فهرست مطالب

Iranian Journal of Catalysis
Volume:4 Issue: 2, Spring 2014

  • تاریخ انتشار: 1393/04/22
  • تعداد عناوین: 9
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  • Bahareh Sadeghi, Maryam Ghorbani Rad Pages 67-70
    Reaction between aromatic aldehydes and 3–methyl-1-phenyl-2-pyrazoline-5-one catalyzed by nano-SiO2/HClO4 in water under reflux provided a simple and efficient route for the synthesis of 4-((5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)(aryl)methyl)-3-methyl-1-phenyl-1H-pyrazol-5-ol derivatives in high yields.
    Keywords: Nano, SiO2, HClO4, Aromatic aldehydes, 3–Methyl, 1, phenyl, 2, pyrazoline, 5, one, Water
  • Ziba Tavakoli, Elnaz Ghasemi, Issa Yavari Pages 71-75
    Ionic liquids such as 1,3-dialkylimidazolium salts make excellent catalysts and solvents for synthesis of dialkyl 2-(dialkoxyphosphoryl)-3-(1-oxo-1-H-phthalazin-2-yl)succinates from 2H-phthalazin-1-one, dialkyl acetylenedicarboxylates, and trialkyl phosphites. Under similar conditions, triphenyl phosphite led to dialkyl 2-(diphenoxyphosphoryl)-3-(1-oxo-1-H-phthalazin-2-yl)succinates. The ionic liquid was readily recycled and can be reused four times without significant loss of activity or mass.
    Keywords: Phosphorylation, Organocatalysis, 2H, Phthalazin, 1, one, Acetylenic ester, Ionic liquid
  • Mohammad Khodadadi-Moghaddam Pages 77-83
    Photocatalytic reduction of carbon dioxide to formaldehyde was investigated on four semiconductor photocatalysts (FeS, FeS/FeS2, NiO and TiO2). The reaction was carried out in continues flow of CO2 gas bubbled into the reactor. Semiconductor photocatalysts were characterized by X-Ray diffraction (XRD) and Diffuse Reflectance Spectroscopic (DRS) methods. Sulfide ion was used as hole scavenger. The results show that the TiO2 has greater photocatalytic activity compared to the other photocatalysts, for example, maximum formaldehyde concentration were 720 and 380 ppm on TiO2 and NiO, respectively. Addition of carbonate ion causes an increase (around two times) in the concentration of formaldehyde. The yield of the formaldehyde decreased with decreasing concentration of the sulfide ion and the pH of the reaction mixture (from 700 ppm to 500 ppm). This investigation demonstrates that under ultraviolet radiation, carbon dioxide can be reduced to formaldehyde on semiconductor photocatalysts. This reaction could have been a possible chemical route to photosynthesis on the early Earth.
    Keywords: Carbon dioxide, Photocatalyst, Reduction, Origin of Life
  • Leila Youseftabar-Miri*, Fatemeh Akbari, Farshid Ghraghsahar Pages 85-89
    Eggshell was found to be a versatile heterogeneous catalyst for the synthesis of pyrano[3,2-c]quinoline derivatives in good yields. This protocol has the advantages of environmental friendliness, short reaction time, low cost and convenient operation.
    Keywords: Multicomponent reactions, Pyranoquinoline, Eggshell, Heterogeneous catalyst
  • Hossein Naeimi, Zahra Sadat Nazifi Pages 91-97
    Efficient and one-pot synthesis of 1,8-dioxo-octahydroxanthenes was described by Knoevenagel condensation, Michael addition and cyclodehydration of dimedone. This reaction was carried out through condensation of dimedone and various aromatic aldehydes in the presence of task-specific Brønsted acidic ionic liquid under solvent free conditions. The catalyst could be recycled five times without significant loss of its catalytic activity.
    Keywords: Dimedone, Aromatic aldehydes, 1, 8‐Dioxooctahydroxanthenes, Ionic liquid, Catalyst
  • Elham Davoodi, Leila Youseftabar-Miri, Hamideh Hosseinjani-Pirdehi Pages 99-104
    An efficient and direct procedure for the synthesis of benzo[h]-indeno[1,2-b]-quinoline derivatives has been described. The procedure employs a three-component condensation reaction in one-pot using 2H-indene-1, 3-dione, naphthalen-1-amine,and aldehydes in the presence of catalytic amount of L-prolinein aqueous media.
    Keywords: Quinoline derivatives, Aqueous media, Multicomponent reactions, L, proline
  • Kobra Nikoofar Pages 105-111
    Ammonium monovanadate (NH4VO3) has been devoted as an efficient, commercially available, eco-friendly and reusable catalyst for the synthesis of bis(indolyl)methanes (BIMs), oxindole derivatives and also Michael adducts of indoles at 50 °C under solvent-free conditions. The reusability of this solid acid catalyst in addition with its selectivity has also been examined.
    Keywords: Indole, Isatin, α β, Unsaturated compounds, Alkylation, Ammonium monovanadate
  • Seyyedeh Cobra Azimi Pages 113-120
    Cellulose sulfuric acid was used as an efficient biopolymer-based catalyst for the synthesis of tetrahydropyrimido[4,5-b]quinoline-2,4,6-triones and hexahydro-2H-pyrazolo[5,4-b]quinoline-6-ones via three component reaction of aldehyde, 5,5-dimethyl-1,3-cyclohexadione and 6-amino-1,3-dimethyluracil or 5-amino-3-methyl-1-phenypyrazole under solvent-free conditions at 90 oC. The major advantages of the present method are simple experimentation, use of inexpensive and eco-friendly reusable catalyst with good yields and short reaction times.
    Keywords: 6, Amino, 1, 3, dimethyluracil, 5, Amino, 3, methyl, 1, phenypyrazole, Solvent, free, Cellulose sulfuric acid
  • Mohadeseh Seddighi Pages 121-123
    Mohaddeseh Seddighi was born in Rasht, Guilan, I. R. Iran (1985). She received B.Sc. in applied chemistry from Isfahan University of Technology (IUT) (2007) and his M.Sc. in organic chemistry from Isfahan University of Technology (2010) under the direction of Professor Abdol. R. Hajipour. She began her Ph.D. studies at University of Guilan under supervision of Professor Farhad Shirini from 2011. Her current researches focus on the development of new catalysts and synthetic methodologies.