排序方式: 共有153条查询结果,搜索用时 15 毫秒
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Ojaghi Aghbash Khadijeh Noroozi Pesyan Nader Marandi Ghasem Dege Necmi Şahin Ertan 《Research on Chemical Intermediates》2019,45(9):4543-4554
Research on Chemical Intermediates - A safe, green and convenient process was developed for the synthesis of a novel group of 4,8-dihydropyrano[3,2-b]-pyrans by dialkyl acetylenedicarboxylates and... 相似文献
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Ghasem Karim-Nezhad Zeynab Khorablou Parisa S. Dorraji 《Journal of the Iranian Chemical Society》2018,15(4):905-913
In this paper, a novel and convenient electrochemical sensor for detection of methimazole (MMI) by differential pulse voltammetry is presented. This sensor was fabricated by dripping well-dispersed MWCNTs onto glassy carbon electrode (GCE) surface, and then poly-l-Arg (P-L-Arg) film was deposited on the electrode. Finally, Cu nanoparticles (CuNPs) were electrochemically deposited on the resulting film by using cyclic voltammetry to prepare CuNPs-P-L-Arg/MWCNTs/GCE. The surface morphology of the electrodes has been studied by scanning electron microscopy. Studies reveal that the irreversible oxidation of MMI was highly facile on CuNPs-P-L-Arg/MWCNTs/GCE. The dynamic detection range of this sensor to MMI was 5.2–50 µM, with the detection limit of 2 µM. A new voltammetric method for determination of MMI was erected and shows good sensitivity and selectivity, very easy surface update and good stability. The analytical application of the modified electrode is demonstrated by determining MMI in biological fluids (serum). 相似文献
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Saboury AA Bagheri S Ataie G Amanlou M Moosavi-Movahedi AA Hakimelahi GH Cristalli G Namaki S 《Chemical & pharmaceutical bulletin》2004,52(10):1179-1182
Thermodynamic studies were carried out to evaluate the binding of theophylline on adenosine deaminase (ADA) in 50 mM sodium phosphate buffer pH 7.5, at 300 K, using isothermal titration calorimetry (ITC). A simple method for determination of binding isotherm in the drug--ADA interaction was applied using ITC data. ADA has two binding sites for theophylline, which show positive cooperativity in its sites. The intrinsic association equilibrium constants are 6 and 52 mM(-1) in the first and second binding sites, respectively. Hence, occupation of the first site has produced an appreciable enhancement by 8.7 of the binding affinity of the second site. The molar enthalpies of binding are -12.2 and -14.9 kJ/mol in the first and second binding sites, respectively. 相似文献
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The paper studies the existence of infinitely many solutions for a Neumann problem involving the p(x)-Laplacian-like depending on two parameters. Our approach is based on variational methods. 相似文献
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Ghasem Marandi Niloufar Akbarzadeh Torbati Reza Heydari Nourallah Hazeri Sayyed Mostafa Habibi-Khorassani Malek Taher Maghsoodlou 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):1450-1461
A series of diverse NH- and CH-acids are used for a one-pot synthesis of stable phosphorus ylides and 1,4-diionic organophosphorus compounds by trapping of the zwitterionic intermediate from the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates under solvent-free conditions. The structural geometry for one of the products was confirmed by single crystal X-ray diffraction analysis. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. 相似文献
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Efficient and rapid oxidation of Hantzsch 1,4-dihydropyridine with tetrabutylammonium peroxomonosulfate (TBAO) is reported. The Mn(salophen)/monopersulfate catalytic system efficiently converts 1,4-dihydropyridines (DHPs) to their corresponding pyridine derivatives under mechanical stirring and microwave irradiation in CH2Cl2. The ability of various Schiff base complexes to oxidize DHPs was also investigated. The results showed that in the presence of manganese Schiff complex, no by-product was obtained. 相似文献
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Ghasem Aghapour Ameneh Asgharzadeh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6):796-802
AbstractA simple, highly selective and efficient method is described for the conversion of primary alcohols, tetrahydropyranyl and silyl ethers to thiocyanates by use of chlorodiphenylphosphine and ammonium thiocyanate. Secondary substrates produce both the two isomeric products, thiocyanate and isothiocyanate, while tertiary ones give isothiocyanates as the only products by this new method. In contrast to previously reported methods based on trivalent phosphorus for this transformation, the present method does not require an electrophile in the presence of trivalent phosphorus (ClPPh2). The order of activity of these substrates is silyl ether> alcohol > tetrahydropyranyl ether. The present method not only interestingly distinguishes between primary, secondary and tertiary substrates but also converts them to the corresponding thiocyanates with excellent chemoselectivity in the presence of several other functional groups. 相似文献
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Ghasem Marandi Malek T. Maghsoodlou Nourallah Hazeri Sayyed M. Habibi-Khorassani Niloufar Akbarzadeh Torbati Faramarz Rostami-Charati Brian W. Skelton Mohamed Makha 《Molecular diversity》2011,15(1):197-201