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Rapid Synthesis (rapid + synthesis)
Selected AbstractsRapid Synthesis of Non-Aggregated Fine Chloroapatite Blue Phosphor Powders with High Quantum Efficiency,ADVANCED MATERIALS, Issue 18 2008Wei-Ning Wang Sub-micrometer-sized chloroapatite blue phosphors are successfully synthesized from aqueous precursors using a spray pyrolysis method with a very short processing time and without any post-heat treatments. The as-prepared phosphors reveal high quantum efficiency in the long-UV range (around 80% under excitation at 400,nm), spherical morphology, high crystallinity, and high color purity, showing great promise for white LED applications. [source] Palladium-Catalyzed Sequential Reactions via Allene Intermediates for the Rapid Synthesis of Fused Polycyclic Pyrrole DerivativesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2009Xian Huang Abstract In this paper, we report a novel sequential reaction sequence consisting of a series of processes including Sonogashira coupling, propargyl-allenyl isomerization, [3+2],cycloaddition, denitrogenation, and highly selective biradical coupling reaction, providing an efficient synthesis of fused polycyclic pyrrole derivatives. The reaction features one CC bond and two CN bonds formed to construct the pyrrole unit, together with two rings efficiently assembled in one stroke. [source] Rapid Synthesis and MALDI-ToF Characterization of Poly(ethylene oxide) Multiarm Star PolymersMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 1 2010Maria Doycheva Abstract Multiarm PEO star polymers with a purely aliphatic polyether structure have been synthesized using hyperbranched polyglycerol (PG) with different molecular weights as a multifunctional initiator. Different degrees of deprotonation of the initiator were studied with respect to molecular weight control. The results show that the degree of deprotonation is a crucial parameter for the synthesis of well-defined polymers with controlled molecular weights. Partial deprotonation of the PG hydroxyl groups (5,8%) was proven to represent an optimum for the synthesis of star polymers with molecular masses close to the theoretical values. Molecular weights of the stars ranged between 9,000 and 30,000,g,·,mol,1. MALDI-ToF spectra confirmed that the PEO arms in the star polymers possess homogeneous lengths. [source] Rapid Synthesis of Cyclopeptide Alkaloid-Like para -Cyclophanes by Combined Use of Ugi-4CR and Intramolecular SNAr ReactionMOLECULAR INFORMATICS, Issue 5-6 2006Pierre Cristau First page of article [source] ChemInform Abstract: Water-Controlled Regioselectivity of Pd-Catalyzed Domino Reaction Involving a C,H Activation Process: Rapid Synthesis of Diverse Carbo- and Heterocyclic Skeletons.CHEMINFORM, Issue 26 2010Zhiyao Lu 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: Iodine-Catalyzed Three-Component Reaction: A Rapid Synthesis of ,-Alkoxy Azides and Homoallyl Ethers.CHEMINFORM, Issue 32 2009Jhillu S. Yadav 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: Rapid Synthesis of Perovskite-Type LaFeO3 Nanoparticles by Microwave-Assisted Decomposition of Bimetallic La[Fe(CN)6]·5H2O Compound.CHEMINFORM, Issue 22 2009Saeid Farhadi 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 and hetero-Diels,Alder Reactions of an o-Quinone Methide under Mild, Anionic Conditions: Rapid Synthesis of mono-Benzanellated Spiroketals.CHEMINFORM, Issue 51 2008Christopher D. Bray 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: Rapid Synthesis of Bi and Sb Sulfides Using Electric Discharge Assisted Mechanical Milling.CHEMINFORM, Issue 30 2008A. Calka 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: Rapid Synthesis of Medium-Ring Fused Polycarbocyclic Systems by Rearrangement of Carbenoid-Derived Oxonium Ylides.CHEMINFORM, Issue 9 2008J. Stephen Clark 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] Novel Oxidation of Substituted Pyrrolidines by N-Bromosuccinimide , Rapid Synthesis of Pyrrolo[2,1-a]isoquinolines (II).CHEMINFORM, Issue 38 2007Judit Toth 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] Domino Addition/N,C Heterocyclization of Azides with Allenyl Magnesium Bromide: Rapid Synthesis of 5-Butynyl-1,2,3-triazoles.CHEMINFORM, Issue 34 2007Syed Shafi 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 Rapid Synthesis of 1-Substituted-1H-1,2,3,4-tetrazoles in the Acidic Ionic Liquid 1-n-Butylimidazolium Tetrafluoroborate.CHEMINFORM, Issue 23 2007Taterao M. Potewar 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] Rapid Synthesis of the N-Methylwelwitindolinone Skeleton.CHEMINFORM, Issue 49 2005James A. MacKay Abstract For Abstract see ChemInform Abstract in Full Text. [source] The gem-Dialkyl Effect in Electron Transfer Reactions: Rapid Synthesis of Seven-Membered Rings Through an Electrochemical Annulation.CHEMINFORM, Issue 42 2005Jeffrey B. Sperry Abstract For Abstract see ChemInform Abstract in Full Text. [source] Room Temperature Ionic Liquid Promoted Improved and Rapid Synthesis of 2,4,5-Triaryl Imidazoles from Aryl Aldehydes and 1,2-Diketones or ,-Hydroxyketone.CHEMINFORM, Issue 31 2005Shapi A. Siddiqui Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Clean and Rapid Synthesis of 5-Amino and 5-Alkoxycarbonylpyrazoles Using