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1.
Bagheri Maedeh Gholamzadeh Parisa Mohammadi Ziarani Ghodsi Badiei Alireza 《Research on Chemical Intermediates》2019,45(6):3301-3310
Research on Chemical Intermediates - A dual-functional silica-based catalyst was prepared by treating fumed silica with amino-containing silane then 1,4-butane sultone. The presence of functional... 相似文献
2.
Ghodsi Mohammadi Ziarani Alireza Badiei Zeinab Dashtianeh Parisa Gholamzadeh Nina Hosseini Mohtasham 《Research on Chemical Intermediates》2013,39(7):3157-3163
Sulfonic-acid-functionalized silica was applied as an efficient heterogeneous acid catalyst in the Ritter reaction to prepare amides by reaction of various benzylic, allylic, and tertiary alcohols with various nitriles in good to excellent yields under solvent-free conditions. The simplicity of the reaction, recovery of catalyst without loss of reactivity, high yield of products, and short reaction time represent improvements over many existing methods. 相似文献
3.
Seyedeh Yasaman Afsar Ghodsi Mohammadi Ziarani Hoda Mollabagher Parisa Gholamzadeh Alireza Badiei Ali Abolhasani Soorki 《Journal of the Iranian Chemical Society》2017,14(3):577-583
An efficient one-pot synthesis of 2,3-dihydroquinazoline-4(1H)-one derivatives 4a–l is described using SBA-Pr-SO3H as a heterogeneous acid catalyst. The present methodology resulted in various derivatives of 2,3-dihydroquinazoline-4(1H)-one in good yield via a three-component reaction of isatoic anhydride, aldehydes and ammonium acetate. SBA-Pr-SO3H played a significant role as an efficient mesoporous catalyst due to its pore size of 6 nm. Additionally, UV–Vis spectrum of the products was studied in order to investigate their application as UV absorbers. 相似文献
4.
Bizhan Malaekeh-Nikouei Sayyed A. Sajadi Tabassi Golara Gerayeli Mehran Arab Salmani Ali Gholamzadeh 《Journal of inclusion phenomena and macrocyclic chemistry》2012,72(3-4):383-387
The aim of present study was to evaluate the effect of natural, synthetic cyclodextrins (CDs) and CD mixtures on aqueous solubility of beclomethasone dipropionate (BDP). The phase solubility studies were done in the presence of 6 CDs. Furthermore, aqueous solubility of BDP was tested in the presence of CD mixtures. The solubility of BDP in water was increased by 30, 77, 155 and 30 folds in the solution containing 20%?w/v α-CD, hydroxylpropyl β-CD (HP-β-CD), hydroxypropyl γ-CD (HP-γ-CD) and sulphobutylether β-CD (SBE-β-CD), respectively. CD mixtures had remarkable effect on the aqueous solubility of BDP so that solubility in water increased between 200 and 1,500 times in the presence of different CD mixtures. Further addition of sodium acetate to the solubilisation medium reduced the aqueous solubility. In conclusion, CD complexation was able to improve the aqueous solubility of BDP. The synergistic effect of cyclodextrin mixture was observed. 相似文献
5.
Ghodsi Mohammadi Ziarani Parisa Gholamzadeh Alireza Badiei Vaezeh Fathi Vavsari 《Research on Chemical Intermediates》2018,44(1):277-288
Pyruvic acid contains three different reactive positions: –COOH, ketone carbonyl and methyl groups. Correspondingly, pyruvic acid was applied as starting material in the modified Niementowski reaction and Aldol condensation using SBA-Pr-SO3H as an efficient nanocatalyst. Aldol condensation of pyruvic acid and oxindole provided a new oxindol-based carboxylic acid which was subsequently used in the Ugi four-component reaction. Moreover, through the modified Niementowski reaction of pyruvic acid, new derivatives of quiazoline were produced in the presence of SBA-Pr-SO3H. The obtained products are important due to their potentially biological active skeletons. 相似文献
6.
