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حرية الوصول المقاله
1 - Synthesis of Tetrahydrobenzo[a]xanthene-11-one Derivatives Using ZrO2–SO3H as Highly Efficient Recyclable Nano-catalyst
Ahmad Nakhaei Sepideh YadegarianThe catalytic effect of Zirconia Sulfuric Acid (ZrSA) nanoparticle which is synthesized from thereaction of ZrO with chlorosulfonic acid has been investigated in the synthesis oftetrahydrobenzo[a]xanthene-11-ones by one-pot three-component reaction of β-naphthol,ar أکثرThe catalytic effect of Zirconia Sulfuric Acid (ZrSA) nanoparticle which is synthesized from thereaction of ZrO with chlorosulfonic acid has been investigated in the synthesis oftetrahydrobenzo[a]xanthene-11-ones by one-pot three-component reaction of β-naphthol,aromatic aldehydes, and dimedone. Different reaction conditions were studied in the presence ofZrSA nanoparticle as catalyst. The results showed that ZrSA exhibited high catalytic activitytowards the synthesis of tetrahydrobenzo[a]xanthene-11-ones, with the desired products beingformed in high yields. Furthermore, the catalyst was recyclable and could be reused at least threetimes without any discernible loss in its catalytic activity. Overall, this new catalytic method forthe synthesis of tetrahydrobenzo[a]xanthene-11-ones provides rapid access to the desiredcompounds under solvent-free conditions at 110 °C following a simple work‐up procedure, andavoids the use of harmful organic solvents. This method therefore represents a significantimprovement over the methods currently available for the synthesis oftetrahydrobenzo[a]xanthene-11-ones. تفاصيل المقالة -
حرية الوصول المقاله
2 - Synthesis of NiFe2O4/sawdust nanocomposite for oil-water separation
Azita Seyed Shariatdoost Mohammad Yousefi pirouz derakhshi Aliakbar Safekordi kambiz larijaniMagnetic nanocomposites have the ability to remove water pollutants such as dyes, oils and organic solvents. In this study, NiFe2O4/sawdust nanocomposite was synthesized for removing oil pollutants. The oil-adsorbing nanocomposite could be easily separated from water by أکثرMagnetic nanocomposites have the ability to remove water pollutants such as dyes, oils and organic solvents. In this study, NiFe2O4/sawdust nanocomposite was synthesized for removing oil pollutants. The oil-adsorbing nanocomposite could be easily separated from water by magnet bar. The XRD results show tetragonal phase proving the composite formation. The FESEM pictures successfully reveal the growth of NiFe2O4 on the sawdust template. The FTIR bands at 422 cm-1 and 615 cm-1correspond to the metal oxygen stretching band. VSM hysteresis loop proves the superparamagnetism of the composite. In addition contact angle depicts hydrophobic properties of the resulted nanocomposite. More importantly, as-prepared nanocomposite exhibited high oil adsorption capacity and good reusability. Our studies show easy synthesis and fast method for oil removal from water. Facile synthesis procedure, high oil adsorption capacity, fast and simple magnetic separation and reusability of nanoadsorbent are among the benefits of these composite. This approach will open up new fields of studies in polluted-water treatment. تفاصيل المقالة -
حرية الوصول المقاله
3 - Synthesis of NiFe2O4/sawdust nanocomposite for oil-water separation
Azita Seyed Shariatdoost Mohammad Yousefi Pirouz Derakhshi Aliakbar Safekordi Kambiz Larijaniorganic solvents. In this study, NiFe2O4/sawdust nanocomposite was synthesized for removingoil pollutants. The oil-adsorbing nanocomposite could be easily separated from water bymagnet bar. The XRD results show tetragonal phase proving the composite formation. TheFESEM أکثرorganic solvents. In this study, NiFe2O4/sawdust nanocomposite was synthesized for removingoil pollutants. The oil-adsorbing nanocomposite could be easily separated from water bymagnet bar. The XRD results show tetragonal phase proving the composite formation. TheFESEM pictures successfully reveal the growth of NiFe2O4 on the sawdust template. The FTIRbands at 422 cm-1 and 615 cm-1correspond to the metal oxygen stretching band. VSM hysteresisloop proves the superparamagnetism of the composite. In addition contact angle depictshydrophobic properties of the resulted nanocomposite. More importantly, as-preparednanocomposite exhibited high oil adsorption capacity and good reusability. Our studies showeasy synthesis and fast method for oil removal from water. Facile synthesis procedure, highoil adsorption capacity, fast and simple magnetic separation and reusability of nanoadsorbentare among the benefits of these composite. This approach will open up new fields of studiesin polluted-water treatment. تفاصيل المقالة -
