共查询到20条相似文献,搜索用时 15 毫秒
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Pinhua Li Lei Wang Lei Zhang Guan‐Wu Wang 《Advanced Synthesis \u0026amp; Catalysis》2012,354(7):1307-1318
A highly efficient, air‐ and moisture‐stable and easily recoverable magnetic nanoparticle‐supported palladium catalyst has been developed for the Suzuki, Sonogashira and Heck reactions. A wide range of substrates was coupled successfully under aerobic conditions. In particular, the performance of the magnetic separation of the catalyst was very efficient, and it is possible to recover and reuse it at least eight times without significant loss of its catalytic activity. 相似文献
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M. Lakshmi Kantam K.B. Shiva Kumar P. Srinivas B. Sreedhar 《Advanced Synthesis \u0026amp; Catalysis》2007,349(7):1141-1149
A fluorapatite‐supported palladium catalyst (PdFAP) was synthesized by treatment of fluorapatite (prepared by incorporating the basic species fluoride ion into apatite in situ by co‐precipitation) with bis(benzonitrile)palladium(II ) chloride in acetone. The catalyst displayed high catalytic activity for Suzuki coupling of aryl iodides and bromides with boronic acids at room temperature and chloroarenes at 130 °C in the presence of tetrabutylammonium bromide to give biaryls in excellent yields. Heck olefination of chloroarenes was also successfully carried out by this catalyst. PdFAP was recovered quantitatively by simple filtration and reused with consistent activity. PdFAP was well characterized by XRD, FTIR, XPS, ICP‐AES, CO2 TPD and CHN elemental analysis. 相似文献
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Mehdi Hatefi Ardakani Samira Saeednia Parvaneh Iranmanesh Behnam Konani 《Journal of Inorganic and Organometallic Polymers and Materials》2017,27(1):146-155
A copper(II) complex containing tetradentate N2O2 Schiff base ligand immobilized into aminopropyl-functionalised MCM-41 (mobile crystalline material number 41), was prepared and characterized by Fourier-transform infrared, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, N2 adsorption–desorption and inductively coupled plasma analysis techniques. The novel heterogeneous catalyst, MCM-41-pr-NH2-CuL, can be successfully applied for efficient and selective oxidation of different primary and secondary alcohols to the corresponding carbonyl compounds using hydrogen peroxide as an oxidant in acetonitrile at 60 °C. The effect of reaction parameters such as solvent, amount of catalyst, temperature and kind of oxidant on the oxidation of benzyl alcohol was also studied. The prepared catalyst could be recovered and reused four times without important loss of its catalytic performance. The heterogeneous MCM-41-pr-NH2-CuL catalyst was found to be catalytically more active in the oxidation of alcohols compared to the similar type of copper(II) Schiff base complex in homogeneous media under the same reaction conditions. 相似文献
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AndrH.M. deVries FlorisJ. Parlevliet Lizette Schmieder‐vandeVondervoort JohnH.M. Mommers HuubJ.W. Henderickx MoniqueA.M. Walet JohannesG. deVries 《Advanced Synthesis \u0026amp; Catalysis》2002,344(9):996-1002
Ligand‐free palladium can be recovered almost quantitatively from Heck reaction mixtures by filtration after its deposition on a carrier such as silica or celite. Subsequently, it is re‐activated to its original activity by adding a small amount of iodine or bromine prior to the next reaction cycle. The catalyst results in excellent yields and selectivities, even for the less reactive aryl bromides. A catalytic cycle based on anionic palladium intermediates is proposed. 相似文献
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Sk. Manirul Islam Kajari Ghosh Anupam Singha Roy Noor Salam Tanmay Chatterjee 《Journal of Inorganic and Organometallic Polymers and Materials》2014,24(2):457-467