Montmorillonite under Acid Free Conditions.CHEMINFORM, Issue 10 2005G. Jagath Reddy Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Short, Rapid Synthesis and Heliannuol D, an Allelochemical from Helianthus annus Employing Ring-Closing Metathesis.CHEMINFORM, Issue 26 2004Subir K. Sabui No abstract is available for this article. [source] An Efficient and Rapid Synthesis of ,-Carboxamide Derivatives Using 2,2-Dimethyl-2H,4H-1,3-dioxin-4-ones by Microwave Irradiation.CHEMINFORM, Issue 2 2004Bruhaspathy Miriyala Abstract For Abstract see ChemInform Abstract in Full Text. [source] Rapid Synthesis of Substituted 5-Phenyl-1,3-dioxolan-4-ones under Microwave-Induced Solvent-Free Conditions.CHEMINFORM, Issue 26 2003Rochelle R. Ferrett Abstract For Abstract see ChemInform Abstract in Full Text. [source] Molecular Iodine-Catalyzed Efficient and Highly Rapid Synthesis of Bis(indolyl)methanes under Mild Conditions.CHEMINFORM, Issue 21 2003B. P. Bandgar Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: InCl3,SiO2 -Catalyzed Electrophilic Amination of Arenes: A Facile and Rapid Synthesis of Aryl Hydrazides.CHEMINFORM, Issue 8 2002J. S. Yadav 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] A General Method for the Rapid Synthesis of Hollow Metallic or Bimetallic Nanoelectrocatalysts with Urchinlike MorphologyCHEMISTRY - A EUROPEAN JOURNAL, Issue 15 2008Shaojun Guo Abstract We have reported a facile and general method for the rapid synthesis of hollow nanostructures with urchinlike morphology. In-situ produced Ag nanoparticles can be used as sacrificial templates to rapidly synthesize diverse hollow urchinlike metallic or bimetallic (such as Au/Pt) nanostructures. It has been found that heating the solution at 100,°C during the galvanic replacement is very necessary for obtaining urchinlike nanostructures. Through changing the molar ratios of Ag to Pt, the wall thickness of hollow nanospheres can be easily controlled; through changing the diameter of Ag nanoparticles, the size of cavity of hollow nanospheres can be facilely controlled; through changing the morphologies of Ag nanostructures from nanoparticle to nanowire, hollow Pt nanotubes can be easily designed. This one-pot approach can be extended to synthesize other hollow nanospheres such as Pd, Pd/Pt, Au/Pd, and Au/Pt. The features of this technique are that it is facile, quick, economical, and versatile. Most importantly, the hollow bimetallic nanospheres (Au/Pt and Pd/Pt) obtained here exhibit an area of greater electrochemical activity than other Pt hollow or solid nanospheres. In addition, the ,6,nm hollow urchinlike Pt nanospheres can achieve a potential of up to 0.57,V for oxygen reduction, which is about 200,mV more positive than that obtained by using a ,6,nm Pt nanoparticle modified glassy carbon (GC) electrode. Rotating ring-disk electrode (RRDE) voltammetry demonstrates that ,6,nm hollow Pt nanospheres can catalyze an almost four-electron reduction of O2 to H2O in air-saturated H2SO4 (0.5,M). Finally, compared to the ,6,nm Pt nanoparticle catalyst, the ,6,nm hollow urchinlike Pt nanosphere catalyst exhibits a superior electrocatalytic activity toward the methanol oxidation reaction at the same Pt loadings. [source] Flame-Synthesized Ceria-Supported Copper Dimers for Preferential Oxidation of COADVANCED FUNCTIONAL MATERIALS, Issue 3 2009Richard Kydd Abstract Rapid synthesis of CuCeO2 catalysts by flame spray pyrolysis produces highly active Cu dimer morphologies without the need for additional catalyst pretreatment. The active Cu component is enriched onto the CeO2 surface at concentrations higher than the nominal loading with no evidence of amorphous or crystalline CuO phase. Increasing the Cu content results in a morphological transition from isolated Cu monomers to oxygen-bridged dimers and an associated increase in oxygen vacancy concentration. Dimer-containing CuCeO2 catalysts display high levels of activity and selectivity in the low-temperature preferential oxidation of CO. Experimental measurements and simulations suggest that the geometry of the dimer presents a comparatively ionic CuO bond at the catalyst surface. Further studies indicate that these ionic dimer species promote preferential CO oxidation at lower temperatures than observed for monomeric Cu species. This is the first report to explicitly propose and demonstrate that the structural distortion associated with the formation of Cu dimers directly induces increased bond ionicity at the catalyst surface and that these changes are responsible for improved catalytic activity. [source] Rapid synthesis of lead oxide nanorods by one-step solid-state chemical reaction at room temperatureCHINESE JOURNAL OF CHEMISTRY, Issue 11 2004Ya-Li Cao Abstract A simple and facile method was reported to synthesize lead oxide nanorods. Nanorods of lead oxide were obtained directly from grinding solid metal salt and sodium hydroxide in agate mortar with the assistance of a suitable nonionic surfactant in only one step, which is different from the result of hydroxide in solution. The product has been characterized by XRD, TEM and SEM. The formation mechanism of rod-like morphology is discussed and the surfactant plays an important soft-template role in modifying the interface of solid-state reaction and