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  • 1
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Combined gas chromatography-mass spectrometry and isotope labeling techniques have been employed to demonstrate that the carboxamide nitrogen atom in 2-carboxamido-5-isopropoxycarbonylaminobenzimidazole, a metabolite of 2-thiazolyl-5-isopropoxycarbonylaminobenzimidazole (cambendazole), is derived wholly from the parent drug. [15N] Thiazole-labeled cambendazole was administered to a rat and the metabolite isolated from urine. Trideutero-2-carboxamido-5-isopropoxycarbonylaminobenzimidazole was employed as a carrier to isolate the metabolite in sufficient purity for isotope ratio measurements using multiple ion detection. The metabolite was converted to its tetramethyl derivative by on-column reaction with trimethylanilium hydroxide to permit satisfactory gas chromatography.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 483-492 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Bipolar Ion Exchange ResinsSyntheses of weakly acid/strongly basic and weakly acid/weakly basic bipolar ion exchange resins with varying acid and basic capacities via subsequent introduction of the exchange active groups in suitable crosslinked skeletal polymers are described.Methylacrylate-styrene-divinylbenzene polymers of varying composition which can be quantitatively chloromethylated and subsequently fully aminated (trimethylamine) and partially saponified in one process step were used as starting polymers for weakly acid/strongly basic resins. The reverse route saponification of the ester groups first, followed by chloromethylation of the aromatic parts of the matrix and animation turned out to the possible, if at all, only for bipolar resins of strongly predominant basic character. The capacity parameters can be controlled through the composition of the matrix.Polymethylacrylates crosslinked with divinylbenzene served as polymer basis of the weakly acid/weakly basic bipolar ion exchange resins. The functionalization was achieved by partial aminolysis with polyamines (dimethylaminopropylamine, ethylenediamine, diethylenetriamine) and saponification with lyes. The number of basic and acid groups which can be introduced is governed primarily by the conditions of the aminolysis. The capacity parameters are controllable within a broad range by the procedures.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 433 (1977), S. 284-286 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Influence of the Heat Treatment of the Basic Glass on the Properties of Porous GlassesThe influence of the heat treatment of the basic glass has been studied in respect to the carrier properties of porous glasses for platinum (1 wt.-%) for dehydrocyclization of n-hexane. Connections between heat treatment micropore structure and catalytic activity are discussed.
    Notes: Es wurde der Einfluß der thermischen Vorbehandlung des Ausgangsglases (7% Na2O, 23% B2O3, 70% SiO2) auf die Trägereigenschaften poröser Gläser für Platin (1 Gew.-%) bei der Dehydrocyclisierung von n-Hexan untersucht. Zusammenhänge zwischen Thermobehandlung, Mikroporenstruktur und katalytischer Aktivität werden diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 359 (1968), S. 14-29 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The gas-phase interactions between NO2 and SO2 at PH2O 〈 5 · 10-3 to ∼1 10-6 Torr and temperatures up to 230°C have been manometrically investigated. Under unhydrous conditions, interaction begins at 225° and 230°C according to the equations (1-3) in „Inhaltsübersicht“. In the presence of wate vapour (PH2O 〈 5 ° 10-3 Torr), the rapid reaction (4) proceeds already at 25°C, accompanied by the equilibrium (5) and followed, after all water is consumed, by the slower reactions (6) and (7).
