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排序方式: 共有165条查询结果,搜索用时 31 毫秒
131.
Amirmahani Najmeh Mahmoodi Nosrat O. Malakootian Mohammad Pardakhty Abbas Seyedi Neda 《Research on Chemical Intermediates》2020,46(10):4595-4609
Research on Chemical Intermediates - In this work, Pd nanoparticles (Pd-NPs) were decorated on modified magnetic nanoparticles (MNPs) and used as an efficient and recyclable catalyst for the Suzuki... 相似文献
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This paper presents a detailed study on the implementation of Weighted Essentially Non‐Oscillatory (WENO) schemes on GPU. GPU implementation of up to ninth‐order accurate WENO schemes for the multi‐dimensional Euler equations of gas dynamics is presented. The implementation detail is discussed in the paper. The computational times of different schemes are obtained and the speedups are reported for different number of grid points. Furthermore, the execution times for the main kernels of the code are given and compared with each other. The numerical experiments show the speedups for the WENO schemes are very promising especially for fine grids. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Khalil Tabatabaeian Hannaneh Heidari Manouchehr Mamaghani Nosrat O. Mahmoodi 《应用有机金属化学》2012,26(2):56-61
A number of ruthenium complexes were prepared and their catalytic activities in three‐component one‐pot condensation of aldehydes, malononitrile and 4‐hydroxycoumarin or dimedone was considered to afford dihydropyrano[3,2‐c]chromenes and tetrahydrobenzo[b]pyran derivatives under optimum reaction conditions. We found that a catalytic amount of RuBr2(PPh3)4 efficiently promotes the reaction in a short time (3–15 min) and with high yield (75–88%). Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Ziba Khodaee Asieh Yahyazadeh Nosrat O. Mahmoodi 《Journal of heterocyclic chemistry》2013,50(2):288-292
The synthesis and structural elucidation of some novel 5,5′‐disubstituted spiro and nonspiro‐bis‐hydantoins are reported. The Bucherer Burge's method has been modified for the preparation of some 5,5′‐substituted bis(imidazolidine‐2,4‐dione) derivatives starting with diketones ( 1–5 ) and dialdehydes ( 6 , 7 ). In some cases, diastereoisomeric mixtures of compounds were obtained. The resulting bis‐hydantoins ( 8–11 , 13 , 14 ) have not to our knowledge been previously reported in the literature. 相似文献
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Hydrogen peroxide (H2O2) or urea–hydrogen peroxide (UHP) in basic media react with carbon–carbon double bonds of 1,4-diaroyl ethenes to produce the corresponding epoxides. 相似文献
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Unsymmetricai coupling utilizing the reaction of acylsulfonamide dianions with alpha-iodocarboxylate salts followed by a sequence consisting of selective reduction of the carboxylic acid group, hydrolysis of the acylsulfonamide, and spontaneous ring closure affords 2,3-disubstituted butyrolactones. 相似文献
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Pegah Farokhian Manouchehr Mamaghani Nosrat Ollah Mahmoodi Khalil Tabatabaeian 《Journal of the Iranian Chemical Society》2018,15(1):11-16
An efficient and practical protocol was developed for the synthesis of novel pyrano[2,3-c]pyrazoles and bis-pyrano[2,3-c]pyrazoles by one-pot four-component reaction of arylaldehyde, ethyl acetoacetate, hydrazine hydrate and dimethyl malonate using SO3H-functionalized ionic liquid [DMBSI]HSO4 as a potential green catalyst under solvent-free condition. The method presented is mild, environmentally friendly, inexpensive and functionality tolerant and produces the desired pyranopyrazoles in short reaction times (17–24 min) and excellent yields (85–95%). In addition, the catalyst can be reused at least ten times without almost any change in its catalytic activity. 相似文献