Home About us Contact
|
Home About us Contact | ||
|
|
||
Facile Route (facile + route)
Selected AbstractsAnion-Dependent Facile Route to Magnetic Dinuclear and Dodecanuclear Cobalt ClustersEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 15 2010Ling-Ling Zheng Abstract An unprecedented dodecanuclear CoIII3CoII9 and a dinuclear CoII2 cluster were synthesized facilely from reactions of different coblt(II) salts with the ligand (1H -benzimidazol-2-yl)methanol. The cobalt ions in the Co12 supercluster are linked into a disclike structures through ,3 -OL, ,-OL, ,3 -O2,, ,1,1 -N3, and ,1,1,1 -N3, bridges. Magnetic studies reveal that strong ferromagnetic coupling through double end-on (EO) azido bridges exists in 1, while both ferromagnetic coupling through the ,3 -OL and ,-OL pathways and antiferromagnetc coupling through the ,1,1,1 -N3, pathway exist in 2, which results in a ferrimagnetic behaviour of 2. [source] A Facile Route to Polymer Solar Cells with Optimum Morphology Readily Applicable to a Roll-to-Roll Process without Sacrificing High Device PerformancesADVANCED MATERIALS, Issue 35 2010Hui Joon Park A new fabrication method for polymer solar cells that can produce optimized vertical distribution of components is reported. The favorable donor,acceptor morphology showing a well-organized photo-induced charge transporting pathway with fine nanodomains and high crystallinity is achieved. This process is also readily scalable to a large-area and high-speed roll-to-roll process without sacrificing high device performances, even without a PEDOT:PSS layer. [source] A Facile Route to ZnS,Polymer Nanocomposite Optical Materials with High Nanophase Content via ,-Ray Irradiation Initiated Bulk Polymerization,ADVANCED MATERIALS, Issue 9 2006C. Lü Transparent ZnS/polymer bulk nanocomposites with high particle contents are prepared via ,-ray irradiation initiated polymerization. This strategy involves the design and tailoring of the surface of the nanoparticles and choice of the monomer as well as the selection of the polymerization route. The figure shows a TEM image of a bulk nanocomposite containing mercaptoethanol-capped ZnS with a particle content of 20,wt,%. [source] A Facile Route to Polysubstituted Naphthalenes and Benzofluorenols via Scandium Triflate- and Triflic Acid- Catalyzed Benzannulation of 2-(2-Alkynylarylidene)- 1,3-Dicarbonyl CompoundsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2010Lu Liu Abstract This paper describes an efficient scandium triflate- and triflic acid-catalyzed benzannulation of 2-(2-alkynylarylidene)-1,3-dicarbonyl compounds to afford polysubstituted naphthalenes and benzo[a]fluorenols. The product selectivity could be tuned by subtle choice of the catalyst. An unprecedented process between alkynes and ketones is also explored. [source] Hydrogenation of Phenol in Supercritical Carbon Dioxide Catalyzed by Palladium Supported on Al-MCM-41: A Facile Route for One-Pot Cyclohexanone FormationADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2009M. Chatterjee Abstract The hydrogenation of phenol has been carried out in supercritical carbon dioxide (scCO2) under very mild reaction conditions at the temperature of 50,°C over palladium supported Al-MCM-41 (metal loading ,1%). This palladium catalyst is shown to be highly active and promotes the selective formation of cyclohexanone (,98%), an industrially important compound, in a "one-pot" way. The effects of different variables like carbon dioxide and hydrogen pressure, reaction time and also silica/alumina ratio of the MCM-41 support along with palladium dispersion are presented and discussed. The pressure effect of carbon dioxide is significantly prominent in terms of conversion and cyclohexanone selectivity. Moreover, the silica/alumina ratio was also found to be an important parameter to enhance the effectiveness of the catalyst as it exhibits a remarkable increase in phenol conversion from 20.6% to 98.4% as the support changes from only silica MCM-41 to Al-MCM-41. A plausible mechanism for the hydrogenation of phenol to cyclohexanone over the palladium catalyst has been proposed. The proposition is validated by transition state calculations using density functional theory (DFT), which reveal that cyclohexanone is a favorable product and stabilized by <19,kcal,mol,1 over cyclohexanol in scCO2 medium. Under similar reaction conditions, phenol hydrogenation was also carried out with rhodium, supported on Al-MCM-41. In contrast to the palladium catalyst, a mixture of cyclohexanone (57.8%) and cyclohexanol (42.2%) was formed. Detailed characterization by X-ray diffraction and transmission electron microscopy confirmed the presence of metal nanoparticles (palladium and rhodium) between 10,20,nm. Both the catalysts exhibit strikingly different product distributions in solventless conditions