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Catalytic System (catalytic + system)
Kinds of Catalytic System Terms modified by Catalytic System Selected AbstractsA Novel, Highly Efficient, One-Pot Synthesis of 1,4-Dihydroquinoline Derivatives in the Presence of a Pd(OAc)2/DABCO Catalytic SystemEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 29 2009Xiao-Jin Wu Abstract The Pd(OAc)2/DABCO catalytic system was first found to be highly efficient for C,N cross-coupling reactions. With the aid of this transformation, a variety of new 1,4-dihydroquinoline derivatives were synthesized from o -halobenzaldehydes and various ,-enaminones in good to excellent yields. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] A Novel Approach to the Practical Synthesis of Sulfides: An InBr3,Et3SiH Catalytic System Promoted the Direct Reductive Sulfidation of Acetals with DisulfidesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 24 2009Norio Sakai Abstract We have demonstrated a facile and direct synthesis of sulfide derivatives using acetals and ketals, derived from aromatic/conjugated aldehydes and aromatic ketones, with disulfides and the InBr3,Et3SiH reducing system. We also succeeded in developing an unprecedented one-pot preparation of an aliphatic sulfide from a disulfide and an aliphatic acetal. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] TEMPO and Carboxylic Acid Functionalized Imidazolium Salts/Sodium Nitrite: An Efficient, Reusable, Transition Metal-Free Catalytic System for Aerobic Oxidation of AlcoholsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2009Cheng-Xia Miao Abstract An effective catalytic system comprising a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) functionalized imidazolium salt ([Imim-TEMPO]+,X,), a carboxylic acid substituted imidazolium salt ([Imim-COOH]+,X,), and sodium nitrite (NaNO2) was developed for the aerobic oxidation of aliphatic, allylic, heterocyclic and benzylic alcohols to the respective carbonyl compounds with excellent selectivity up to >99%, even at ambient conditions. Notably, the catalyst system could preferentially oxidize a primary alcohol to the aldehyde rather than a secondary alcohol to the ketone. Moreover, the reaction rate is greatly enhanced when a proper amount of water is present. And a high turnover number (TON 5000) is achieved in the present transition metal-free aerobic catalytic system. Additionally, the functionalized imidazolium salts are successfully reused at least four times. This process thus represents a greener pathway for the aerobic oxidation of alcohols into carbonyl compounds by using the present task-specific ionic liquids in place of the toxic and volatile additive, such as hydrogen bromide, bromine, or hydrogen chloride (HBr, Br2 or HCl), which is commonly required for the transition metal-free aerobic oxidation of alcohols. [source] TEMPO- tert -Butyl Nitrite: An Efficient Catalytic System for Aerobic Oxidation of AlcoholsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1-2 2009Xijun He Abstract A metal-free catalytic system consisting of 2,2,6,6-tetramethylpiperidine N -oxyl (TEMPO) and tert -butyl nitrite has been developed to activate molecular oxygen for the aerobic oxidation of alcohols. A variety of active and non-active alcohols were oxidized to their corresponding carbonyl compounds in high selectivity and yields. [source] Selective Oxidation of Aromatic Amines to Nitro Derivatives using Potassium Iodide- tert -Butyl Hydroperoxide Catalytic SystemADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1-2 2009K. Rajender Reddy Abstract The direct oxidation of aromatic primary amines to the corresponding nitro compounds selectively in 47,98% yields has been achieved by using potassium iodide as catalyst and tert -butyl hydroperoxide as the external oxidant. The present catalytic system works well for both electron-rich and electron-poor substrates. [source] Sharpless Asymmetric Dihydroxylation of Olefins in WaterSurfactant Media with Recycling of the Catalytic System by Membrane NanofiltrationADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2008Abstract This paper presents a new and more sustainable alternative approach for the Sharpless catalytic asymmetric dihydroxylation (AD) of olefins using a water/surfactant system as reaction media. The AD reaction was performed using several cationic and anionic surfactants allowing yields and enantiomeric excesses higher or comparable with the conventional systems (using organic mixtures). The use of this water/surfactant medium offers the additional advantage of performing the reactions without the need of a slow addition of olefins. Asymmetric dihydroxylation of 1-hexene in a 1.5,mM sodium cholate aqueous solution, using N -methylmorpholine N -oxide (NMO) as co-oxidant was selected as model system to evaluate the feasibility of recycling the Sharpless catalytic system by nanofiltration. The reaction media was processed by nanofiltration, the product was isolated in the permeate, whereas the catalytic system and surfactant were retained by the membrane and recycled through six successive reactions, improving the catalyst turn-over number. The experimental results were compared with the ones calculated on the basis of mass balances, membrane rejections to product and reaction yields. [source] Modeling of Slurry Polymerization of Ethylene Using a Soluble Cp2ZrCl2/MAO Catalytic SystemMACROMOLECULAR THEORY AND SIMULATIONS, Issue 5 2007Mostafa Ahmadi Abstract The slurry homopolymerization of ethylene catalyzed by a Cp2ZrCl2/MAO catalytic system was studied. A simple kinetic model including initiation, propagation, transfer to monomer and cocatalyst, spontaneous transfer and