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An efficient synthesis of pyrazole chalcones under solvent free conditions at room temperature

Chinese Chemical Letters 2011年第1期22卷 37-40页

作者： Parvin Kumar Sunil Kumar Khalid Husain Ashwani Kumar Chemistry Department Guru Nanak Khalsa CollegeHaryana 135001India Chemistry Department Government CollegeHaryana 125001India Drug Discovery and Research Laboratory Department of Pharmaceutical SciencesGuru Jambheshwar University of Science & TechnologyHaryana 125001India

An easy, safe, solvent free and effective method for the synthesis of pyrazole-substituted chalcones has been achieved by grinding pyrazole aldehydes and acetophenones in the presence of activated barium hydroxide （C-200） in high yield within short span of time. All reactions were carried out just by grinding the two reactants in the presence of activated barium hydroxide （C-200）. Results are also compared with sodium hydroxide and potassium hydroxide.

关键词： Pyrazole aldehydes Chalcones Activated barium hydroxide (C-200) solvent free conditions

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Wet carbon-based solid acid/NaNO_3 as a mild and efficient reagent for nitration of aromatic compound under solvent free conditions

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Chinese Chemical Letters 2007年第9期18卷 1064-1066页

作者： Arash Shokrolahi Abbas Zali Mohammad Hossein Keshavarz Chemistry Department Malek-ashtar University of TechnologyShahin-shahrP.O.Box 83145-115Iran

Nitro aromatic compound can be obtained in high yields via nitration of aromatic compound with wet carbon-based solid acid and NaNO_3 under solvent free oxidation at room temperature.

关键词： Carbon-based solid acid Sodium nitrate Nitration solvent free conditions

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Nano-Fe3O4 as a New Reusable Catalyst for the Selective Acetylation of Alcohols and Phenols under solvent free conditions

Nano-Fe3O4 as a New Reusable Catalyst for the Selective Acet...

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International Conference on Chemistry and Chemical Engineering （ICCCE 2011）

作者： Mohamad Zaman Kassaee Monireh Ghavami Department of Chemistry University of Tarbiat Modares P.O. Box 14155-4838 Tehran Iran

Our aim in this work was to find an efficient and selective method for protection of alcohols and phenols through acetylation. We carried out all our reactions in the presents of CaCl2 co-catalyst and acetic anhydride, and under solvent free conditions at room temperature. Under such conditions, we compared and contrasted two brands of our heterogonous catalysts including arc discharge fabricated magnetic Fe3O4 nanoparticles （AD-MNPs）, and those prepared by the co-precipitation （CP-MNPs） with average particle sizes of about 53 and 28 nm, respectively. The latter was prepared using aqueous NaOH solution as the precipitating agent for FeCl3·6H2O and FeSO4.7H2O. High selectivity was observed for acetylation of phenols carrying electron withdrawing groups. Also 100% yield was observed using benzyl alcohol. The AD- MNPs was reused three times without any significant loss of its catalytic activity. The efficiency of AD- MNPs was twice that of CP-MNPs.

关键词： Fe3O4 nanoparticles Acetylation Heterogeneous catalyst solvent free conditions Protection

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