An efficient method was developed for the protection of alcohols as trityl ethers using triphenylmethanol in the presence of nanoporous MCM-41-SO3H as a heterogeneous catalyst under solvent-free ball-milling at room temperature. Low catalyst loading, high efficiency, reusability are among the advantages of this new solvent-free and environmentally friendly method. The deprotection of the produced trityl ethers was also efficiently achieved using the same catalyst in wet acetonitrile. 相似文献
7.
M. Mirzaii S. Seyyedi M. Sadeghi Z. Gholamzadeh 《Journal of Radioanalytical and Nuclear Chemistry》2010,284(2):333-339
natCd electrodeposition on a copper substrate was investigated for production of 111In radionuclide. The electrodeposition experiments were carried out by alkaline plating baths. Operating parameters such as
pH, temperature, and current density are also optimized. The current efficiency was measured at different current densities.
The optimum conditions of the cadmium electrodeposition were as follows: 2.35 g L−1 cadmium, pH = 13, DC current density of ca 4.27 mA cm−2 at 25 °C temperature with 62.48 μm thickness. SEM photomicrographs demonstrated fine-grained structure of the deposit obtained
from the optimum bath. 相似文献
8.
Mohammadi Ziarani Ghodsi Moradi Razieh Ahmadi Tahereh Gholamzadeh Parisa 《Molecular diversity》2019,23(4):1029-1064
Molecular Diversity - 4-Hydroxycoumarins are some of the most versatile heterocyclic scaffolds and are frequently applied in the synthesis of various organic compounds. 4-Hydroxycoumarin-based... 相似文献
9.
Bizhan Malaekeh-Nikouei Sayyed A. Sajadi Tabassi Hossein Ashari Ali Gholamzadeh 《Journal of inclusion phenomena and macrocyclic chemistry》2009,65(3-4):335-340
In this study, the effect of different CDs including α-CD, β-CD, γ-CD, hydroxypropyl β-CD (HP β-CD), sulphobutylether β-CD (SBE β-CD) and HP γ-CD on aqueous solubility of fluorometholone (Flu) was investigated. Also the phase solubility studies were performed in the presence of eye drop excipients such as benzalkonium chloride, hydroxypropyl methylcellulose (HPMC) and buffers. The aqueous solubility of Flu was increased by 8, 15, 5, 100, 65 and 135 folds in the presence of 20% w/v α-CD, β-CD, γ-CD, HP β-CD, HP γ-CD and SBE β-CD, respectively. Aqueous solubility of Flu was 0.43 ± 0.08 and 1.16 ± 0.04 mg/mL in systems containing 5% w/v HP γ-CD and SBE β-CD, respectively. The aqueous solubility of Flu in the presence of HP γ-CD was not influenced by buffer type while the phosphate buffer caused a reduction in the aqueous solubility in the presence of SBE-β-CD. Also, investigations on the solubility of Flu in water in the presence of 5% HP γ-CD and SBE-β-CD and the additives such as benzalkonium chloride and HPMC indicated that these components had no remarkable effect on the aqueous solubility of Flu. In conclusion, CD complexation is able to improve the aqueous solubility of Flu and it would be possible to prepare ophthalmic solution of Flu by this method. 相似文献
10.
Gallium-68 (T
1/2 = 68 min, I
β+ = 89%) is an important positron-emitting radionuclide for positron emission tomography and used in nuclear medicine for diagnosing
tumours. This study gives a suitable reaction to produce 68Ga. Gallium-68 excitation function via 68Zn(p, n)68Ga, 68Zn(d, 2n)68Ga, 70Zn(p, 3n)68Ga and 65Cu(α, n)68Ga reactions were calculated by ALICE-91 and TALYS-1.0 codes. The calculated excitation function of 68Zn(p, n)68Ga reaction was compared with the reported measurement and evaluations. Requisite thickness of the targets was obtained by
SRIM code for each reaction. The 68Ga production yield was evaluated using excitation function and stopping power.
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