spontaneous deactivation was developed to predict dynamic yield of polymerization and molecular weight of final products. Kinetic constants were estimated by numerical solution of polymerization kinetic model, combined with Nelder-Mead simplex method. The model predicts that the propagation reaction has the lower activation energy in relation to chain transfer reactions which leads to decrease of molecular weight at elevated temperatures. The initiation reaction has however, the highest activation energy that results in raising the peak of reaction rate at higher temperatures. [source] Selective and Flexible Transformation of Biomass-Derived Platform Chemicals by a Multifunctional Catalytic System,ANGEWANDTE CHEMIE, Issue 32 2010Frank Eine nachhaltige Versorgungskette: Die kontrollierte Überführung der aus Biomasse erhaltenen Plattformverbindungen Lävulinsäure (LA) und Itaconsäure (IA) in die entsprechenden Lactone, Diole oder cyclischen Ether (siehe Bild) wird durch einen multifunktionellen molekularen Katalysator möglich. [source] ChemInform Abstract: A Simple and Efficient Catalytic System for Coupling Aryl Halides with Aqueous Ammonia in Water.CHEMINFORM, Issue 35 2010Zhiqing Wu No abstract is available for this article. [source] ChemInform Abstract: KHSO4 as an Efficient Catalytic System for the Regiospecific Nitration of Phenols with Metal Nitrates.CHEMINFORM, Issue 31 2010Bita Baghernejad Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Al(HSO4)3/Silica Gel as a Novel Catalytic System for the Ring Opening of Epoxides with Thiocyanate Anion under Solvent-Free Conditions.CHEMINFORM, Issue 26 2010Ali Reza Kiasat Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Highly Efficient Catalytic System for Electrophilic Amination of Arylzinc Reagents.CHEMINFORM, Issue 19 2010Tahir Daskapan Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Exceptionally Simple Catalytic System for the Carbonylation of Benzyl Halides.CHEMINFORM, Issue 6 2010Albert L. Lapidus Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: TEMPO and Carboxylic Acid Functionalized Imidazolium Salts/Sodium Nitrite: An Efficient, Reusable, Transition Metal-Free Catalytic System for Aerobic Oxidation of Alcohols.CHEMINFORM, Issue 5 2010Cheng-Xia Miao Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Synthesis of Epoxides Catalyzed by a Halide-Free Reaction-Controlled Phase-Transfer Catalytic System: [(CH3(CH2)17)2N (CH3)2]3[PW4O32] /H2O2/Dioxan/Olefin.CHEMINFORM, Issue 51 2009Yong Ding Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Generation of Pd Nanoparticles in situ from PdCl2 in TBAF: An Efficient and Reusable Catalytic System for the Suzuki,Miyaura Reaction under Ligand- and Solvent-Free Conditions.CHEMINFORM, Issue 47 2009Liming Tao Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A Convenient Route to Chiral ,-Lactones (II) via Asymmetric Hydrogenation of ,-Ketoesters Using the RuCl3,BINAP,HCl Catalytic System.CHEMINFORM, Issue 19 2009Eugenia V. Starodubtseva Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Copper Methanesulfonate,Acetic Acid as a Novel Catalytic System for Tetrahydropyranylation of Alcohols and Phenols.CHEMINFORM, Issue 18 2008Min Wang Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Ruthenium/Halide Catalytic System for C,C Bond Forming Reaction Between Alkynes and Unsaturated Carbonyl Compounds.CHEMINFORM, Issue 15 2008Takahiro Nishimura Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A Simple PdCl2/O2/DMF Catalytic System for Highly Regioselective Cyclotrimerization of Olefins with Electron-Withdrawing Groups.CHEMINFORM, Issue 3 2008Huan-Feng Jiang Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] SeO2/H2O2/H2O-Dioxane: A New Catalytic System for trans Dihydroxylation of Olefins.CHEMINFORM, Issue 51 2007Pranjal Gogoi Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] N-Arylimidazole Synthesis by Cross-Cycloaddition of Isocyanides Using a Novel Catalytic System.CHEMINFORM, Issue 37 2007Marc-Andre Bonin Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Palladium-N-heterocyclic Carbene, an Efficient Catalytic System for the Carbonylative Cross-Coupling of Pyridine Halides with Boronic Acids.CHEMINFORM, Issue 21 2007Eddy Maerten Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] An Environmentally Benign Catalytic System for Alkene Epoxidation with Hydrogen Peroxide Electrogenerated in situ.CHEMINFORM, Issue 8 2007Kam-Piu Ho Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Reaction of Aromatic Aldehydes with ,-Dicarbonyl Compounds in a Catalytic System: Piperidinium Acetate , 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid.CHEMINFORM, Issue 30 2006E. S. Putilova Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Efficient Ruthenium-Catalyzed Aerobic Oxidation of Amines Using a Biomimetic Coupled Catalytic System.CHEMINFORM, Issue 14 2006Joseph S. M. Samec Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Efficient and Copper-Free Sonogashira Cross-Coupling Reaction Catalyzed by Pd(OAc)2/Pyrimidines Catalytic System.CHEMINFORM, Issue 9 2006Jin-Heng Li Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Aerobic Oxidative Coupling of 2-Naphthols by Simple Copper Salts: A Highly Efficient Catalytic System in the Absence of Ligand or Carrier.CHEMINFORM, Issue 48 2005Shi-Yong Zhang No abstract is available for this article. [source] Catalytic System for the Heck Reaction of Fluorinated Haloaryls.CHEMINFORM, Issue 46 2005Ana C. Albeniz Abstract For Abstract see ChemInform Abstract in Full Text. [source] An Efficient Stille Cross-Coupling Reaction Catalyzed by Pd(OAc)2/DAB-Cy Catalytic System.CHEMINFORM, Issue 45 2005Jin-Heng Li No abstract is available for this article. [source] | ||||||||||||||||||||||||||||