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Versatile Route (versatile + route)
Selected AbstractsEtching and Dimerization: A Simple and Versatile Route to Dimers of Silver Nanospheres with a Range of Sizes,ANGEWANDTE CHEMIE, Issue 1 2010Weiyang Li Paarbildung: Dimere von Ag-Nanokugeln unterschiedlicher Größe entstehen durch das Ätzen von Ag-Nanowürfeln mit Eisen(III)-nitrat in Ethanol in Gegenwart von Poly(vinylpyrrolidon) (PVP). Diese wohldefinierten Dimere (siehe TEM-Aufnahme) ermöglichen das systematische Studium des Hot-Spot-Phänomens bei der oberflächenverstärkten Raman-Streuung (SERS). [source] ChemInform Abstract: The Sequential Sonogashira,Click Reaction: A Versatile Route to 4-Aryl-1,2,3-triazoles.CHEMINFORM, Issue 11 2010Krisztian Loerincz 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: Pd(0)-Catalyzed Intramolecular Heck Reaction: A Versatile Route for the Synthesis of Dibenzoazocinone Derivatives.CHEMINFORM, Issue 49 2009K. C. Majumdar 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: Pd(0) Catalyzed Intramolecular Heck Reaction: A Versatile Route for the Synthesis of 2-Aryl Substituted 5-, 6-, and 7-Membered O-Containing Heterocycles.CHEMINFORM, Issue 13 2009Shubhankar Samanta 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 and Versatile Route to the Synthesis of Fused 2-Pyridones: Useful Intermediates for Polycyclic Systems.CHEMINFORM, Issue 36 2006Barbara Cacciari 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] Partial Reduction of Pyridinium Salts as a Versatile Route to Dihydropyridones.CHEMINFORM, Issue 24 2005Timothy J. Donohoe Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Convergent, Versatile Route to Two Synthetic Conjugate anti-Toxin Malaria Vaccines.CHEMINFORM, Issue 47 2004Peter H. Seeberger No abstract is available for this article. [source] Short and Versatile Route to a Key Intermediate for Lactacystin Synthesis.CHEMINFORM, Issue 24 2003Philip C. Bulman Page Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Versatile Route to N,N,-(Peraryl)substituted 5,5,-Diamino-2,2,-bithiophenes.CHEMINFORM, Issue 11 2003Peter Gerstner Abstract For Abstract see ChemInform Abstract in Full Text. [source] Isoquinolinone Synthesis by SNAr Reaction: A Versatile Route to Imidazo[4,5-h]isoquinolin-9-ones.CHEMINFORM, Issue 4 2003Roger J. Snow Abstract For Abstract see ChemInform Abstract in Full Text. [source] Organocatalytic Multicomponent ,-Methylenation/Diels,Alder Reactions: A Versatile Route to Substituted Cyclohexenecarbaldehyde DerivativesCHEMISTRY - A EUROPEAN JOURNAL, Issue 17 2008Yue Zou Abstract This article describes the design and optimization of an effective organocatalytic three-component domino ,-methylenation/Diels,Alder reaction to produce vinyl-substituted cyclohexenecarboxaldehydes in a highly regioselective fashion. In these one-pot transformations, 2-formyl-1,3-butadienes (4) were prepared in situ from ,,,-unsaturated aldehydes and formalin and were subsequently trapped with a variety of buta-1,3-dienes. The outcomes of the reactions were dependent on the electronic properties of the dienes. 1-Vinylcyclohexenecarbaldehydes 6 were formed by use of acyclic electron-rich dienes, while the initially formed cycloadducts of 4 with cyclopentadiene underwent Cope rearrangements, leading to the formation of tetrahydro-3H -indene-5-carbaldehyde compounds 7. The mechanisms involved in these reactions were deduced from experimental findings. Furthermore, the method was also extended to one-pot domino methylenation/Diels,Alder reactions of dihydrofurans and dihydropyrans to yield spirocyclic lactols 22. In these reactions, the unstable intermediate hydroxyethyl and hydroxypropyl acroleins behaved as dienophiles, undergoing cycloaddition reactions with dienes with good yields and selectivities. The wide variety of functionalized 1-vinylcyclohex-3-enecarbaldehydes 6, 4-vinylcyclohex-1-enecarbaldehydes 7, and spiro lactols 22 generated through the use of these organocatalytic domino processes as a diversity-oriented synthesis provided useful intermediates for the construction of novel odorants. [source] Selective Oxidation of Acetophenones Bearing Various Functional Groups to