Home About us Contact
|
Home About us Contact | ||
|
|
||
Simple Synthesis (simple + synthesis)
Selected AbstractsA Simple Synthesis of Functionalized 3-Bromocoumarins by a One-Pot Three-Component ReactionEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 6 2010Davide Audisio Abstract Functionalized 3-bromocoumarins 2 have been prepared by a simple one-pot bromination/Wittig/cyclization tandem process from methyl (triphenylphosphoranylidene)acetate, N -bromosuccinimide and a series of 2-hydroxybenzaldehydes. Owing to the commercial availability of salicylaldehyde derivatives, this approach offers such a diverse range of compounds that it fulfills the recent demand for the generation of large combinatorial chemical libraries based on the coumarin scaffold. [source] N -Phenyl-1,2,4-triazoline-3,5-dione (PTAD) as a Dienophilic Dinitrogen Equivalent: A Simple Synthesis of 3-Amino-1,2,4-benzotriazines from Arylcarbodiimides,EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 4 2010Mateo Alajarin Abstract N -Arylcarbodiimides react with PTAD to provide [1,2,4]triazolo[1,2- a][1,2,4]benzotriazines by a [4+2] cycloaddition reaction. When asymmetrically substituted diarylcarbodiimides are used, the cycloaddition proceeds with total chemoselectivity because only the more electron-rich aryl nucleus is involved. This observation has been rationalized by a computational study using DFT methods that shows that, in the reaction of HTAD with arylcarbodiimides, the magnitude of the energy barriers depend on the electronic features of the substituents at the aryl nucleus; the calculations also indicate that the reaction proceeds through asynchronous states with polar characteristics. The treatment of the final cycloadducts with potassium hydroxide affords 3-aryl(alkyl)amino-1,2,4-benzotriazines. [source] Organocatalytic Enantioselective Michael Addition of 4-Hydroxycoumarin to ,,,-Unsaturated Ketones: A Simple Synthesis of WarfarinEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 30 2009Zhenhua Dong Abstract A type of C2 -symmetric secondary amine amide catalysts were developed for the asymmetric Michael addition of 4-hydroxycoumarin to ,,,-unsaturated ketones. A series of important biologically and pharmaceutically active compounds were obtained in excellent yields (up to 99,%) with high enantioselectivities (up to 89,%,ee) under mild conditions. In addition, enantiopure product could be obtained by a single recrystallization. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Tris(4-cyanophenyl)amine: Simple Synthesis via Self-assembly; Strong Fluorescence in Solution, Nano/microcrystals, and Solid,ADVANCED FUNCTIONAL MATERIALS, Issue 13 2007A. Patra Abstract The threefold symmetric molecule, tris(4-cyanophenyl)amine (TCPA) is synthesized from 4-fluorocyanobenzene by treatment with potassium carbonate in dimethylsulfoxide; the occurrence of the reaction without any amine reagent suggests the involvement of a novel self-assembly process. A reprecipitation strategy provides stable colloids containing highly monodisperse nano/microcrystals with well-defined cubic morphology and sizes tunable from 250 to 500,nm. The solution, colloid, and solid states of TCPA exhibit strong blue fluorescence; the colloid shows dual emission with an unusually small Stokes shift. Computational investigations are carried out on the molecule and supramolecular assemblies derived from the crystal structure. Coupled with detailed spectroscopic studies, they show that the emission in the colloidal and solid states can be attributed to energy levels resulting from the intermolecular interactions within different aggregation motifs in the condensed phase and energy cascades between them. The computations also reveal the presence of cooperative interactions in the molecular crystal contributing to its high thermal stability. The strong light emission exhibited by TCPA, concurrently in the solution, nano/microcrystal, and solid states establishes it as a novel molecular material of potential practical utility; it has led to the exploration of the underlying mechanism that describes the phenomena observed in the different physical states. [source] Simple Synthesis of Submicrometer Lead Titanate Powder by Precipitation of TiO2 Precursor on PbO ParticulatesJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 4 2000Kyoung R. Han A simple way to prepare phase-pure, submicrometer PbTiO3 powder was tried by precipitation. Precipitation was carried out in an aqueous PbO slurry using aqueous TiCl4 and dilute NH4OH at pH 9.5 ± 0.1. The TG/DSC curves of the PT precursor show weight loss of ,7% and two exotherms at 492° and 522°C. They are attributed to the crystallization of tetragonal PbTiO3. XRD shows that tetragonal PbTiO3 can be obtained by heat treatment around 500°C via a noncrystalline state. SEM shows that the PbTiO3 powder calcined at 600°C for 1 h is well crystallized and in the range of 100,300 nm. [source] Simple Synthesis of Graphitic Ordered Mesoporous Carbon Materials by a Solid-State Method Using Metal Phthalocyanines,ANGEWANDTE CHEMIE, Issue 31 2009Tae Lee Dr. Kohlenstoff-Vorstufen in Form