Facile Synthesis (facile + synthesis)

Distribution by Scientific Domains
Distribution within Chemistry


Selected Abstracts


ChemInform Abstract: Facile Syntheses of Three AHP-Type Building Blocks with Complementary Reactivities.

CHEMINFORM, Issue 40 2009
Wen Chen
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: Nickel-Catalyzed Oxidative Coupling Reactions of Two Different Terminal Alkynes Using O2 as the Oxidant at Room Temperature: Facile Syntheses of Unsymmetric 1,3-Diynes.

CHEMINFORM, Issue 25 2009
Weiyan Yin
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]


Facile Syntheses of Oxazolines and Thiazolines with N-Acylbenzotriazoles under Microwave Irradiation.

CHEMINFORM, Issue 25 2004
Alan R. Katritzky
Abstract For Abstract see ChemInform Abstract in Full Text. [source]


Facile Syntheses of Various Per- or Polyfluoroalkylated Internal Acetylene Derivatives.

CHEMINFORM, Issue 1 2004
Tsutomu Konno
Abstract For Abstract see ChemInform Abstract in Full Text. [source]


ChemInform Abstract: Facile Syntheses of New Cavitands with Mixed Substituents.

CHEMINFORM, Issue 5 2002
Manuela Flauaus
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]


Tandem Exploitation of Helix pomatia Glycosyltransferases: Facile Syntheses of H-Antigen-Bearing Oligosaccharides

CHEMISTRY - A EUROPEAN JOURNAL, Issue 25 2007
Hagen Bretting Prof.
Abstract Snails from the family Helicidae produce in their albumen glands a highly branched galactan, which consists almost exclusively of D - and L -galactose. The D -Gal residues are glycosydically ,(1,6)- or ,(1,3)-linked, whereas the L -Gal moieties are attached ,(1,2). Up until the present time, two ,(1,6)- D -galactosyl transferases and one ,(1,2)- L -galactosyl transferase have been identified in a membrane preparation of these glands. These were used to synthesise various oligosaccharides by successive addition of the NDP-activated (NDP=nucleoside-5,-diphosphate) D -Gal or L -Fuc moieties, up to a heptasaccharide by starting from the disaccharide D -Gal-,(1,3)- D -Gal-,(1,OMe. Even larger oligosaccharides up to a tridecasaccharide were obtained by starting with the hexasaccharide D -Gal-[,(1,3)- D -Gal]4 -,(1,4)- D -Glc as an acceptor substrate. This tandem exploitation process has high potential for the easy introduction of D -Gal and L -Fuc residues into a great variety of oligosaccharides, which can be used in ligand/acceptor studies. [source]


General and Facile Syntheses of Metal Silicate Porous Hollow Nanostructures

CHEMISTRY - AN ASIAN JOURNAL, Issue 6 2010
Jun Zheng
Abstract Porous hollow nanostructures have attracted intensive interest owing to their unique structure and promising applications in various fields. A facile hydrothermal synthesis has been developed to prepare porous hollow nanostructures of silicate materials through a sacrificial-templating process. The key factors, such as the concentration of the free metal cation and the alkalinity of the solution, are discussed. Porous hollow nanostructures of magnesium silicate, nickel silicate, and iron silicate have been successfully prepared by using SiO2 spheres as the template, as well as a silicon source. Several yolk,shell structures have also been fabricated by a similar process that uses silica-coated composite particles as a template. As-prepared mesoporous magnesium silicate hollow spheres showed an excellent ability to remove Pb2+ ions in water treatment owing to their large specific surface and unique structures. [source]


Rational, Facile Synthesis and Characterization of the Neutral Mixed-Metal Organometallic Oxides Cp*2MoxW6,xO17 (Cp* = C5Me5, x = 0, 2, 4, 6)

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 34 2009
Gülnur Taban-Çal
Abstract The reaction of the bis(pentamethylcyclopentadienyl)pentaoxidodimetal complexes Cp*2M2O5 with four equivalents of Na2M,O4 (M, M, = Mo, W) in acidic aqueous medium constitutes a soft and selective entry into neutral Lindqvist-type organometallic mixed-metal oxides Cp*2MoxW6,xO17 [x = 6 (1), 4 (2), 2 (3), 0 (4)]. The identity of the complexes is demonstrated by elemental analyses, thermogravimetric analyses and infrared spectroscopy. Thermal degradation of 1,4 up to above 500 °C leads to Mox/6W1,x/6O3. The molecular identity and geometry of compound 2 is further confirmed by a fit of the powder X-ray diffraction pattern with a model obtained from previously reported single-crystal X-ray structures of 1 and 4, with which 2 is isomorphous. DFT calculations on models obtained by replacing Cp* with Cp (I,IV) validate the structural assignments and assist in the assignment of the M,M,,O vibrations. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]