A polymer-anchored iron(III) catalyst was synthesized and characterized. Its catalytic activity was evaluated for the oxidation of various alkenes, sulfides, aromatic alcohols and ethylbenzene with 30 % H2O2 as the oxidizing agent. The catalyst was also effective for the oxidative bromination reaction with 80–100 % selectivity of monobrominated products with H2O2/KBr at room temperature. The above reactions require a minimum amount of H2O2 and short reaction time. Most importantly, all the above reactions occur in aqueous medium. The catalyst can be facilely recovered and reused six-atimes without significant decrease in its activity and selectivity. 相似文献
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A highly efficient Suzuki cross-coupling reaction between phenyl bromide and phenylboronic acid catalyzed by the palladium complex Pd[tBuNH(S)NHP(O)(OiPr)2-S]2Cl2 in acetonitrile, toluene, THF or DMF has been investigated. The bases we have employed for this reaction were Na2CO3, K2CO3 or Cs2CO3. It was established that using DMF and K2CO3 at 100 °C shows excellent yields of the product at the catalyst amount of 0.1 mmol. The cross-coupling reactions of iodo- and chloro-benzene with phenylboronic acid were also investigated. The influence of the halide nature was as expected. 相似文献
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Mercapto-functionalized MCM-41 anchored palladium(0) complex is an efficient catalyst for the heterogeneous Suzuki reaction
of arylboronic acids with aryl halides. Our system not only solves the basic problems of catalyst separation and recovery
but also avoids the use of phosphine ligands. 相似文献
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Abdel‐Moneim Abu‐Elfotoh Diem Phuong Thi Nguyen Soda Chanthamath Kesiny Phomkeona Kazutaka Shibatomi Seiji Iwasa 《Advanced Synthesis \u0026amp; Catalysis》2012,354(18):3435-3439
The intramolecular cyclopropanation of various trans‐allylic diazoacetates and alkenyl diazoketones has been achieved with excellent enantioselectivities of up to 98% ee and in quantitative yields by using a water‐soluble ruthenium(II)/hydroxymethyl(phenyl)oxazoline catalyst in a water/ether biphasic medium. The catalyst could be reused at least five times. 相似文献
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Suzuki cross-coupling reaction between phenyl bromide and phenylboronic acid, catalyzed by the palladium complex Pd[N-MorphC(S)NP(O)(OiPr)2-1,5-O,S)]2 in acetonitrile, toluene, THF or DMF has been investigated. Bases employed for the reaction were Na2CO3, K2CO3 or Cs2CO3. Varying largely the experimental conditions we found that excellent yields of the product were obtained using toluene and K2CO3 at 100 °C at the catalyst amount of 0.02 mmol. 相似文献
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Guanlei Xie Prinessa Chellan Jincheng Mao Kelly Chibale GregoryS. Smith 《Advanced Synthesis \u0026amp; Catalysis》2010,352(10):1641-1647
Four tridentate thiosemicarbazone salicylaldiminato‐palladium(II) complexes of the general formula [Pd(saltsc‐R)PPh3] [saltsc=salicylaldehyde thiosemicarbazone; R=H ( 1 ), 3‐tert‐butyl ( 2 ), 3‐methoxy ( 3 ), 5‐chloro ( 4 )], have been evaluated as catalyst precursors for the Mizoroki–Heck coupling reaction between a variety of electron‐rich and electron‐poor aryl halides and olefins. The palladium complexes (0.1–1 mol% loading) were found to effectively catalyze these reactions with high yields being obtained when aryl iodides and aryl bromides were utilized. The effects of base, catalyst loading, reaction temperature and reaction time on the catalytic activity of the most active complex were also investigated. 相似文献
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Marc Lamblin Luma Nassar‐Hardy Jean‐Cyrille Hierso Eric Fouquet Franois‐Xavier Felpin 《Advanced Synthesis \u0026amp; Catalysis》2010,352(1):33-79
This review summarizes the progress made essentially these last ten years on heterogeneous palladium catalysis in pure water. The work covers four important palladium‐catalyzed transformations for carbon‐carbon bond formation: Suzuki, Heck, Sonogashira and Tsuji–Trost reactions. The discussion focuses on the efficiency and reusability of the heterogeneous catalysts as well as on the experimental conditions from a sustainable chemistry point of view. The review is introduced by a discussion on mechanistic aspects inherent to heterogeneous catalysis. 相似文献