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  • 1
    Electronic Resource
    Electronic Resource
    Zur Bildung von Difluorhalogenmethylarsanen durch Reaktion von Difluorcarben mit Arsenhalogeniden (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 588 (1990), S. 26-32 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Difluorohalomethyl Arsanes by Interacting Difluorocarbene with Arsenic HalidesBis(trifluoromethyl)cadmium stabilized by acetonitrile, Cd(CF3)2 · 2 CH3CN, is used as source for the in situ formation of difluorocarbene. Difluorocarbene reacts with arsenic halides, AsX3 (X = Cl, Br, I) to form the corresponding difluorohalomethylarsanes, As(CF2X)nX3-n. The extent of insertion increases in the series AsCl3 〈 AsBr3 〈 Asl3. The cadmium complex behaves towards AsF3 as trifluoromethylating agent.
    Notes: Für die in situ Erzeugung von Difluorcarben wird mit Acetonitril stabilisiertes Bis(trifluormethyl)cadmium, Cd(CF3)2 · 2 CH3CN, verwendet. Dieses reagiert mit Arsenhalogeniden, AsX3 (X = Cl, Br, I) unter Bildung entsprechender Difluorhalogenmethylarsane, As(CF2X)nX3-n. Das Ausmaß der Insertion nimmt in der Reihe AsCl3 〈 AsBr3 〈 AsI3 zu. Gegenüber AsF3 verhält sich der Cadmiumkomplex als Trifluormethylierungsagens.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905880104
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen zur SiF4-Sorption an Kieselglaspulvern (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 589 (1990), S. 235-239 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Absorption of SiF4 at Silica PowdersThe absorption of SiF4 at silica powder was investigated in dependence on temperature and pressure. It starts at about 800 K. In the range of 800 K up to 1160 K the amount of SiF4 absorbed within 24 hours increases with temperature, and at a constant temperature (880 K) with the filling pressure of SiF4 (2 kPa-30 kPa). Desorption of SiF4 was proved experimentally at temperature above 1273 K. It is connected with crystallization of silica into β-cristobalite.
    Notes: Es wurde die Druck- und Temperaturabhängigkeit der Sorption von SiF4 an Kieselglaspulvern untersucht. Die Sorption setzt bei etwa 800 K ein. Von 800 K bis 1160 K nimmt der in 24 Stunden absorbierte SiF4-Anteil mit der Temperatur zu. Bei konstanter Temperatur (880 K) wächst die absorbierte Menge mit dem Ausgangsdruck (2 kPa - 30 kPa). Die Desorption ist bei Temperaturen ≥ 1273 K experimentell nachweisbar und mit der Kristallisation des Kieselglaspulvers zu β-Cristobalit verbunden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905890126
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Reaktion von Trifluorhalomethanen mit Phosphanen (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1099-1102 
    Details
    ISSN: 0044-2313
    Keywords: Trifluorohalomethanes ; Trifluoromethylphosphonium Halides ; Trifluoromethylphosphanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Reaction of Trifluorohalomethanes with PhosphanesThe reactions of trifluorohalomethanes CF3X (X = Cl, Br, I) with Ph3P, Bu3P, (Me2N)3P, and (Et2N)3P were investigated. CClF3 does not react. In the reactions of CBrF3 and CF3I with Bu3P in acetonitrile trifluorophosphonium salts, [Bu3PCF3]X (X = Br, I), are formed, whereas gaseous CF3I and Bu3P yield Bu2PCF3. Depending on the reaction conditions the aminophosphanes form either [(R2N)3PX]X (R = Me, Et; X = Br, I) and CF3H or [(R2N)3PCF3]X.