Facile Synthesis of Bastnaesite -Type LaF[CO3] and Its Thermal Decomposition to LaOF for Bulk and Eu3+ -Doped Samples

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 3 2009
Oliver Janka
Abstract Rare-earth metal(III) oxide fluorides with the composition MOF (M = La,Lu) seem to offer promising host lattices for luminescence applications by doping these materials with trivalent lanthanoid cations. Unfortunately, there was no simple and practicable way to synthesize the compounds in phase-pure quality with classical solid-state chemistry reactions. However, by using the rare-earth metal(III) fluoride oxocarbonates, MF[CO3], as solution-born precursor materials that crystallize with a bastnaesite -type structure, easy access is now possible by mild thermal decomposition. Synthetic details, investigations on the phase purity and the presence of the oxocarbonate anion [CO3]2, proved by IR measurements as well as from X-ray powder diffraction data are given in this paper for the example of bulk LaF[CO3] and Eu3+ -doped samples. The latter (LaF[CO3]:Eu3+) shows a bright orange-red luminescence that is stronger than that of the product of its thermal decomposition: trimorphic LaOF:Eu3+.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]


Facile Synthesis of Selenium-Containing Bicyclic ,-Lactams through Enyne Metathesis

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 14 2010
Deepali B. Bankar
Abstract Novel selenium-containing bicyclic ,-lactams were obtained through stereoselective insertion of (but-3-enyl)seleno and propargylseleno moieties at the C(4) positions of azetidinones with subsequent ring-closing enyne metathesis. [source]


A Facile Synthesis of Lentiginosine Analogues Based on a Highly Regio- and Diastereoselective Allylic Amination Using Chlorosulfonyl Isocyanate

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 8 2010
In Su Kim
Abstract The concise synthesis of the lentiginosine analogues pyrrolizidine alkaloid 2 and pyrroloazepine alkaloid 3 has been achieved from inexpensive and readily available D -lyxose. The key steps in the synthesis included regio- and diastereoselective amination, inter- or intramolecular olefin metathesis, and Appel cyclization. The anti -3,4-amino alcohol 6, essential for the preparation of the title compounds 2 and 3, was synthesized by the regio- and diastereoselective amination of anti -3,4-tribenzyl ether 7 using chlorosulfonyl isocyanate. The reaction of 7 with chlorosulfonyl isocyanate in toluene at 0 °C afforded 6 exclusively with a diastereoselectivity of 26:1 in 84,% yield. These results can be explained by the neighboring-group effect, which leads to retention of thestereochemistry. [source]


Facile Synthesis of Flexible Bis(pyrazol-1-yl)alkane and Related Ligands in a Superbasic Medium

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 30 2007
Andrei S. Potapov
Abstract Flexible ligands 1,3-bis(pyrazol-1-yl)propanes, bis[2-(pyrazol-1-yl)ethyl] ethers, and bis[2-(3,5-dimethylpyrazol-1-yl)ethyl]amine were prepared by a facile procedure involving the reaction of pyrazoles with 1,3-dibromopropane, bis(2-chloroethyl) ether or bis(2-chloroethyl)amine hydrochloride in a superbasic medium (dimethyl sulfoxide/potassium hydroxide). Reaction of bis(2-chloroethyl)amine and pyrazole unexpectedly led to 1,4-bis[2-(pyrazol-1-yl)ethyl]piperazine. The corresponding 4,4,-diiodo-substituted bis(pyrazole) derivatives were prepared by oxidative iodination with I2/HIO3/H2SO4 in acetic acid. Vilsmeier,Haak formylation of some of the prepared compounds yielded the corresponding dialdehydes.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]


Hierarchical ZnS-In2S3 -CuS Nanospheres with Nanoporous Structure: Facile Synthesis, Growth Mechanism, and Excellent Photocatalytic Activity