according process of rod-formation. [source] 2-Substituted Benzo[b]furans from (E)-1,2-Dichlorovinyl Ethers and Organoboron Reagents: Scope and Mechanistic Investigations into the One-Pot Suzuki Coupling/Direct Arylation,EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 29 2010Laina M. Geary Abstract 2-Substituted benzo[b]furans can easily be assembled from simple phenols, boronic acids or other organoboron reagents, and trichloroethylene. The overall process requires only two synthetic steps, with the key step being a one-pot sequential Suzuki cross-coupling/direct arylation reaction. The method tolerates many useful functional groups and does not require the installation of any other activating functionality. The modular nature of the process permits the rapid synthesis of many analogues using essentially the same chemistry, of particular value in drug development. Results of kinetic isotope effect studies and investigations into the regioselectivity of the process indicate that the direct arylation step most likely does not involve an electrophilic palladation. The most likely mechanism lies somewhere on the continuum between a C,H bond metathesis and an assisted palladation or concerted metallation-deprotonation pathway. [source] Quantitative modeling of triacylglycerol homeostasis in yeast , metabolic requirement for lipolysis to promote membrane lipid synthesis and cellular growthFEBS JOURNAL, Issue 22 2008Jürgen Zanghellini Triacylglycerol metabolism in Saccharomyces cerevisiae was analyzed quantitatively using a systems biological approach. Cellular growth, glucose uptake and ethanol secretion were measured as a function of time and used as input for a dynamic flux-balance model. By combining dynamic mass balances for key metabolites with a detailed steady-state analysis, we trained a model network and simulated the time-dependent degradation of cellular triacylglycerol and its interaction with fatty acid and membrane lipid synthesis. This approach described precisely, both qualitatively and quantitatively, the time evolution of various key metabolites in a consistent and self-contained manner, and the predictions were found to be in excellent agreement with experimental data. We showed that, during pre-logarithmic growth, lipolysis of triacylglycerol allows for the rapid synthesis of membrane lipids, whereas de novo fatty acid synthesis plays only a minor role during this growth phase. Progress in triacylglycerol hydrolysis directly correlates with an increase in cell size, demonstrating the importance of lipolysis for supporting efficient growth initiation. [source] Combining microwave and ultrasound irradiation for rapid synthesis of nanowires: a case study on Pb(OH)BrJOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 12 2009Xiao-Fang Shen Abstract BACKGROUND: One-dimensional (1D) nanostructures such as wires, tubes and belts have attracted much attention in recent years because of their fascinating properties and promising applications, and various methods have been developed to prepare 1D nanostructures. Microwave and ultrasound, two methodologies for rapid synthesis, have both been applied to fabricate nanostructures. This paper reports on combining microwave and ultrasound irradiation as a new strategy for rapid synthesis of nanowires. Using Pb(OH)Br as a study case, nanowires were rapidly synthesized under the combined irradiation. The use of the ionic liquid 1-butyl-3-methylimidazolium bromide as a structure-directing agent and microwave absorbent significantly simplified the preparation procedure. RESULTS: Combined microwave,ultrasound irradiation at (50 W,50 W) greatly reduced the reaction time (10 min) and significantly increased the product yield (45.0%) in comparison with conventional heating (24 h reaction time, 23.0% yield). Combined microwave,ultrasound irradiation at (50 W,50 W) also changed the resultant wires from 20,30 µm diameter and 2,3 mm long to 80,800 nm and 50,100 µm, respectively. Further increase in power of the combined irradiation (250 W,50 W) led to a dramatic reduction in the reaction time (80 s) with a slightly increased yield of 48.2%. CONCLUSIONS: The obvious advantages of combined microwave,ultrasound irradiation are marked improvement of the product yield, significant enhancement of reaction rate and increased aspect ratio of the 1D structure. Copyright © 2009 Society of Chemical Industry [source] A rapid synthesis of new benzene-centered porphyrin trimersJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 5 2007Cyril A. Papamicaėl In connection with our study of the capability of forming ordered self-assembled monolayers on gold substrates, we described the full details concerning the rapid synthesis of two rigid, star-shaped D3 -symmetric arrays with a benzene core attached to three identical metalloporphyrins containing either ethyldisulfide functions or thienyl groups. [source] One-pot three-component synthesis of 2-substituted 4-aminoquinazolinesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 4 2006Kurosh Rad-Moghadam A facile and rapid synthesis of the title compounds via one-pot reaction of 2-aminobenzonitrile, orthoesters and ammonium acetate under solvent-free and microwave condition is described. [source] | ||||||||||||||||||||||||||||