von Metallphthalocyaninen führen dazu, dass bei einer Pseudo-Festkörper-in-situ-CVD auf mesoporösem Silicat hoch graphitische mesoporöse Kohlenstoffmaterialien (siehe TEM-Bild) mit geordneter Porenstruktur, großer Oberfläche und großem Porenvolumen entstehen. Dieser einfache Syntheseansatz eignet sich für die Produktion größerer Mengen, und die Graphitisierung wird durch die katalytische Wirkung des Metalls verstärkt. [source] ChemInform Abstract: A Simple Synthesis and Room Temperature Magnetic Properties of New Binary Mn0.5Fe0.5 (H2PO4)2·xH2O Obtained from a Rapid Co-Precipitation at Ambient Temperature.CHEMINFORM, Issue 19 2009Banjong Boonchom 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: Simple Synthesis of Highly Functionalized Ketenimines.CHEMINFORM, Issue 49 2008Mohammad Bayat 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 Synthesis of ,-Nitro-,-keto Nitrile.CHEMINFORM, Issue 26 2008Nagatoshi Nishiwaki 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 Novel and Simple Synthesis of 9H-Pyrimido[4,5-b]indoles (III) under Microwave Irradiation and Solvent-Free Conditions.CHEMINFORM, Issue 22 2008Mehdi Adib 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] Simple Synthesis of 2-C-Branched Glycoacetic Acids.CHEMINFORM, Issue 46 2007Jian 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, please click on HTML or PDF. [source] A Simple Synthesis of Furo[3,,4,:5,6]pyrido[2,3-d]pyrimidine Derivatives Through Multicomponent Reactions in Water.CHEMINFORM, Issue 28 2007Shu-Jiang Tu 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] Transformations of 2-(,-Furyl)-4-(2-oxopyrrolidinyl-1)-1,2,3,4-tetrahydroquinolines, Cycloadducts of the Imino Diels,Alder Reaction: A Simple Synthesis of New Quinoline Derivatives.CHEMINFORM, Issue 15 2007Vladimir V. Kouznetsov 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 Novel Three-Component Reaction of Anilines, Formaldehyde and ,-Diketones: Simple Synthesis of 3-Spirosubstituted 1,2,3,4-Tetrahydroquinolines (IV).CHEMINFORM, Issue 15 2007Aliaksei P. Kadutskii 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 Simple Synthesis of ,-Methyl-,-keto Acids.CHEMINFORM, Issue 9 2007B. V. Pawar 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 Simple Synthesis of 3-Aryl-1H-pyrazoles.CHEMINFORM, Issue 42 2006Anne-Laure Gerard 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] Simple Synthesis of Geminal Diacetates (Acylals) of Aromatic Aldehydes.CHEMINFORM, Issue 36 2006Motiur A. F. M. Rahman 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 Simple Synthesis of 4H-1,3-Benzodioxin-2-one Derivatives by Iodocyclization of t-Butyl o-Vinylphenyl Carbonate Derivatives.CHEMINFORM, Issue 30 2006Kazuhiro Kobayashi 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 Clean and Simple Synthesis of 6-Amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano [2,3-c]pyrazole in Water.CHEMINFORM, Issue 27 2005Tong-Shou Jin Abstract For Abstract see ChemInform Abstract in Full Text. [source] Chemoselective Allylation of Aldehydes Using Cerium(III) Chloride: Simple Synthesis of Homoallylic Alcohols.CHEMINFORM, Issue 23 2005J. S. Yadav Abstract For Abstract see ChemInform Abstract in Full Text. [source] Zeolite-Catalyzed Simple Synthesis of Different Heterocyclic Rings.CHEMINFORM, Issue 4 2005Part 2. Abstract For Abstract see ChemInform Abstract in Full Text. [source] Highly Selective and Simple Synthesis of C2m,X,C2n Fullerene Dimers.CHEMINFORM, Issue 49 2004Yuliang Zhao No abstract is available for this article. [source] Rhodium(II)-Catalyzed Addition of 2-Diazo(fluoroalkyl)acetoacetates to Sulfides: A Simple Synthesis of Stable Sulfonium Ylides.CHEMINFORM, Issue 45 2004Shizheng Zhu Abstract For Abstract see ChemInform Abstract in Full Text. [source] Simple Synthesis of Tetrabutylammonium and Potassium Salts of Difluorotriorganostannate and Silicate Anions.CHEMINFORM, Issue 26 2004Robert Bujok Abstract For Abstract see ChemInform Abstract in Full Text. [source] Simple Synthesis of 1,2-Dihydro-5,6-tri(tetra)methylenespiro(cyclopentane (cyclohexane)-2-thieno-[2,3-d]pyrimidine-4(3H)-thiones).CHEMINFORM, Issue 18 2004V. D. Dyachenko Abstract For Abstract see ChemInform Abstract in Full Text. [source] Solid Phase Reduction of Oxazolones Using BER-Ni2B , A Simple Synthesis of N-Benzoylphenylalanines.CHEMINFORM, Issue 8 2004Atul P. Sikdar No abstract is available for this article. [source] A Simple Synthesis of Brominated Analogues of 3-Chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone (MX).CHEMINFORM, Issue 52 2003Keith W. Lumbard Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Simple Synthesis of B-2-(1-Trimethylsilyl-1-alkyl)-1,3,2-dioxaborinanes.CHEMINFORM, Issue 49 2003Isolation, Selective Oxidation to 1-Trimethylsilyl-1-alkanols. Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: A Simple Synthesis of 1-Aryl-polyenes.CHEMINFORM, Issue 32 2002Elena Pini 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: Simple Synthesis of 1a,7b-Dihydrocyclopropa[c]chromene Derivatives.CHEMINFORM, Issue 32 2002V. V. Shchepin 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] | ||||||||||||||||||||||||||||