction of β-naphthol and aryl aldehydes using silica gel-supported polyphosphoric acid （PPA/SiO2）, an effective and reusable catalyst, under solvent-free conditions is described. The present methodology offers several advantages, such as a simple procedure with an easy work-up, short reaction times, high yields, and the absence of any volatile and hazardous organic solvents.

关键词： 14-Aryl-14H-dibenzo[a,j]xanthenes PPA/SiO2 heterogeneous catalysis green chemistry solvent-flee conditions

绿色可磁性分离二氧化硅包裹镍铁尖晶石负载硫酸氢铁纳米粒子催化剂用于合成1,8-二氧十氢吖啶合成(英文)

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催化学报 2014年第3期35卷 376-382页

作者： amir khojastehnezhad Mohammad Rahimizadeh Hossein Eshghi Farid Moeinpour Mehdi Bakavoli Department of Chemistry Faculty of Sciences Ferdowsi University of Mashhad Mashhad Iran Department of Chemistry Islamic Azad University-Bandar Abbas Branch Bandar Abbas *** Iran

A new magnetically separable catalyst consisting of ferric hydrogen sulfate supported on silica-coated nickel ferrite nanoparticles was *** synthesized catalyst was characterized using vibrating sample magnetometry,X-ray diffraction,transmission electron microscopy,scanning electron microscopy,and Fourier transform infrared *** new magnetic catalyst was shown to be an efficient heterogeneous catalyst for the synthesis of 1,8- dioxodecahydroacridines under solvent-free *** catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activity.

关键词：催化剂包镍铁氧体硫酸氢磁性分离纳米粒子二氧化硅合成铁素体

二氧化硅包覆NiFe_2O_4担载Preyssler杂多酸用于合成双(二氢嘧啶酮)苯和3,4-二氢嘧啶-2(1H)-酮（英文）

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催化学报 2015年第3期36卷 299-307页

作者： Hossein Eshghi Ali Javid amir khojastehnezhad Farid Moeinpour Fatemeh F. Bamoharram Mehdi Bakavoli Masoud Mirzaei Department of Chemistry Faculty of Sciences Ferdowsi University of Mashhad Mashhad Iran Department of Chemistry Ahvaz Branch Islamic Azad University Ahvaz Iran Department of Chemistry Bandar Abbas Branch Islamic Azad University Bandar Abbas *** Iran Department of Chemistry College of Science Mashhad Branch Islamic Azad University Mashhad Iran

A novel magnetic acidic catalyst comprising Preyssler(H14[Na P5W30O110]) heteropoly acid support‐ed on silica coated nickel ferrite nanoparticles (Ni Fe2O4@Si O2) was *** catalyst was characterized by Fourier transform infrared,scanning electron microscopy,transmission electron microscopy,X‐ray diffraction,energy dispersive spectrum,VSM and particle size *** catalytic activity was investigated for the synthesis of bis(dihydropyrimidinone)benzene and 3,4‐dihydropyrimidin‐2(1H)‐ones derivatives by the Biginelli *** the catalyst,the reac‐tions occurred in less than 1 h with good to excellent *** importantly,the catalyst was easily separated from the reaction mixture by an external magnet and reused at least five times without degradation in the activity.

关键词：二氢嘧啶酮催化合成纳米颗粒镍铁二氧化硅扫描电子显微镜透射电子显微镜反应混合物