ADVANCED FUNCTIONAL MATERIALS, Issue 19 2010
Yingxuan Li
Abstract Without using any templates or surfactants, hierarchical ZnS-In2S3 -CuS nanospheres with nanoporous structure are successfully synthesized via a simple and convenient process. The nanospheres are aggregations of densely packed nanoparticles and nanorods. Different to the oriented attachment (OA) mechanism reported in the literature, the formation of these nanorods is believed to follow a lateral OA mechanism (nanoparticles attach along the direction perpendicular to the crystallographic axes with lateral planes as the juncture) based on the experimental data. This process could be a general phenomenon and would provide a new insight into the OA mechanism. A detailed time-resolved TEM kinetic study of the formation of the complex structure is shown. The dipole mechanism and electric field-induced growth are found to be responsible for the final architecture. Photocatalytic activities for water splitting are investigated under visible-light irradiation (, > 400 nm) and an especially high photocatalytic activity (apparent yield of 22.6% at 420 nm) is achieved by unloaded ZnIn0.25Cu0.02S1.395 prepared at 180 °C for 18 h because of their high crystallinity, large pore volume, and the presence of nanorods with special microstructures. [source]


A Facile Synthesis and Characterization of Monodisperse Spherical Pigment Particles with a Core/Shell Structure,

ADVANCED FUNCTIONAL MATERIALS, Issue 9 2007
C. Lin
Abstract In this paper, a facile sol,gel process for producing monodisperse, spherical, and nonaggregated pigment particles with a core/shell structure is reported. Spherical silica particles (245 and 385,nm in diameter) and Cr2O3, ,-Fe2O3, ZnCo2O4, CuFeCrO4, MgFe2O4, and CoAl2O4 pigments are selected as cores and shells, respectively. The obtained core/shell-structured pigment samples, denoted as SiO2@Cr2O3 (green), SiO2@,-Fe2O3 (red), SiO2@MgFe2O4 (brown), SiO2@ZnCo2O4 (dark green), SiO2@CoAl2O4 (blue), and SiO2@CuFeCrO4 (black), are well characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and UV-vis diffuse reflection, as well as by investigating the magnetic properties. The results of XRD and high-resolution TEM (HRTEM) demonstrate that the pigment shells crystallize well on the surface of SiO2 particles. The thickness of the pigment shell can be tuned by the number of coatings, to some extent. These pigment particles can be well dispersed in some solvents (such as glycol) to form relatively more stable suspensions than the commercial products. Apart from the color characteristics, some of pigments like SiO2@Cr2O3, SiO2@MgFe2O4, and SiO2@CuFeCrO4 also show magnetic properties with coercivities of 1098,Oe (5,K), 648,Oe (5,K), and 91,Oe (298,K), respectively. [source]


Facile Synthesis of Diastereoisomerically and Optically Pure 2-Substituted Hexahydro-1H -pyrrolizin-3-ones

HELVETICA CHIMICA ACTA, Issue 8 2005
Romain Siegrist
We report a short synthetic route that provides optically active 2-substituted hexahydro-1H -pyrrolizin-3-ones in four steps from commercially available Boc (tert -but(oxy)carbonyl))-protected proline. Diastereoisomers (,)- 11 and (,)- 12 were assembled from the proline-derived aldehyde (,)- 8 and ylide 9via a Wittig reaction and subsequent catalytic hydrogenation (Scheme,3). Cleavage of the Boc protecting group under acidic conditions, followed by intramolecular cyclization, afforded the desired hexahydro-1H -pyrrolizinones (,)- 1 and (+)- 13. Applying the same protocol to ylide 19 afforded hexahydro-1H -pyrrolizinones (,)- 25 and (,)- 26 (Scheme,5). The absolute configuration of the target compounds was determined by a combination of NMR studies (Figs.,1 and 2) and X-ray crystallographic analysis (Fig.,3). [source]


Nonclassical Crystallization: Facile Synthesis and Shape Evolution of Single-Crystal Cuprous Oxide (Adv. Mater.

ADVANCED MATERIALS, Issue 20 2009
20/2009)
Lian Gao and co-workers discuss on p. 2068 the synergic effect of oriented attachment and ripening mechanism with face-selective additive adsorption for the formation of various morphologies of single-crystal Cu2O. The frontispiece shows an SEM image of self-assembled microcubic Cu2O mesocrystals, clearly revealing the rarely observed combination of a nonclassical-particle-based crystallization process and subsequent classical crystallization process. [source]


Facile Synthesis and Shape Evolution of Single-Crystal Cuprous Oxide

ADVANCED MATERIALS, Issue 20 2009
Xudong Liang
Various morphologies of single-crystal Cu2O such as cube, octahedron, {110} truncated octahedron, and microrhombic dodecahedron with {110} surfaces are prepared in high yield through a facile solution-based one-step reduction method in an alkaline H2O/ethanol/oleic acid system in the presence of d-(+)-glucose. The formation mechanism of these microcrystals has been clarified as the synergic effect of oriented attachment and ripening mechanism. [source]