    Notes: Es wird über die Reaktionen der Trifluorhalomethane CF3X (X = Cl, Br, I) mit Ph3P, Bu3P, (Me2N)3P und (Et2N)3P berichtet. CClF3 verhält sich inert. CBrF3 und CF3I bilden in Acetonitril mit Bu3P Trifluormethylphosphoniumsalze, [Bu3PCF3]X (X = Br, I), während sich gasförmiges CF3I mit Bu3P zu Bu2PCF3 umsetzt. Die Aminophosphane reagieren in Abhängigkeit von den Reaktionsbedingungen zu [(R2N)3PX]X (R = Me, Et; X = Br, I) und CF3H bzw. [(R2N)3PCF3]X.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200625
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Reaktion von Halomethylphosphoniumhalogeniden, [R3PCYnX3-n]X, mit Phosphanen, R′3P (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1103-1109 
    Details
    ISSN: 0044-2313
    Keywords: Halomethylphosphonium Halides ; Bisphosphonium Salts ; Phosphoranylphosphonium Salts ; Transalkylation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Reaction of Halomethylphosphonium Halides, [R3PCYnX3-n]X, with Phosphanes, R′3PThe results of the reaction of 19 different halomethylphosphonium halides, [R3PCYnX3-n]X (R = Ph, n-Bu, Me2N, Et2N; Y = H, F; X = Cl, Br, I; n = 0-2), with Ph3P, n-Bu3P, and (R2N)3P are presented. As reaction products bisphosphonium salts, [R3P—CYnX2-n—PR′3]X2, and phosphoranylphosphonium salts, [R3P=CY—PR′3]X, or reduced (halo)methyl-phosphonium salts, [R3PCHYnX2-n]X, are obtained. [Ph3PCBrF2]Br and [Bu3PCBrF2]Br react with R′3P by trans-alkylation forming [R′3PCBrF2]Br. The factors influencing the course of the reaction are discussed.
    Notes: Es wird über die Reaktion von 19 verschiedenen Halomethylphosphoniumsalzen, [R3PCYnX3-n]X (R = Ph, n-Bu, Me2N, Et2N; Y = H, F; X = Cl, Br, I; n = 0-2), mit Ph3P, n-Bu3P und (R2N)3P berichtet. Als Reaktionsprodukte werden Bisphosphoniumsalze, [R3P—CYnX2-n—PR′3]X2, und Phosphoranylphosphoniumsalze, [R3P=CY—PR′3]X, oder reduzierte (Halo)methylphosphoniumsalze, [R3PCHYnX2-n]X, erhalten. [Ph3PCBrF2]Br und [Bu3PCBrF2]Br reagieren mit R′3P unter Umalkylierung zu [R′3PCBrF2]Br. Die den Reaktionsverlauf beeinflussenden Faktoren werden diskutiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200626
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  • 5
    Electronic Resource
    Electronic Resource
    Korrosion von grauem Gußeisen in konzentrierter Schwefelsäure (1983)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 14 (1983), S. 141-147 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion of Grey Cast Iron in Concentrated Sulphuric AcidThe Pauling process of regenerating spent sulphuric acid is an example of industrial application of the corrosion resistance of grey cast iron in boiling strong sulphuric acid. The corrosion behaviour of cast iron in boiling sulphuric acid depends on the corrosion potential. At a high corrosion potential, the material shows a stable passive state.In a study on the influence of the alloy components Si, Cu and Sn on the corrosion resistance of grey cast iron, the following results were derived:In the active state, cast iron containing more than 1,4-1,5% Si exhibits a corrosion maximum in 97% boiling sulphuric acid, whereas alloyed grey cast iron with low Si content displays in the active state better corrosion behaviour over the whole concentration range from 93-98% H2SO4.When the alloyed cast iron is in the passive state, corrosion resistance increases as the silicon content is reduced and the sulphuric acid concentration is raised.