حرية الوصول المقاله
4 - Fe3O4@SiO2@Am-PPC-SO3H] [HSO4]: A new magnetic solid acid nanocatalyst for the synthesis of benzoxazole derivatives
Mona Sayyahi Maryam Gorjizadeh Soheil SayyahiA novel magnetite nanoparticle-based heterogeneous acidic catalyst [Fe3O4@SiO2@Am-PPC-SO3H] [HSO4] was successfully prepared and characterized by SEM, EDX, TGA, VSM and FT-IR techniques. The magnetically retrievable and sustainable catalyst was investigated in the react أکثرA novel magnetite nanoparticle-based heterogeneous acidic catalyst [Fe3O4@SiO2@Am-PPC-SO3H] [HSO4] was successfully prepared and characterized by SEM, EDX, TGA, VSM and FT-IR techniques. The magnetically retrievable and sustainable catalyst was investigated in the reaction of aldehyde and o-aminophenol for the synthesis of benzoxazoles. The reactions occurred in water and produced the corresponding products in high yields. The catalyst could be readily separated by an external magnet and showed excellent reusability without significant loss of its activity. تفاصيل المقالة -
حرية الوصول المقاله
5 - Acetylation of alcohol, phenols, thiols and amine promoted by succinimidinium hydrogensulfate ([H-Suc]HSO4) in the absence of solvent
Farhad Shirini Omid Goli-Jolodar Mohadeseh SeddighiSuccinimidinium hydrogensulfate ([H-Suc]HSO4), as a new and stable derivative of succinimide, is easily prepared by the reaction of succinimide with neat sulfuric acid. This ionic liquid can be used as an efficient catalyst for the acetylation of alcohols, phenols, thio أکثرSuccinimidinium hydrogensulfate ([H-Suc]HSO4), as a new and stable derivative of succinimide, is easily prepared by the reaction of succinimide with neat sulfuric acid. This ionic liquid can be used as an efficient catalyst for the acetylation of alcohols, phenols, thiols and amines at room temperature under mild and solvent free conditions. All the products are separated and identified using different types of methods including FT-IR, 1H NMR and 13C NMR spectroscopy. This new method consistently has the advantages of chemoselectivity, excellent yields of the products and short reaction times. Further, the catalyst can be reused and recovered for several times without any variations in the yield of the product. تفاصيل المقالة -
حرية الوصول المقاله
6 - Pr3+ doped CoFe2O4: A highly efficient, magnetically recoverable and reusable catalyst for one-pot four-component synthesis of multisubstituted pyrroles
Firoz Kalam Khan Amol Pachpinde Mallinath Langade Kishan Lohar Sunil Patange Omprakash Bhusnure Jaiprakash SangshettiA facile and highly efficient one-pot synthesis of multisubstituted pyrrole derivatives is reported via a four-component reaction of amines, aldehydes, acetylacetone and nitromethane using Pr3+ doped CoFe2O4 as a catalyst in solvent free conditions at 90°C. The cata أکثرA facile and highly efficient one-pot synthesis of multisubstituted pyrrole derivatives is reported via a four-component reaction of amines, aldehydes, acetylacetone and nitromethane using Pr3+ doped CoFe2O4 as a catalyst in solvent free conditions at 90°C. The catalyst is easily recoverable using magnet and could be reused without a significant loss of catalytic activity. Even after five runs for the reaction, the catalytic activity of Pr3+ doped CoFe2O4 was almost the same as that of the freshly used catalyst. The proposed method is advantageous due to its little catalyst loading, short reaction time, catalyst reusability, and excellent yields. تفاصيل المقالة -
حرية الوصول المقاله
7 - An Update on Half-decade Recent Advances in Functionalized Fe3O4 Nanoparticles as Heterogeneous Nanocatalysts for the Synthesis of Six-Membered Compounds Containing Nitrogen: A Mini-Review