Facile Synthesis of Fe2O3 Nanocrystals without Fe(CO)5 Precursor and One-Pot Synthesis of Highly Fluorescent Fe2O3,CdSe Nanocomposites

ADVANCED MATERIALS, Issue 8 2009
Chung Yen Ang
,-Fe2O3 nanocrystals are synthesized in high yield (2,g) without a hazardous precursor and with a less-expensive oxidant in a one-pot synthesis (see figure). Bifunctional magnetic quantum-dot (, -Fe2O3,CdSe) nanocomposites are also synthesized in high yield, with a photoluminescence quantum yield of up to 42%. [source]


GaN Nanofibers based on Electrospinning: Facile Synthesis, Controlled Assembly, Precise Doping, and Application as High Performance UV Photodetector,

ADVANCED MATERIALS, Issue 2 2009
Hui Wu
Nitride nanofibers have been synthesized based on a simple electrospinning technique for the first time. No catalysts or templates are needed in this new synthetic method. Highly oriented GaN nanofiber arrays, as well as a high-performance UV photodetector based on single GaN nanofiber assembled FET devices, can be facilely fabricated using this technique. Precise doping of other elements into the GaN nanofibers is easy by this solution-based synthetic method. [source]


Facile Synthesis of New Full-Color-Emitting BCNO Phosphors with High Quantum Efficiency,

ADVANCED MATERIALS, Issue 17 2008
Takashi Ogi
A novel full-color-emitting phosphor composed of B, C, N, and O atoms is prepared by a one-step solution process from inexpensive precursors at ambient atmosphere and relatively low temperatures (below 900,°C). Emission from this novel phosphor can be tuned from the violet to the near-red, as illustrated in the figure, simply by varying the carbon content in the samples. [source]


Facile Synthesis and Characterization of Luminescent TiO2 Nanocrystals,

ADVANCED MATERIALS, Issue 16 2005
D. Pan
A simple, two-phase approach using an autoclave is taken to synthesize high-quality anatase TiO2 nanocrystals with a narrow size distribution (see Figure). The size-tunable luminescence of the TiO2 nanocrystals is dominated by band-edge luminescence at room temperature. The nanocrystals could be readily dispersed in toluene after capping with stearic or oleic acid. [source]


The Combination of Colloid-Controlled Heterogeneous Nucleation and Polymer-Controlled Crystallization: Facile Synthesis of Separated, Uniform High-Aspect-Ratio Single-Crystalline BaCrO4 Nanofibers

ADVANCED MATERIALS, Issue 2 2003
S.-H. Yu
Uniform, separated BaCrO4 single-crystalline nanofibers with high aspect ratio (>,5000, see Figure) can be fabricated at room temperature in aqueous solution using a double hydrophilic block copolymer as structure-directing agent and introducing colloidal nucleation agents. Such fibers represent a model case for advanced polymer fillers and the exploration of quasi-1D nanostructures with interesting electrical, optical, or catalytic properties. [source]


Facile Synthesis of Polycyclic Fluorene Derivatives via a Palladium-Catalyzed Coupling, Propargyl-Allenyl Isomerization and Schmittel Cyclization Sequence

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 17 2009
Ruwei Shen
Abstract A stepwise process involving Sonogashira coupling, propargyl-allenyl isomerization and Schmittel cyclization has been realized, leading to an efficient synthesis of polycyclic fluorene derivatives from readily available starting materials. The reaction features the formation of three new carbon-carbon bonds to construct the benzene unit together with an efficient assembly of three or four rings in a single operative step. [source]


Facile Synthesis of Enantiopure 4-Substituted 2-Hydroxy-4- butyrolactones using a Robust Fusarium Lactonase

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 17 2009
Bing Chen
Abstract A facile chemo-enzymatic process has been developed for producing stereoisomers of 4-substituted 2-hydroxy-4-butyrolactones with good to excellent enantioselectivity. This process involves an easy separation of the diastereoisomers by column chromatography and efficient enzymatic resolution by whole cells of Escherichia coli JM109 expressing Fusarium proliferatum lactonase gene. This biocatalyst shows strong tolerance towards different substrate structures and at least three out four possible isomers could be obtained in excellent enantiomeric purity. Different substrate concentrations (10,mM,200,mM) were examined, giving a substrate to catalyst ratio of up to 26:1. This general and efficient enzymatic process provides access to stereoisomers of 4-substituted 2-hydroxy-4-butyrolactones readily and cost-effectively. The stereochemical assignments were conducted systematically based on NMR, X-ray diffraction and circular dichroism, leading to further understanding of the enzyme's stereoselectivity. [source]


