排序方式: 共有60条查询结果,搜索用时 15 毫秒
11.
12.
Iraj Mohammadpoor-Baltork Ahmad R. Khosropour Majid Moghadam Shahram Tangestaninejad Valiollah Mirkhani Saeid Baghersad Arsalan Mirjafari 《Comptes Rendus Chimie》2011,14(10):944-952
An efficient and novel synthesis of 2,3-disubstituted 2,3-dihydroquinazolin-4(1H)-ones via one-pot, three-component reaction of isatoic anhydride, primary amines and aromatic aldehydes catalyzed by Bi(NO3)3·5H2O under solvent-free conditions is described. Oxidation of these 2,3-dihydroquinazolin-4(1H)-ones to their quinazolin-4(3H)-ones was also successfully performed in the presence of Bi(NO3)3·5H2O. This new method has the advantages of convenient manipulation, short reaction times, excellent yields, very easy work-up, and the use of commercially available, low cost and relatively non-toxic catalyst. The role of Bi(NO3)3·5H2O was also investigated in these transformations. 相似文献
13.
Iraj Mohammadpoor-Baltork Majid Moghadam Shahram Tangestaninejad Valiollah Mirkhani Ahmad Reza Khosropour Arsalan Mirjafari 《Monatshefte für Chemie / Chemical Monthly》2010,14(1):1083-1088
Abstract
1-Methylimidazolium hydrogensulfate, [Hmim][HSO4], a Br?nsted acidic room temperature ionic liquid, is used as a catalyst and reaction medium for facile and eco-friendly deprotection of methoxymethyl (MOM) and ethoxymethyl (EOM) ethers to their corresponding alcohols under thermal conditions (Δ) and microwave irradiation (MW). Furthermore, one-pot interconversion to the respective acetates and trimethylsilyl (TMS) ethers was also achieved. 相似文献14.
Iraj Mohammadpoor-Baltork Majid Moghadam Shahram Tangestaninejad Valiolah Mirkhani Arsalan Mirjafari 《Comptes Rendus Chimie》2010,13(12):1468-1473
In the present work, the catalytic activity of 12-tungstophosphoric acid immobilized on [bmim][FeCl4] ionic liquid as a highly efficient and eco-friendly catalytic system for rapid and chemoselective direct conversion of MOM- or EOM-ethers into their corresponding nitriles, bromides and iodides under microwave irradiation is reported. In these reactions, the products are obtained in high yields. The catalyst exhibited remarkable reactivity and was reused several times. 相似文献
15.
Arsalan Wares 《International Journal of Mathematical Education in Science & Technology》2013,44(3):351-358
The purpose of this article is to provide examples of ‘non-traditional’ theorems that can be explored in a dynamic geometry environment by university and high school students. These theorems were encountered in the dynamic geometry environment. The author believes that teachers can ask their students to construct proofs for these theorems. The Appendix contains proof outlines for each theorem. 相似文献
16.
Askari Azam Entezari Amir Arsalan Pordel Mehdi Beigoli Sima Nezafat Yazdi Zeinab Jahani Moghaddam Arya Chamani Jamshidkhan 《Journal of the Iranian Chemical Society》2020,17(1):135-149
Journal of the Iranian Chemical Society - Evaluating the binding interaction between biomacromolecules and various chemical compounds is one of the most biologically researched topics. The present... 相似文献
17.
Arsalan Wares 《International Journal of Mathematical Education in Science & Technology》2019,50(4):636-641
The purpose of this note is to discuss how paper folding can be used to find the exact trigonometric ratios of the following four angles: 22.5°, 67.5°, 27°, and 63°. 相似文献
18.
19.
20.
Olga V. Petrova Arsalan B. Budaev Elena F. Sagitova Igor A. Ushakov Lyubov N. Sobenina Andrey V. Ivanov Boris A. Trofimov 《Molecules (Basel, Switzerland)》2021,26(6)
An efficient method for the synthesis of pharmaceutically prospective pyrrole–aminopyrimidine ensembles (in up to 91% yield) by the cyclocondensation of easily available acylethynylpyrroles with guanidine nitrate has been developed. The reaction proceeds under heating (110–115 °C, 4 h) in the KOH/DMSO system. In the case of 2-benzoylethynylpyrrole, the unexpected addition of the formed pyrrole–aminopyrimidine as N- (NH moiety of the pyrrole ring) and C- (CH of aminopyrimidine) nucleophiles to the triple bond is observed. 相似文献