排序方式: 共有124条查询结果,搜索用时 15 毫秒
61.
Mohammad H. Habibi Shahram Tangestaninejad Valiollah Mirkhani Bahram Yadollahi 《Monatshefte für Chemie / Chemical Monthly》2002,133(3):323-327
Summary. Alcohols and phenols are converted to esters in a mild, clean, and efficient reaction with acetic anhydride in the presence
of a catalytic amount of potassium dodecatungstocobaltate trihydrate (K5CoW12O40 · 3H2O).
Received August 27, 2001. Accepted (revised) October 29, 2001 相似文献
62.
Maryam Moosavifar Shahram Tangestaninejad Majid Moghadam Valiollah Mirkhani Iraj Mohammadpoor-Baltork 《Comptes Rendus Chimie》2011,14(10):953-956
In the present work, a mild and efficient method has been developed for the synthesis of acylals from aldehydes with acetic anhydride in the presence of molybdophosphoric acid encapsulated into dealuminated zeolite Y (MPA-DAZY) as a catalyst under solvent-free conditions at 45–55 °C in good to excellent yield. The deprotection of acylals has also been attained using this catalyst in acetonitrile. The catalyst was reused several times without efficient loss of its catalytic activity. 相似文献
63.
Valiollah Mirkhani Reza Kia Dalibor Milić Akbar Rostami Vartooni Dubravka Matković-Čalogović 《Transition Metal Chemistry》2010,35(1):81-87
Four new Re(I) tricarbonyl-diimine complexes were prepared by reaction of Re(CO)5Cl with N,N′-bis(substituted benzylidene)ethane-1,2-diamine Schiff base ligands. These compounds were characterized by physico-chemical
methods, and their crystal structures were established by X-ray diffraction. The coordination geometry at the Re atom is that
of a distorted octahedron, with three carbonyl ligands in the facial geometry. 相似文献
64.
Beheshteh Asadi Amir Landarani-Isfahani Iraj Mohammadpoor-Baltork Shahram Tangestaninejad Majid Moghadam Valiollah Mirkhani Hadi Amiri Rudbari 《Tetrahedron letters》2017,58(1):71-74
Fe3O4-TDSN-Bi(III) was utilized as an efficient and reusable catalyst for the regioselective one-pot synthesis of quinoline derivatives from arylamines, arylaldehydes and methyl propiolate under microwave irradiation and solvent-free conditions. Also, bis-quinolines were obtained in high yields from dialdehydes or diamines. Atom-economy, high to excellent yields, easy work-up, as well as simple catalyst recovery and reusability are the key features of this procedure. 相似文献
65.
A new protocol has been developed for the efficient synthesis of structurally diverse N-cyclohexyl-2-(2,4-dioxo-2,3,4,5-tetrahydro-1H-benzo[b][1,5]diazepin-3-yl)-2-phenylacetamides through a one-pot, five-component condensation reaction of an aromatic diamine, an aromatic aldehyde, an isocyanide, ethyl malonyl chloride, and water in dichloromethane with good yields, at ambient temperature, in the presence of MgCl2 as a catalyst. 相似文献
66.
Sulfonated palladium(II) N‐heterocyclic carbene complex immobilized on nano–micro size poly(4‐vinylpyridinium chloride) for Suzuki‐Miyaura cross‐coupling reaction
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Zari Pahlevanneshan Majid Moghadam Valiollah Mirkhani Shahram Tangestaninejad Iraj Mohammadpoor‐Baltork Saghar Rezaei 《应用有机金属化学》2015,29(10):678-682
The sulfonated palladium(II) N‐heterocyclic carbene complex PdII(NHC)SO3?, supported on poly(4‐vinylpyridinium chloride), was used as a heterogeneous, recyclable and active catalyst for the Suzuki–Miyaura reaction. This catalyst was applied for coupling of various aryl halides with phenylboronic acid and the corresponding products were obtained in excellent yields and short reaction times. The catalyst was characterized using Fourier transform infrared and diffuse reflectance UV–visible spectroscopies, scanning electron microscopy and elemental analysis. After each reaction, the catalyst was recovered easily by simple filtration and reused several times without significant loss of its catalytic activity. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
67.
Immobilization of palladium(II)‐containing bis(imidazolium) ligand on ion‐exchange resins: efficient and reusable catalysts for CC coupling reactions
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Zari Pahlevanneshan Majid Moghadam Valiollah Mirkhani Shahram Tangestaninejad Iraj Mohammadpoor‐Baltork Ahmad R. Khosropour 《应用有机金属化学》2015,29(6):346-352
Suzuki reactions catalysed by a palladium(II) complex of a functionalized bis(imidazolium) ligand, PdII(BIM), immobilized on Dowex 50 WX8 and Amberlite IR‐120 ion‐exchange resins as heterogeneous, recyclable and active catalysts are reported. The catalysts, PdII(BIM)@Amberlite IR‐120 and PdII(BIM)@Dowex 50 WX8, were characterized using Fourier transform infrared and diffuse‐reflectance UV–visible spectroscopies and scanning electron microscopy. These heterogeneous catalysts are oxygen‐insensitive and air‐ and moisture‐stable in C? C coupling reactions, and are reusable several times without significant loss of their catalytic activity. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
68.
V. Mirkhani M. Moghadam S. Tangestaninejad S. Hajibagheri 《Journal of the Iranian Chemical Society》2010,7(3):641-645
The catalytic activity of Mn(III)salophen complex supported on polystyrene-bound imidazole, [Mn(salophen)Cl-PSI], was studied in the oxidation of primary aromatic amines in acetonitrile/water, using sodium periodate as an oxygen source. Amines were oxidized efficiently to their corresponding azo derivatives in the presence of this catalyst. The heterogeneous catalyst showed high stability and reusability in the oxidation reactions and could be reused several times without loss of its activity. The effect of different solvents was studied in the oxidation of p-toluidine and CH3CN/H2O was chosen as the solvent. 相似文献
69.
Majid Moghadam Shahram Tangestaninejad Valiollah Mirkhani Naghmeh Sadat Mirbagheri 《Journal of organometallic chemistry》2010,695(17):2014-1368
In the present work, highly efficient epoxidation of alkenes catalyzed by Mo(CO)6 supported on amines modified multi-wall carbon nanotubes, MWCNTs, is reported. The prepared catalysts were characterized by elemental analysis, scanning electron microscopy, FT-IR and diffuse reflectance UV-Vis spectroscopic methods. These new heterogenized catalysts, [Mo(CO)6@amines-MWCNT], were used as highly efficient catalysts for epoxidation of alkenes with tert-BuOOH. These robust catalysts could be reused several times without loss of their catalytic activities. 相似文献
70.
Arsalan Mirjafari Majid Moghadam Shahram Tangestaninejad Valiollah Mirkhani Ahmad Reza Khosropour 《Tetrahedron letters》2010,51(25):3274-728
The Lewis acid room temperature ionic liquid, [bmim][InCl4], was found to be an efficient and green catalyst for the highly chemoselective and one-pot conversion of MOM- or EOM-ethers into their corresponding nitriles, bromides, and iodides under microwave irradiation. The procedures are simple, rapid, and high yielding. The catalyst exhibited a remarkable reactivity and is reusable. 相似文献