Search results for "ACID"
showing 10 items of 13107 documents
Promoting the activity and selectivity of high surface area Ni–Ce–O mixed oxides by gold deposition for VOC catalytic combustion
2011
Gold supported on nickel cerium oxide catalysts (Ni–Ce–O) have been studied for the total oxidation of propane, as a model for hydrocarbon volatile organic compound emission control. High surface area Ni–Ce–O catalysts were synthesized using a very simple evaporation method, where cerium and nickel salts were evaporated in the presence of a mixture of methanol and oxalic acid. Gold catalysts were prepared following a deposition–precipitation method. A very efficient catalyst for the oxidation of propane, in terms of both activity and selectivity, was obtained. This high activity has been related to the high surface area of the catalyst (and therefore to the presence of more active sites ava…
ChemInform Abstract: Modular Hemisyntheses of Boronato- and Trifluoroborato-Substituted L-NHBoc Amino Acid and Peptide Derivatives.
2014
Modular hemisyntheses of boronato- and trifluoroborato-substituted amino acid derivatives are achieved based on the reaction of Wittig reagent (I) with aldehydes followed by Ir-catalyzed boronation.
Synthese und pharmakologische Wirkung von carbocyclischen Muskarinanalogen
1974
Als carbocyclische Muskarinanaloga wurden das (3-Hydroxycyclopentylmethyl)trimethyl-ammonium-jodid und dessen Acetat dargestellt und am isolierten Ileum des Meerschweinchens untersucht. Synthesis and Pharmacological Activity of Carbocyclic Analogs of Muscarine As carbocyclic analogs of muscarine (3-hydroxycyclopentylmethyl)trimethylammonium iodide and (3-acetoxycyclopentylmethyl)trimethylammonium iodide were synthesized and tested on the isolated guinea pig ileum.
Synthesis of a Tyr3-octreotate conjugated closo-carborane [HC2B10H10]: a potential compound for boron neutron capture therapy
2003
Abstract A novel Tyr 3 -octreotate conjugated closo -carborane as a potential compound for boron neutron capture therapy was obtained via Fmoc solid phase peptide synthesis. The boron cluster [C 2 B 10 H 11 ] was introduced through the reaction of 6,9-bis(acetonitrile)decaborane and 5-hexynoic acid yielding a new closo -carborane conjugated carboxylic acid which was coupled subsequently with solid phase conjugated Tyr 3 -octreotate. The final boron-containing peptide was purified by preparative reverse phase HPLC and structural identity was proved applying MALDI-TOF mass spectrometry.
Versuche zur Herstellung linolsäurearmen Ölsäureesters über eine Hydrierung mit Palladium
1980
Uber eine Hydrierung mit Palladium auf Aktivkohle konnen geringe Gehalte an Linolsaure in Gegenwart eines hohen Olsaureuberschusses recht selektiv reduziert werden. Der Linolsauregehalt eines Fettsauremethylestergemisches wurde von 10% auf 2% gesenkt, dabei entstanden 3% cis-, 4% trans-Monoenfettsauren sowie 1% Stearinsaure. The Preparation of Oleic Ester with Reduced Linoleic Acid Content by Hydrogenation with Palladium By hydrogenation with palladium on charcoal low contents of linoleic acid can be reduced quite selectively in the presence of an excess of oleic acid ester. In a mixture of fatty acid methylesters the content of linoleic acid was reduced from 10% to 2% with the formation of…
Phosphonium-Boronate Amino Acid Derivatives as Fluoride Pincers for 18F-Labelling
2015
The synthesis of phosphonium-boronate amino acid derivatives was achieved by quaternization of o-boronatophenylphosphine with iodo-amino acid derivatives. Preliminary radiolabelling studies demonst...
Isobaric Vapor−Liquid Equilibria for Water + Acetic Acid + Potassium Acetate
2004
Isobaric vapor−liquid equilibria for water + acetic acid + potassium acetate at different salt concentrations as well as for solvent + potassium acetate binary mixtures have been obtained at 100 kPa. Potassium acetate is more effective in the salting-out effect (on water) than lithium and sodium acetates. The eNRTL-CT model, which is a combination of electrolyte nonrandom two-liquid and chemical theory models, has been used to fit the experimental data. The binary parameters of the model have been obtained from the experimental binary vapor−liquid equilibria which have been used to suitably reproduce the vapor−liquid equilibria (VLE) for water + acetic acid + potassium acetate ternary syste…
Synthesis, characterization and antimicrobial activity of palladium(II) complexes with some alkyl derivates of thiosalicylic acids: Crystal structure…
2012
Abstract S-Alkyl (R = benzyl, methyl, ethyl, propyl and butyl) derivatives of thiosalicylic acid and the corresponding palladium(II) complexes were prepared and their structures were proposed on the basis of infrared, 1H and 13C NMR spectroscopy. The cis geometrical configurations of the isolated complexes were proposed on the basis of an X-ray structural study of the bis(S-benzyl-thiosalicylate)–palladium(II), [Pd(S-bz-thiosal)2] complex. Antimicrobial activity of the tested compounds was evaluated by determining the minimum inhibitory concentration (MIC) and minimum microbicidal concentration (MMC) in relation to 26 species of microorganisms. The tested ligands, with a few exceptions, sho…
Enantioselective transport of amino acid through supported chiral liquid membranes
1993
Abstract Two chiral alcohols, nopol and (2S)-(−)-methyl-1-butanol, immobilized in the pores of a polyethylene film were used for the anantioselective transport of amino acid hydrochloride. The degree of stereoselectivity of the permeation process varied from 0.39 to 1.52 depending on both the type of the chiral membrane phase and the properties of the amino acid. The evaluation of the membrane ability to separate stereoisomers was performed by the step-by-step analysis by considering the effect of amino acids' hydrophobicity, polarity and degree of chirality. For the purpose of this paper, the chirality measure was introduced. It was demonstrated that the enantioselectivity was affected mai…
Stereoselective glycosylation of Alcohols and Silyl Ethers Using Glycosyl Fluorides and Boron Trifluoride Etherate
1985
The stereoselective glycosylation of alcohols and their silyl ethers has been achieved using O-alkyl-, O-acyl-, and acetal-protected glycosyl fluorides of the pyranose and furanose series and boron trifluoride etherate in CH2Cl2.