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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Molybdenum catalyst,Superparamagnetic nanoparticle,Dendrimer,Epoxidation of alkene,Reusable catalyst
- چکیده:
- چکیده انگلیسی: The new heterogeneous catalyst based on MoO2(acac)2 immobilized on superparamagnetic nanoparticle functionalized with dendrimer was synthesized. The dendrimer with amine and sulfur functional groups offer proper positions for a strong connection between MoO2(acac)2 and support. The synthesized catalyst was characterized by FT-IR spectroscopy, ICP, TGA, SEM, TEM, and XRD. This catalyst showed high activity in the epoxidation of alkene with tert-BuOOH. These reactions displayed the best performance in the present of 1,2-dichloroethan as a solvent and 0.0108 mmol of the catalyst. The use of magnetic nanoparticles (MNPs) as support facilitates the separation of the catalyst from the reaction media by simple magnetic decantation. Eventually, the catalyst can be recovered and reused without a decrease in its catalytic activity and significant Mo leaching for five times.
- انتشار مقاله: 10-03-1399
- نویسندگان: Mohammad Ahmadi,Mehrnaz Bahadori,Valiollah Mirkhani,Majid Moghadam,Shahram Tangestaninejad,Iraj Mohammadpoor-Baltork
- مشاهده
- جایگاه : پژوهشی
- مجله: Nanochemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: EDTA,PD,Magnetite nanoparticles,Buchwald-Hartwig reaction
- چکیده:
- چکیده انگلیسی: During thelast20-30 years, palladium-catalyzed reactions have witnessed tremendous advances in the industrial and organic reactions such as hydrogenation, coupling, cyanation and amination. Despite the wide utility of Pd-catalysts in these reactions, they suffer from a number of drawbacks such as recovery, reuse of catalyst and remain as a contaminant in the products at the end of the reaction.
A powerful and convenient reaction procedure for the C-N coupling reaction (the Buchwld-Hartwig reaction), yielding products of N-arylanilines and N-arylamines in conventional heating has been reported. The protocol utilized an high stable Pd(EDTA)2- salt by counter cation of N-methylimidazolium bounded to 1,3,5-triazine-tethered SPIONs (superparamagnetic iron oxide nanoparticles). The reaction products were produced under conventional heating at extremely low catalyst loading (as low as 0.003 mol% Pd).Finally, we also examined the reusability of the catalyst. It was found that the catalyst could be recovered by external magnetic field and be reused for five times without obvious loss in catalytic activity.- انتشار مقاله: 23-04-1396
- نویسندگان: Marzieh Ghotbinejad,Ahmad Reza Khosropour,Iraj Mohammadpoor-Baltork,Majid Moghadam,Valiollah Mirkhani,Shahram Tangestaninejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Nanochemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Palladium nanoparticles,Magnetic nanoparticles,Heck reaction,Hyperbranched polymers,Sonogashira coupling reaction,Suzuki–Miyaura cross-couplings reaction
- چکیده:
- چکیده انگلیسی: This study offers an exclusive class of magnetic nanoparticles supported hyperbranched polyglycerol (MNP/HPG) that was functionalized with citric acid (MNP/HPG-CA) as a host immobilization of palladium nanoparticles. The MNP/HPG-CA/Pd catalyst was fully characterized using some different techniques such as thermogravimetric analysis (TGA), x-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), inductively coupled plasma (ICP) and x-ray photoelectron spectroscopy (XPS). The new catalytic system showed high activity for the Suzuki–Miyaura cross-coupling and Heck reaction under mild and green conditions. Besides, the MNP/HPG-CA/Pd was found to be a convenient catalyst for copper-free Sonogashira coupling reaction in water as a green solvent at room temperature. Moreover, the catalyst could be recovered easily and reused several times without significant loss of reactivity. Ease of preparation, oxygen insensitive, phosphine-free, air- and moisture-stable, and high reusability of this immobilized palladium catalyst are the noteworthy advantages of this catalytic system.
- انتشار مقاله: 31-05-1394
- نویسندگان: Mina Amini,Marzieh Hajjari,Amir Landarani-Isfahani,Valiollah Mirkhani,Majid Moghadam,Sharam Tangestaninejad,Iraj Mohammadpoor-Baltork,Mohammad Ahmadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Nanochemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Palladium,Magnetite nanoparticles,Buchwald-Hartwig reaction,N-Heterocyclic carbenes,TCT
- چکیده:
- چکیده انگلیسی: A powerful and convenient reaction procedure for the C-N coupling reaction (the Buchwald-Hartwig reaction), yielding products of N-arylanilines and N-arylamines in both conventional heating and microwave irradiation has been reported. The protocol utilizes a stable and new supper ferromagnetic nanoparticle chelating N-heterocyclic dicarbene palladium(II) complex (Pd-NHC) as catalyst which helps/allows us to complete the reaction with only 0.002 mol% Pd producing high yield products. We also examined the reusability of the catalyst. It was found that the catalyst could be recovered by external magnetic field and reused for seven times without obvious loss in catalytic activity.
- انتشار مقاله: 12-02-1394
- نویسندگان: Marzieh Ghotbinejad,Ahmad R. Khosropour,Iraj Mohammadpoor-Baltork,Majid Moghadam,Shahram Tangestaninejad,Valiollah Mirkhani
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Molybdenum catalyst,Superparamagnetic nanoparticle,Dendrimer,Epoxidation of alkene,Reusable catalyst
- چکیده:
- چکیده انگلیسی: The new heterogeneous catalyst based on MoO2(acac)2 immobilized on superparamagnetic nanoparticle functionalized with dendrimer was synthesized. The dendrimer with amine and sulfur functional groups offer proper positions for a strong connection between MoO2(acac)2 and support. The synthesized catalyst was characterized by FT-IR spectroscopy, ICP, TGA, SEM, TEM, and XRD. This catalyst showed high activity in the epoxidation of alkene with tert-BuOOH. These reactions displayed the best performance in the present of 1,2-dichloroethan as a solvent and 0.0108 mmol of the catalyst. The use of magnetic nanoparticles (MNPs) as support facilitates the separation of the catalyst from the reaction media by simple magnetic decantation. Eventually, the catalyst can be recovered and reused without a decrease in its catalytic activity and significant Mo leaching for five times.
- انتشار مقاله: 10-03-1399
- نویسندگان: Mohammad Ahmadi,Mehrnaz Bahadori,Valiollah Mirkhani,Majid Moghadam,Shahram Tangestaninejad,Iraj Mohammadpoor-Baltork
- مشاهده