    Notes: Es werden die Umsetzungen zwischen NO2 und SO2 in der Gasphase bei Wasserdampfpartialdrücken von PH2O 〈 5 · 10-3 bis ∼1 · 10-6 Torr und Reaktionstemperaturen bis 230°C manometrisch untersucht.NO2 und SO2 reagieren im trockenen Zustand erst bei 225°C und 230°C: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {2{\rm No}_{\rm 2} {\rm 2 NO + O}_{\rm 2} } & {(1)} \\ \end{array} $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {2{\rm SO}_{\rm 2} + {\rm O}_{\rm 2} {\rm 2 SO}_{\rm 3} } & {(2)} \\ \end{array} $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {2{\rm SO}_{\rm 3} + {\rm NO}_{\rm 2} + {\rm NO } \to {\rm (NO)}_{\rm 2} {\rm S}_{\rm 2} {\rm O}_{\rm 7} .} & {(3)} \\ \end{array} $$\end{document} Bei Gegenwart von Wasserdampf (PH2O 〈 5 · 10-3) tritt zwischen NO2 und SO2 bereits ab 25°C rasch Umsetzung ein, die sich später verlangsamt. Hierbei wird die Gesamtreaktion durch die bekannte Umsetzung (4) eingeleitet: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {3{\rm NO}_{\rm 2} + 2{\rm SO}_{\rm 2} + {\rm H}_{\rm 2} {\rm O} \to {\rm 2 NOHSO}_{\rm 4} + {\rm NO}{\rm .}} & {(4)} \\ \end{array} $$\end{document} NO setzt sich mit unumgesetztem NO2 ins Gleichgewicht: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm NO}_{\rm 2} + {\rm NO}{\rm N}_{\rm 2} {\rm O}_3 .} & {(5)} \\ \end{array} $$\end{document} Auch nach Verbrauch der Wasserspuren kommt die Umsetzung nicht zum Stillstand, sondern verläuft, wenn auch langsamer, gemäß \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {3{\rm N}_2 {\rm O}_3 + 2{\rm SO}_{\rm 2} \to ({\rm NO})_2 {\rm S}_{\rm 2} {\rm O}_{\rm 7} + 4{\rm NO,}} & {(6)} \\ \end{array} $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm NO} + 3{\rm NO}_{\rm 2} + 2{\rm SO}_{\rm 2} \to ({\rm NO})_2 {\rm S}_{\rm 2} {\rm O}_{\rm 7} + 2{\rm NO}{\rm .}} & {(7)} \\ \end{array} $$\end{document}
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 237-246 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ionexchange on Porous GlassesPorous alkali-boron-silicate glasses show the following sequence of coefficients of the ionexchange-selectivity: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Ti}^{\rm + } 〉 {\rm Ag}^{\rm + } 〉 {\rm K}^{\rm + } 〉 {\rm Na}^{\rm + } 〉 {\rm Li}^{\rm + } . $$\end{document} The degree of ionexchange for divalent ions is only very little. The ionexchange capacity is influenced by the degree of phase-separation of the original glasses and has the origin in BOH groups. The energies of activation for the ionexchange reactions are 10.6-11.8 kcal/mol.
    Notes: An porösen Alkali-Bor-Silikatgläsern konnte folgende Abstufung der Ionenaustausch-Selektivitätskoeffizienten ermittelt werden: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Ti}^{\rm + } 〉 {\rm Ag}^{\rm + } 〉 {\rm K}^{\rm + } 〉 {\rm Na}^{\rm + } 〉 {\rm Li}^{\rm + } . $$\end{document} Der Ionenaustausch für 2wertige Ionen ist nur gering. Die Ionenaustauschkapazität läßt sich auf den Grad der Phasentrennung in den Ausgangsgläsern zurückführen und beruht auf dem Vorhandensein von BOH-Gruppen. Die Aktivitätsenergien für die Ionenaustausch-Reaktionen liegen zwischen 10,6-11,8 kcal/Mol.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 242-248 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Hydrogenation of Hydrocarbons on Catalysts of the System Porous Glass-MetalThe hydrogenation of hydrocarbons such as cyclohexen, benzene and styrene on metal catalysts (Ni, Pd, Pt) supported by porous glasses and zeolites was investigated in the gasphase.In dependence on the pore structure catalysts of the type porous glass-metal are able to a shape selective catalysis like zeolite catalysts.
    Notes: Die Hydrierung von Kohlenwasserstoffen, wie Cyclohexen, Benzol und Styrol wurde in der Gasphase an Metall-Trägerkatalysatoren (Ni, Pd, Pt) auf der Basis von porösen Gläsern und Zeolithen untersucht.In Abhängigkeit von der Porenstruktur zeigen Katalysatoren des Typs poröses Glas-Metall die Fähigkeit zu einer formselektiven Katalyse wie Zeolith-Katalysatoren.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 249-252 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation of CO over Catalysts Supported by Porous GlassesIt is reported on the catalytic activity of metal catalysts (Ag, Mn, Ni, Cu/Zn, Fe/Cr) supported by porous glasses for the oxidation of CO. In comparison with impregnated carrier catalysts metal catalysts prepared by ionexchange of porous glasses (Ag+) show a higher activity for oxidation of CO.The preparation of ionexchanged forms of porous glasses is described.