compared to scCO2. This method can also be successfully applied to the other hydroxylated aromatic compounds. [source] Palladium-Catalysed Telomerisation of Isoprene with Glycerol and Polyethylene Glycol: A Facile Route to New Terpene DerivativesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 3 2009Alvaro Gordillo Abstract We present here the first example of the telomerisation of isoprene with glycerol and polyethylene glycol (PEG-200), opening a facile route to new terpene structures, based on a combination of renewable and petroleum-based feedstocks. The reaction is catalysed by a palladium-carbene complex. Significantly, this system gives >99% of linear monotelomer products. The factors that govern substrate conversion, dimerisation/telomerisation selectivity, and catalyst activity are studied and discussed. [source] Proton-Promoted Hydroamination of 3-Dialkylthiomethylene-1,4-pentadiynes with o -Phenylenediamines: A Facile Route to Benzo[b][1,4]diazepinesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2008Yu-Long Zhao Abstract The first proton-promoted intermolecular hydroamination reaction of the enynes, ,,,-dialkynylketene S,S -acetals 2, is described. A series of benzo[b][1,4]diazepines, with the structures of 3 and 5, were prepared chemo- and regioselectively in good to high yields by reacting the readily available 1,4-diynes 2 with both terminal and internal alkyne functions with o -phenylenediamines under very mild conditions. [source] A Facile Route to Synthesize the Ti5NbO14 Nanosheets by Mechanical Cleavage ProcessJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 2 2010Na Zhang Layered and rod-like K3Ti5NbO14 was synthesized via the solid-state chemistry, and it was exfoliated into nanosheets through a novel mechanical cleavage technology. X-ray diffraction was utilized to determine the phase changes of all the specimen during the total process, and the microstructure of the samples was analyzed by scanning electron microscope and transmission electron microscope. The formation mechanism was also discussed in detail, the results indicated that the compression and shearing should play a main function in the crack and the cleavage of the aggregated layered compound. UV,vis absorption spectroscopy was used to monitor the consecutive buildup of the (PEI/Ti5NbO14)n film. The resulting quasi-linear increase at the top absorbance as a function of the sequential assembly number for the multilayer film indicated that the nanosheet had deposited uniformly in each dipping cycle. The photocatalytic activity of K3Ti5NbO14 -related products was examined. Compared with original layered compound, nanosheet precipitate had good property under irradiation of ultraviolet light. [source] A Facile Route to Prepare Organic/Inorganic Hybrid Nanomaterials by ,Click Chemistry'MACROMOLECULAR RAPID COMMUNICATIONS, Issue 24 2009Xunyu Lu Abstract An organosilane with an alkyne group at the non-condensable end, [(2-propynylcarbamate)propyl]triethoxysilane, has been synthesized. Condensation of this organosilane with tetraethoxysilane can be achieved by a co-condensation strategy to produce silica nanoparticles with surface alkyne functionality. The size and uniformity of size distribution of the silica nanoparticles are influenced by varying the concentration of the added organosilane. The alkyne-functionalized silica nanoparticles are coupled directly with azide-modified polymers by ,click chemistry' to yield organic,inorganic hybrid nanomaterials. [source] ChemInform Abstract: Tandem Reactions of N,-(2-Alkynylbenzylidene)hydrazides with Silyl Enolates: A Facile Route to H-Pyrazolo[5,1-a]isoquinolines.CHEMINFORM, Issue 43 2010Xingxin Yu No abstract is available for this article. [source] ChemInform Abstract: A Facile Route to ,-Nitro Imidates via Four-Component Reaction of Alkynes with Sulfonyl Azides, Alcohols, and Nitroolefins.CHEMINFORM, Issue 38 2010Wangze Song No abstract is available for this article. [source] ChemInform Abstract: Novel Thermal and Microwave-Assisted Facile Route to Naphthalen-2(1H)-ones via an Oxidative Alkoxylation-Ring-Opening Protocol.CHEMINFORM, Issue 52 2009Chrysanthi Dolka 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 Facile Route to Aryl Boronates: Room-Temperature, Copper-Catalyzed Borylation of Aryl Halides with Alkoxy Diboron Reagents.CHEMINFORM, Issue 46 2009Christian Kleeberg 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: Facile Route to the Synthesis of New 2,3-Disubstituted Benzocoumarins.CHEMINFORM, Issue 45 2008Kamal M. El-Shaieb 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: Proton-Promoted Hydroamination of 3-Dialkylthiomethylene-1,4-pentadiynes with o-Phenylenediamines: A Facile Route to Benzo[b][1,4]diazepines.CHEMINFORM, Issue 43 2008Yu-Long Zhao 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] Hypervalent