    Notes: Die Beständigkeit von grauem Gußeisen in siedender konzentrierter Schwefelsäure findet im Pauling-Verfahren zur Regeneration von Abfallschwefelsäure technische Anwendung. Das Korrosionsverhalten des Gußeisens in der siedenden Säure ist abhängig vom Korrosionspotential. Bei hohem Korrosionspotential tritt Passivität des Materials ein.In einer Untersuchung konnte der Einfluß der Legierungsbestandteile Si, Cu und Sn auf die Korrosionsbeständigkeit von Grauguß geklärt werden:Gußeisen, das mehr als 1,4-1,5% Si enthält, zeigt im aktiven Zustand in 97%iger siedender Schwefelsäure ein Korrosionsmaximum. Demgegenüber weist Si-armer, legierter Grauguß im aktiven Zustand für den ganzen Konzentrationsbereich von 93-98% H2SO4 besseres Korrosionsverhalten auf.Im passiven Zustand des legierten Gußeisens steigt die Korrosionsbeständigkeit mit abnehmendem Si-Gehalt des Materials und zunehmender H2SO4-Konzentration an.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19830140506
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  • 6
    Electronic Resource
    Electronic Resource
    Über Allo-cyclogeraniol (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1791-1797 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus dem Gemisch der beiden β,γ-ungesättigten Isomeren V und VI des Geraniols wurde bei Behandlung mit Ameisensäure bei l00° Allo-cyclogeraniol erhalten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370624
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  • 7
    Electronic Resource
    Electronic Resource
    Die Cyclisation der α-Methyl-geraniumsäure (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1779-1790 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A. Die „α-Methyl-geraniumsäure“ enthält ca. 1/4 α, β- und 3/4, β, γ-ungesättigte Isomere. Demgemäss bildet sich bei Behandlung mit Ameisensäure-Schwefelsäure nür wenig 2-Methyl-α-cyclo-geraniumsäure (fest), zur Hauptsache aber α-Methyl-allo-cyclo-geraniumsäure (flüssig). Der Befund von Tiffenau wird damit berichtigt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370623
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  • 8
    Electronic Resource
    Electronic Resource
    Die Cyclisation der α,α-Dimethyl-geraniumsäure (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 2200-2203 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α,α-Dimethyl-geraniumsäure (β,γ-ungesättigt) ergibt bei der säurekatalysierten Cyclisation, wie zu erwarten ist, ausschliesslich α,α-Dimethyl-allo-cyclogeraniumsäure. Diese wird andererseits auf eindeutige Art, ausgehend von einem cyclischen Produkt, synthetisch gewonnen. Die Säuren selbst sowie die entsprechenden Alkohole und deren Dihydroderivate sind je mit einander identisch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370733
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  • 9
    Electronic Resource
    Electronic Resource
    The polymer-forming reactions of 3,3,3-trichloropropylene oxidePresented in part, at the may 1970 meeting of the Society of Plastic Engineers, New York, N. Y. (1971)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 11 (1971), S. 312-319 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 3,3,3-Trichloropropylene oxide (TCPO) is a monomer which has the combination of a highly reactive epoxide group and a stable trichloromethyl group. The epoxy group will undergo ring opening polymerizations with itself and with a host of other compounds to yield polymeric materials. Water, alcohols, phenols, amines, carboxylic acids and many other compounds react with TCPO with the aid of Lewis acid type catalysts. The electron-withdrawing influence of the trichloromethyl group, steric effects and the oxirane ring have a strong influence on the course of reactions, which are often radically different from that encountered with the simpler alkylene oxide monomers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760110408
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  • 10
    Electronic Resource
    Electronic Resource
    Immobilized enzymes - semisynthetic catalysts (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 3 (1979), S. 107-127 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The immobilization of various enzymes, mainly of hydrolases, by carriers with e.g. maleimide, benzoquinone, N-substituted sulfamic acid, and diazonium groups will be described. As basic polymer mainly poly(vinyl alcohol) was used which was derivatized. The immobilization of enzymes was performed also with synthetic wood pulp. The influence of unfolding of the enzyme chains during the immobilization reaction on the characteristics of the immobilization products as well as the influence of the spacer length on the immobilization was investigated. An example of a soluble immobilized trypsin product is given. Some aspects of the characterization of immobilized enzymes will be discussed. Also some examples of whole cell immobilization as well as of application of immobilized enzymes and immobilized whole cells will be described.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.020031979106
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