Silica Supported Sodium Hydrogen Sulfate and Amberlyst-15: Two Efficient Heterogeneous Catalysts for Facile Synthesis of Bis- and Tris(1H -indol-3-yl)methanes from Indoles and Carbonyl Compounds[1]

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 5 2003
Chimmani Ramesh
Abstract Bis- and tris(1H -indol-3-yl)methanes are synthesized in high yields by an electrophilic substitution reaction of indoles with carbonyl compounds under mild reaction conditions using two efficient heterogeneous catalysts, silica supported sodium hydrogen sulfate (NaHSO4,SiO2) and amberlyst-15. The second catalyst can be reused. [source]


Facile Synthesis of Spherical Polyelectrolyte Brushes as Carriers for Conducting Polymers to be Used in Plastic Electronics

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 18 2009
Jianjun Wang
Abstract A two-step method for the preparation of spherical polyelectrolyte brushes (SPBs) has been developed. Copolymerization of styrene and divinyl benzene at the particle surface resulted in a large number of accessible vinyl groups. These vinyl groups reacted with sodium styrene sulfonate to give SPBs. The SPBs were used as carriers for conducting polymers resulting in redispersible conducting inks with good film forming properties. Direct current (DC) conductivity of the polypyrrole (PPy) loaded samples showed a percolating behavior as probed by impedance spectroscopy. Finally, device performance of organic light-emitting diodes based on the conducting thin films assembled from the PPy loaded particles was tested. [source]


Facile Synthesis of Polyaniline-Polypyrrole Nanofibers for Application in Chemical Deposition of Metal Nanoparticles

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 16 2008
Ping Xu
Abstract Polyaniline-polypyrrole (PANI-PPy) nanofibers with high aspect ratios have been synthesized by a one-step, surfactant-assisted chemical oxidative polymerization from mixtures of aniline (An) and pyrrole (Py) monomers. PANI-PPy nanofibers synthesized with an excess of either PANI or PPy show similar spectral (UV-vis and FT-IR) characteristics as the individual homopolymers, whereas nanofibers from an equimolar mixture of An and Py display unique spectral characteristics. PANI-PPy nanofibers undergo a spontaneous redox reaction with metal ions to produce metal nanoparticles with various morphologies and/or sizes. These findings may open new opportunities for synthesizing functional polymer nanofibers and metal nanoparticles with controllable sizes and/or morphologies. [source]


Facile Synthesis of Copper(II)Immobilized on Magnetic Mesoporous Silica Microspheres for Selective Enrichment of Peptides for Mass Spectrometry Analysis,

ANGEWANDTE CHEMIE, Issue 41 2010
Shasha Liu
Fesselnde Poren: Kupferionen wurden in den senkrechten Kanälen einer mesoporösen SiO2 -Schale um einen Fe3O4 -Kern immobilisiert. Dank der gut zugänglichen Mesoporen, der großen Porenoberfläche und der großen Menge an Cu2+ -Ionen in den Kanälen gelingt der selektive Einfang von hydrophoben und hydrophilen Peptiden aus komplexen biologischen Proben mit anschließender magnetischer Abtrennung und MS-Analyse (siehe Bild). [source]


Facile Synthesis of Isomerically Pure Fullerenols and Formation of Spherical Aggregates from C60(OH)8,

ANGEWANDTE CHEMIE, Issue 31 2010
Gang Zhang
Das Octahydroxyfulleren C60(OH)8 (siehe Bild) gehört zu einer Gruppe von isomerenreinen Fullerenolen mit zwei bis acht OH-Gruppen, die durch selektive Umwandlung von tert -Butylperoxogruppen in Peroxofullerenen hergestellt wurden. Weil alle OH-Gruppen auf der gleichen Kugelhälfte liegen, ist C60(OH)8 amphiphil und bildet stabile sphärische Aggregate in Wasser. [source]


Facile Synthesis of Five-fold Twinned, Starfish-like Rhodium Nanocrystals by Eliminating Oxidative Etching with a Chloride-Free Precursor,

ANGEWANDTE CHEMIE, Issue 31 2010
Hui Zhang Dr.
Fünffach verzwillingte, Seestern-förmige Rh-Nanokristalle mit fünf Armen (siehe TEM-Bild) wurden in hohen Ausbeuten ausgehend von [{Rh(CF3COO)2}2] synthetisiert. Die Synthese vermeidet oxidative Ätzvorgänge, und die frisch hergestellten Rh-Nanokristalle eignen sich sehr gut als SERS-Substrate. [source]