Benzoic Acid Derivatives with Molecular OxygenADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2009Ryota Nakamura Abstract Acetophenones substituted by alkyl, alkoxy, acetoxy, and halogen groups were selectively oxidized with molecular oxygen to the corresponding benzoic acids by using the N,N,,N,, -trihydroxyisocyanuric acid (THICA)/cobalt(II) acetate [Co(OAc)2] and THICA/Co(OAc)2/manganese(II) acetate [Mn(OAc)2]. For example, 4-methylacetophenone was selectively oxidized with molecular oxygen to 4-acetylbenzoic acid (85%) by THICA/Co(OAc)2 and to 4-methylbenzoic acid (93%) by Mn(OAc)2, while terephthalic acid was obtained in 93% with the THICA/Co(OAc)2/Mn(OAc)2 catalytic system. It is interesting that the acetyl group on the aromatic ring is efficiently converted by a very small amount of Mn(OAc)2 to the corresponding carboxylic acid, and that the present method provides a versatile route to acetylbenzoic acids which are difficult to prepare by conventional methods. [source] Synthesis and characterization of stimuli-sensitive micro- and nanohydrogels based on photocrosslinkable poly(dimethylaminoethyl methacrylate)JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 4 2007Smrati Gupta Abstract The aim of this work was the development of a versatile route for the preparation of temperature- and pH-responsive hydrogels with small dimensions. The copolymerization of N,N -dimethylaminoethyl methacrylate with various amounts (5 and 10 mol %) of dimethylmaleimidoethyl methacrylate in solution with 2,2,-azobisisobutyronitrile as an initiator is described. The structural and molecular characterization of the copolymers was performed with proton nuclear magnetic resonance, Fourier transform infrared, and ultraviolet spectroscopy, as well as size exclusion chromatography. Differential scanning calorimetry and thermogravimetry were used for the thermal characterization of the copolymers. Micro- and nanohydrogels of the copolymers were prepared by photocrosslinking. The gels obtained by photocrosslinking were characterized with a combination of surface plasmon resonance and optical waveguide spectroscopy, dynamic light scattering, and scanning electron microscopy. The hydrogels showed temperature- and pH-responsive behavior. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 669,679, 2007 [source] Cobalt(II) octanoate and cobalt(II) perfluorooctanoate catalyzed atom transfer radical polymerization of styrene in toluene and fluorous media,A versatile route to catalyst recycling and oligomer formationJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 17 2005Marc-Stephan Weiser Abstract Cobalt(II) perfluorooctanoate-catalyzed atom transfer radical polymerization (ATRP) and reverse ATRP were developed to prepare oligostyrenes (Mn < 2500) with low polydispersities Mw/Mn < 1.5. Fluorous biphase catalysis was applied for effective recycling of catalyst and fluorous solvent. The homogeneous polymerization reaction was performed at 90 °C in toluene/cyclohexane/perfluorodecalin mixture (1:1:1) and fluorine-free solvents. Temperature-induced phase separation of this fluorous solvent mixture occurred at room temperature and proved to be the key for the very effective separation of the cobalt(II) perfluorooctanoate from the oligostyrene and fluorine-free solvents. Both the fluorine-tagged cobalt catalysts and the fluorous media were recycled and reused up to three times without encountering catalyst activity losses. The roles of cobalt catalysts, fluorous media, and monomer/initiator ratio were examined with respect to the polymerization kinetics. Fluorine-containing and fluorine-free cobalt(II) octanoate catalyzed controlled styrene oligomerization according to the ATRP mechanism. The molar mass control range was limited in fluorous biphase catalysis most likely because of precipitation of high molar mass polystyrenes in the fluorous reaction medium. To the best of our knowledge, this is the first time temperature-induced phase separation of fluorous and fluorine-free solvents has been successfully applied to polymerization processing. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 3804,3813, 2005 [source] | ||||||||||||||||||||||