Iodine in the Synthesis of Bridgehead Heterocycles: A Facile Route to the Synthesis of 6-Arylimidazo[2,1-b]thiazoles Using [Hydroxy(tosyloxy)iodo]benzene.CHEMINFORM, Issue 35 2006Ranjana Aggarwal 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] A Green and Facile Route to ,- and ,-Lactones via Efficient Pinner-Cyclization of Hydroxynitriles in Water.CHEMINFORM, Issue 23 2006Karolina Aplander 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] BiCl3 -Mediated Opening of Epoxides, a Facile Route to Chlorohydrins or Amino Alcohols: One Reagent, Two Paths.CHEMINFORM, Issue 8 2006Adam McCluskey Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access the actual ChemInform Abstract, please click on HTML or PDF. [source] A New and Facile Route for the Synthesis of Thiocarbamates from Aniline, Carbon Monoxide, and Thiols Mediated by Selenium.CHEMINFORM, Issue 36 2005Xiaopeng Zhang No abstract is available for this article. [source] A Facile Route to Enaminones: Synthesis of 3-Alkyl/Aralkyl/Arylamino-1-arylprop-2-en-1-ones.CHEMINFORM, Issue 11 2005Milan Chandra Dutta Abstract For Abstract see ChemInform Abstract in Full Text. [source] Facile Route to Supramolecular Structures: Self-Assembly of Dendrimers and Naphthalene Dicarboxylic AcidsCHEMISTRY - A EUROPEAN JOURNAL, Issue 23 2008Franziska Gröhn Dr. Cylinders and spheres can be formed by simple self-assembly of cationic dendrimers and oppositely charged small divalent organic ions in methanol (see graphic). The counterion not only controls the morphology of the nanosized assembly, but also provides functionality, such as fluorescence. The concept may lead to versatile functional supramolecular architectures. [source] Novel Facile Routes for Synthesis and Isolation of Fluorofullerenes C60F18 and C60F20 Based on Commercially Available Fluorinating Reagents.CHEMINFORM, Issue 12 2006Pavel A. Troshin 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] Facile route for the synthesis of benzothiazoles and benzimidazoles in the presence of tungstophosphoric acid impregnated zirconium phosphate under solvent-free conditionsHETEROATOM CHEMISTRY, Issue 4 2009Hamid Aliyan Rapid and efficient condensation reactions of o -phenylenediamine and o -aminothiophenol with various aldehydes were carried out using tungstophosphoric acid impregnated zirconium phosphate in solvent-free conditions to afford the corresponding 2-substituted arylbenzimidazole and arylbenzothiazole derivatives in good to excellent yields. This procedure constitutes a simple and practical green synthetic method for 2-arylbenzimidazoles and 2-arylbenzothiazoles and their structural analogs. Furthermore, the catalyst can be reused for several times but it will be less active. © 2009 Wiley Periodicals, Inc. Heteroatom Chem 20:202,207, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20534 [source] Hydrothermal synthesis of nano-crystalline BaMoO4 under mild conditions using simple additiveCRYSTAL RESEARCH AND TECHNOLOGY, Issue 2 2010Guangru Tian Abstract Large-scale high-quality BaMoO4 nanocrystals have been synthesized in aqueous solutions under mild conditions with citrate as a simple additive. The crystals have bone-like, spindle-like and wheatear-like morphologies assembled from nanoparticles, nanofibers and have been characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques. The results showed that experimental parameters had great influences on the shape evolution of products. The adjustment of these parameters such as room temperature stirring time, reaction temperature and reaction time of hydrothermal reaction, can lead to obvious morphology changes of products, and the growth mechanism has been proposed. Room-temperature photoluminescence indicated that the as-prepared BaMoO4 nanocrystals had a strong blue emission peak at 481.5 nm. This facile route could be employed to synthesize more promising nanomaterials with interesting self-assembly structures. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Graphene Solution-Gated Field-Effect Transistor Array for Sensing ApplicationsADVANCED FUNCTIONAL MATERIALS, Issue 18 2010Markus Dankerl Abstract Graphene, with its unique combination of physical and electronic properties, holds great promise for biosensor and bioelectronic applications. In this respect, the development of graphene solution-gated field-effect transistor (SGFET) arrays capable of operation in aqueous environments will establish the real potential of graphene in this rapidly emerging field. Here, we report on a facile route for the scalable fabrication of such graphene transistor arrays and provide a comprehensive characterization of their operation in aqueous electrolytes. An on-chip structure for Hall-effect measurements allows the direct determination of charge carrier concentrations and mobilities under electrolyte gate