Faris Mohammed Aseel M. Aljeboree Nour Abd Alrazzak Ayad F. Alkaim Yasir Karim Sarah A. Hamood Ahmed B. Mahdi Mohammed Abed Jawad Salam AhjelOver the past half-decade, the functionalized Fe3O4 nanoparticles have been applied to organic synthesis as heterogeneous nanocatalysts. Due to the magnetic properties, the functionalized Fe3O4 nanoparticles have been preferred over other catalytic systems. In addition, أکثرOver the past half-decade, the functionalized Fe3O4 nanoparticles have been applied to organic synthesis as heterogeneous nanocatalysts. Due to the magnetic properties, the functionalized Fe3O4 nanoparticles have been preferred over other catalytic systems. In addition, the unique physical, chemical, and magnetic field properties of Fe3O4 nanoparticles have led to the development of them for efficient organic synthesis as heterogeneous catalytic systems. Over the past half-decade, all the researchers tried to design and develop different functionalized Fe3O4 nanoparticles to perform the organic transformation. In this mini-review, different methodologies for the synthesis of six-membered compounds (heterocyclic compounds) containing nitrogen catalyzed by functionalized Fe3O4 nanoparticles have been reviewed. This short review aims to comprehensively investigate the use of functionalized Fe3O4 nanoparticles in the synthesis of six-membered compounds (heterocyclic compounds) containing nitrogen with emphasis on their reusability of the catalysts and magnetic field of them in separation from the organic reaction medium. تفاصيل المقالة -
حرية الوصول المقاله
8 - Catalytic oxidative desulfurization of dibenzothiophene by heterogeneous M2+/Al-layered double hydroxide (M2+ = Zn, Mg, Ni) modified zinc oxide
Nur Ahmad Nova Yuliasari Fitri Arsyad Idha Royani Risfidian Mohadi Aldes LesbaniIn this study, the preparation of layered double hydroxide-metal oxide (ZnAl-ZnO, MgAl-ZnO, and NiAl-ZnO) was successful. The characterization of the catalyst used XRD, FTIR, and SEM analysis. The catalyst shows high oxidative desulfurization of dibenzothiophene. The pe أکثرIn this study, the preparation of layered double hydroxide-metal oxide (ZnAl-ZnO, MgAl-ZnO, and NiAl-ZnO) was successful. The characterization of the catalyst used XRD, FTIR, and SEM analysis. The catalyst shows high oxidative desulfurization of dibenzothiophene. The percentage conversion of dibenzothiophene on ZnAl-ZnO, MgAl-ZnO, and NiAl-ZnO was 99.38%, 99.34%, and 99.90%, respectively. The acidities of ZnAl-ZnO, MgAl-ZnO, and NiAl-ZnO were 0.798, 2.469, and 0.184 mmol/g, respectively. The catalysts are heterogeneous systems, and the advantage is that they can be used for reusability. After 3 cycles of catalytic reactions at 323 K for 30 min, reusability proves that the percentage conversion of dibenzothiophene on ZnAl-ZnO, MgAl-ZnO, and NiAl-ZnO had a stable structure. تفاصيل المقالة -
حرية الوصول المقاله
9 - Preparation and characterization of a dual acidic Ionic Liquid functionalized Graphene Oxide nanosheets as a Heterogeneous Catalyst for the Synthesis of pyrimido[4,5-b] quinolines in water
Mohanad Saleh Ghufran Sadeek Shakir SaiedPyrimido[4,5-b]quinolones play a significant role in medicinal chemistry owing to their various biological properties, including antihistaminic, antimalarial, antifungal, anticancer, antioxidant, antiviral, anti-microbial, and anti-inflammatory activities. A dual acidic أکثرPyrimido[4,5-b]quinolones play a significant role in medicinal chemistry owing to their various biological properties, including antihistaminic, antimalarial, antifungal, anticancer, antioxidant, antiviral, anti-microbial, and anti-inflammatory activities. A dual acidic ionic liquid anchored on graphene oxide nanosheets (GO-Si-Pr-Lysin-SO3H) was provided and characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FT-IR). The six-step process was utilized to create this catalyst, beginning with graphite powder. This catalyst was capable to develop the one-pot and three components (6-amino-1,3-dimethyluracil, dimedone, and different aromatic aldehydes) synthesis of pyrimido[4,5-b]quinolone derivatives at moderate temperature in water as a green medium (12 derivatives). The results obtained indicated that this method could be an effective approach for synthesizing pyrimido[4,5-b]quinolones with high yields ranging from 86% to 98% in a short reaction time of 15 to 40 minutes. In addition, the pointed catalyst shows reusability and recoverability without remarkable loss of catalytic activity. تفاصيل المقالة
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