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Condensation Products (condensation + products)
Selected AbstractsSynthesis of 1-Phenyl-1,2-cyclohexadiene and 1-(2-Bromocyclohex-2-en-1-yl)benzene and Wurtz-Like Condensation Products in the Reaction of 1-(2,3-Dibromocyclohex-1-en-1-yl) Benzene with Zinc.CHEMINFORM, Issue 6 2003Mustafa Ceylan Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Synthesis and Nitration of Condensation Products of Sulfamates with Aliphatic Amines and Formaldehyde.CHEMINFORM, Issue 1 2001V. A. Tartakovsky 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] Synthesis of meso -tetra acid and ester functionalized calix[4]pyrrolesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 5 2005Ahmet Akar Novel meso -tetracarboxylic acid and meso -tetraester functionalized calix[4]pyrroles were synthesized by condensation of pyrrole with levulinic acid and ethyl pyruvate in sufficient yields. In addition, mixed condensation products can also be synthesized using this method. These new compounds may be useful as molecular receptors and polyfunctional starting materials for further derivatization. [source] Vinylic and ring-opening metathesis polymerization of norbornene with bis(,-ketoamine) cobalt complexes,JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 22 2005Feng Bao Abstract Cobalt complexes 1,4 bearing N,O -chelate ligands based on condensation products of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone with aniline, o -methylaniline, ,-naphthylamine, and p -nitroaniline, respectively, were synthesized, and the structures of 1 and 4 were characterized by single-crystal X-ray diffraction analyses. The bis(,-ketoamine) cobalt complexes could act as moderately active catalyst precursors for norbornene polymerization with the activation of methylaluminoxane. This catalytic reaction proceeded mainly through a vinyl-type polymerization mechanism. 1H NMR and IR showed that in all cases, a small amount of double bonds raised from ring-opening metathesis polymerization (ROMP) was present in the polymerization products. The variation of the polymerization conditions affected the ROMP unit ratio in the polynorbornenes. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5535,5544, 2005 [source] A new class of anthocyanin-procyanidin condensation products detected in red wine by electrospray ionization multi-stage mass spectrometry analysisRAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 3 2010Baoshan Sun In our previous work, we have identified, in a model wine solution containing malvidin 3-glucoside, epicatechin and acetaldehyde, a new condensation product , hydroxylethyl-malvidin-3-glucoside-ethyl-epicatechin. The objective of this work was to verify the presence of such new condensation products in red wine. For this purpose, red wine was fractionated into various fractions by column chromatography on LiChroprep RP 18 and on Toyopearl 40 (F). The phenolic composition of each fraction was verified by HPLC-DAD and direct-infusion ESI-MSn analysis. In addition to the well-known anthocyanins and their acetyl and coumaroyl derivatives, and several direct and indirect anthocyanin-(epi)catechin condensation products, a new class of pigmented products, namely hydroxyethyl-anthocyanin-ethyl-flavanol compounds, have been detected in red wine. The new class of pigmented products would be expected to be the major pigments responsible for the color of aged red wine. Copyright © 2010 John Wiley & Sons, Ltd. [source] Preparation and properties of polyhedral oligomeric silsesquioxane,polysiloxane copolymersAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 8 2010Takahiro Gunji Abstract All siloxane-type siloxane,polyhedral oligomeric silsesquioxane [(HSiO3/2)8, T8H] copolymers were synthesized by the dehydrogenative condensation of T8H with diphenylsilanediol, tetraphenyldisiloxane-1,3-diol or silanol-terminated polydimethylsiloxanes in the presence of diethylhydroxylamine followed by trimethylsilylation. Coating films were prepared by spin-coating of the coating solutions prepared from the dehydrogenative condensation products. The hardness of the coating films was evaluated by a pencil hardness test and was found to increase up to 6H with increases in the curing temperature. Silica gels were prepared by concentrating the coating solution following by pyrolysis. These silica gels showed a specific surface area 449 m2/g at 650 °C corresponding to the formation of a silica network in response to combustion of the phenyl groups. Copyright © 2009 John Wiley & Sons, Ltd. [source] A Dynamic Tricopper Double HelicateCHEMISTRY - A EUROPEAN JOURNAL, Issue 15 2006Marie Hutin Abstract The reaction between 8-aminoquinoline, 1,10-phenantholine-2,9-dicarbaldehyde, and copper(I) tetrafluoroborate gave a quantitative yield of a tricopper double helicate. The presence of dynamic covalent imine (CN) bonds allowed this assembly to participate in two reactions not previously known in helicate chemistry: 1) It could be prepared through subcomponent substitution from a dicopper double helicate that contained aniline residues. An electron-poor aniline was quantitatively displaced; a more electron-rich aniline competed effectively with the aminoquinoline, setting up an equilibrium between dicopper and tricopper helicates that could be displaced towards the tricopper through the addition of further copper(I). 2) Both dicopper and tricopper helicates could be prepared simultaneously from a mixture of phenanthroline dialdehyde, aniline, and aminoquinoline, which contained all possible imine condensation products in equilibrium. Following the addition of copper(I), thermodynamic equilibration on both covalent and coordinative levels eliminated all partially-formed and mixed imine ligands from the mixture, leaving the helicates as exclusive products. La réaction entre la 8-aminoquinoline, la 1,10-phenanthroline-2,9-dicarbaldehyde et le cuivre(i,) tetrafluoroborate conduit à la formation quantitative d'un double hélicate à trois cuivres. Grâce à la liaison imine (CN) dynamique et covalente, cet assemblage participe à deux réactions nouvelles dans la chimie des hélicates : 1) L'hélicate peut être préparé par la substitution de composants à partir d'un double hélicate à deux cuivres incorporant des anilines. Une aniline pauvre en électrons est déplacée quantitativement par l'aminoquinoline ; une aniline plus riche en électrons est déplacée plus difficilement, conduisant ainsi à un équilibre entre l'hélicate à deux cuivres et celui à trois cuivres. Cet équilibre peut être déplacé vers la formation de l'hélicate à trois cuivres par l'addition d'un excès de cuivre(i,). 2) Les hélicates à deux et trois cuivres peuvent être préparés simultanément en ajoutant du cuivre(i,) à un mélange d'aminoquinoline, d'aniline et de phenanthrolinecarbaldehyde contenant tous les produits de condensation possibles à l'équilibre. Suite à cet ajout, l'équilibre thermodynamique élimine les ligands partiellement formés ou mixtes, laissant les hélicates comme uniques produits. [source] | ||||||||||