    Notes: Es wird über die katalytische Aktivität von Metallkatalysatoren (Ag, Mn, Ni, Cu/Zn, Fe/Cr) auf der Basis poröser Gläser bei der Oxydation von CO berichtet. Im Vergleich zu imprägnierten Metall-Trägerkatalysatoren zeigen die durch Ionenaustausch von porösen Gläsern mit Metallionen (Ag+) hergestellten Metall-Trägerkatalysatoren eine höhere Aktivität für die Oxydation von CO.Die Herstellung ionenausgetauschter Formen poröser Gläser wird beschrieben.
    Additional Material: 1 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 461 (1980), S. 211-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Selectivity of Ion Exchange on Dealuminated MordenitesIon Exchange selectivity of Na-mordenites dealuminated by HCl for K+, Mg++, Ca++, and Ba++ ions was investigated. Selectivity for K+ ions decreases nearly linear with increasing dealumination of mordenite whereas the selectivity for alkaline earth ions increases. Due to dealumination of mordenite its characteristical preference for monovalent towards divalent cationa is reversed.
    Notes: An mit HCl unterschiedlich stark dealuminierten Mordeniten wurde die Selektivität des Austausches von Na+-Ionen gegen K+-, Mg++-, Ca++- und Ba++-Ionen untersucht. Dabei nimmt die Selektivität für K+-Ionen mit zunehmender Dealuminierung des Mordenits nahezu linear ab, während die Selektivität für die Erdalkaliionen zunimmt. Die für Mordenit charakteristische Bevorzugung einwertiger gegenüber zweiwertiger Kationen wird durch die Dealuminierung des Mordenits ins Gegenteil verkehrt.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 393 (1972), S. 50-58 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the chemically thermal modification of gelatinous silica with B2O3The chemically thermal modification of gelatinous silica with boron oxide was studied in dependence on the quantity of impregnated boron oxide, on time, and temperature of the treatment. A. condensation mechanism is discussed on the basis of structure variation of the modification samples.
    Notes: Die chemisch-thermische Modifizierung von Kieselgel mit Boroxid wurde untersucht in Abhängigkeit von der Menge an aufgetränktem Boroxid, von der Zeit und der Temperatur der Thermobehandlung. Ein Kondensationsmechanismus wird im Zusammenhang mit Strukturveränderungen diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 457 (1979), S. 224-228 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ion Exchange of Monovalent Cations in Synthetic Sodium Polysilicates with Layer StructureCation-exchange equilibria of synthetic sodium polysilicates Ilerit (Na2O · 8.3SiO2 8.9 H2O) and Magadiite (Na2O · 13 SiO2 · 6.8 H2O) with H+, Li+ and K+ Ions were investigated with respect to their selectivity behaviour. The range of ion selectivity is: H+ 〉 Na+ 〉 Li+ 〉 K+. Thermodynamic data ΔG, ΔH, and ΔS were determined by means of the integral thermodynamic equilibria constants Kth of the ion-exchange reactions.
    Notes: Die Kationenaustauschgleichgewichte der synthetischen Natriumpolysilicate Ilerit (Na2O · 8,3 SiO2 · 8,9 H2O) und Magadiit (Na2O · 13 SiO2 · 6,8 H2O) mit H+—, Li+- und K+-Ionen wurden im Hinblick auf ihre Selektivitätsverhalten untersucht. Es resultiert folgende Ionenselektivitätsabstufung: H+ 〉 Na+ 〉 Li+ 〉 K+. Die thermodynamischen Größen ΔG, ΔH und ΔS wurden über die integrale thermodynamische Gleichgewichtskonstante Kth der Ionenaustauschreaktionen bestimmt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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