control. The effect of the solution-gate potential on the electronic properties of graphene is explained using a model that considers the microscopic structure of water at the graphene/electrolyte interface. The graphene SGFETs exhibit a high transconductance and correspondingly high sensitivity, together with an effective gate noise as low as tens of ,V. Our study demonstrates that graphene SGFETs, with their facile technology, high transconductance, and low noise promise to far outperform state-of-the-art Si-based devices for biosensor and bioelectronic applications. [source] Printable Ferroelectric PVDF/PMMA Blend Films with Ultralow Roughness for Low Voltage Non-Volatile Polymer MemoryADVANCED FUNCTIONAL MATERIALS, Issue 17 2009Seok Ju Kang Abstract Here, a facile route to fabricate thin ferroelectric poly(vinylidene fluoride) (PVDF)/poly(methylmethacrylate) (PMMA) blend films with very low surface roughness based on spin-coating and subsequent melt-quenching is described. Amorphous PMMA in a blend film effectively retards the rapid crystallization of PVDF upon quenching, giving rise to a thin and flat ferroelectric film with nanometer scale , -type PVDF crystals. The still, flat interfaces of the blend film with metal electrode and/or an organic semi-conducting channel layer enable fabrication of a highly reliable ferroelectric capacitor and transistor memory unit operating at voltages as low as 15,V. For instance, with a TIPS-pentacene single crystal as an active semi-conducting layer, a flexible ferroelectric field effect transistor shows a clockwise I,V hysteresis with a drain current bistability of 103 and data retention time of more than 15,h at ±15,V gate voltage. Furthermore, the robust interfacial homogeneity of the ferroelectric film is highly beneficial for transfer printing in which arrays of metal/ferroelectric/metal micro-capacitors are developed over a large area with well defined edge sharpness. [source] Palladium-Catalysed Telomerisation of Isoprene with Glycerol and Polyethylene Glycol: A Facile Route to New Terpene DerivativesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 3 2009Alvaro Gordillo Abstract We present here the first example of the telomerisation of isoprene with glycerol and polyethylene glycol (PEG-200), opening a facile route to new terpene structures, based on a combination of renewable and petroleum-based feedstocks. The reaction is catalysed by a palladium-carbene complex. Significantly, this system gives >99% of linear monotelomer products. The factors that govern substrate conversion, dimerisation/telomerisation selectivity, and catalyst activity are studied and discussed. [source] Organocatalytic and Stereoselective [3 + 2] Cycloadditions of Azomethine Imines with ,,,-Unsaturated AldehydesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 14 2006Wei Chen Abstract Bipyrazolidin-3-one derivatives are biologically significant compounds and their importance has increased in the past decades. In this paper, the first stereoselective [3 + 2] dipolar cycloadditions of azomethine imines with ,,,-unsaturated aldehydes catalyzed by readily available ,,,-diarylprolinol salts are reported, providing a facile route to the synthesis of various chiral bipyrazolidin-3-one derivatives under mild conditions. The organocatalyst 1,g with strongly electron-withdrawing groups exhibited the best stereoselectivity (exo:endo up to 98:2, for exo product up to 97,% ee), in the combination with trifluoroacetic acid. [source] A facile route to the synthesis of 1,4-pyranonaphthoquinone derivatives under microwave irradiation without catalystJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 5 2009Xing-Han Wang A series of 1,4-pyranonaphthoquinone derivatives were synthesized via the reaction of arylidenemalononitrile and 2-hydroxynaphthalene-1,4-dione in the mixed solvent of N,N-dimethylformamide and glacial acetic acid (HOAc) under microwave irradiation without catalyst. This protocol has the notable advantages of short reaction time, high yield, and convenient operation. J. Heterocyclic Chem., (2009). [source] The deuteriation of constituents in olive oil and red wine with Nafion, a polymer supported acid catalystJOURNAL OF LABELLED COMPOUNDS AND RADIOPHARMACEUTICALS, Issue 14 2001Kellie L. Tuck Abstract A procedure for the deuteriation of a large range of aromatic compounds with phenolic and methoxy substituents has been developed using Nafion, a polymer supported acid catalyst. A range of compounds present in red wine and olive oil were deuteriated using these conditions. This procedure provides a facile route for the labelling of homovanillic alcohol, homovanillic acid, syringic acid, syringaldehyde and vanillin. This method is also applicable for the tritiation of these compounds. Copyright © 2001 John Wiley & Sons, Ltd. [source] | |||||||||||||