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  • Chemistry  (8)
  • Polymer and Materials Science  (2)
  • conductance  (1)
  • enthalpy  (1)
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • 1985-1989  (3)
  • 1970-1974  (4)
  • 1965-1969  (3)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Review of electrolytic conductance standards (1987)
    Springer
    Journal of solution chemistry 16 (1987), S. 985-997 
    Details
    ISSN: 1572-8927
    Keywords: Aqueous solution ; cell constant ; conductance ; electrolytic conductivity ; potassium chloride ; primary ; resistance ; resistivity, secondary, standards, and temperature scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Measurements of aqueous electrolytic conductance are performed routinely in a variety of disciplines and industries. Conductivity is a measure of the ionic content in solution and thus has applications in pharmaceuticals, power plants, rainwater, lake surveys, and oceanography, to name a few. A thorough review of the measurement of and standards for aqueous electrolytic conductance is herein presented. At present, the most precise and accurate standards have been set forth by the International Organization of Legal Metrology (OIML), and have been adopted by most other standards organizations. However, the uncertainty assigned to these standards, especially the secondary standards, is somewhat larger than would be expected from the physical aspects of the measurement. Several changes in the units and measurement scales, including temperature, volume, molar mass, resistance, and concentration obfuscate the accuracy of these standards. In addition to the review, research is proposed, using a conductance cell with variable length, to establish new standards for aqueous electrolytic conductance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652583
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of DCl in D2O solution from 5 to 50°C (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 675-692 
    Details
    ISSN: 1572-8927
    Keywords: Deuterium chloride ; deuterium oxide ; electrochemical cell ; emf ; enthalpy ; entropy ; free energy ; heat capacity ; isotope effect ; standard potential ; thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The themodynamic properties of solutions of deuterium chloride (DCl) in deuterium oxide (D2O) have been determined from emf measurements of the electrochemical cell without transference from 5 to 50°C, and from 0.002 to 1.0 mol-kg−1. The standard potential of the silver/silver chloride electrode relative to the platinum/deuterium electrode has been determined. An equation for the Gibbs energy as a function of temperature has been derived from which the enthalpy, entropy, and heat capacity have been computed. Equations for the activity coefficient and the osmotic coefficient of DCl in D2O have been developed. The excess Gibbs energy of the solution and the excess partial molar free energy as a function of temperature have been calculated, from which the other excess thermodynamic properties have been computed. The values for the heat capacity and the apparent molar heat capacity have been compared with calorimetric data in the literature. The relative partial molar enthalpy has been calculated. The solvent isotope effect on the excess thermodynamic functions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644599
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  • 3
    Electronic Resource
    Electronic Resource
    Die analytische Chemie im Dienste1 Plenarvortrag auf der Festsitzung der Gesellschaft Deutscher Chemiker anläßlich der ACHEMA am 20. 6. 1970 der Werkstoffentwicklung (1971)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 2 (1971), S. 135-144 
    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: Analytical Chemistry used for developing new materials. The development of new materials constantly confronts the analyst with difficult new problems. Of particular importance for this work would be all methods permitting to lay bare the phase interface and to study their structure and perturbations of this structure. The analyst has to solve these problems in close contact with the technologists specializing in this modern technique.
    Notes: Die Entwicklung neuer Werkstoffe stellt den Analytiker vor immer neue diffizile Aufgaben. Insbesondere dürften alle Verfahren, mit denen es gelingt, Phasengrenzflächen freizulegen und ihren Aufbau sowie Störungen in diesem Aufbau zu studieren, für diese Aufgaben von großer Bedeutung sein. Der Analytiker muß diese Aufgaben in engster Fühlung mit den Technologen, die sich dieser modernen Entwicklung verschrieben haben, lösen.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19710020305
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  • 4
    Electronic Resource
    Electronic Resource
    Die Schwingungsspektren der Methyl- und Phenylchlorphosphine (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 337 (1965), S. 174-182 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The vibrational spectra of PCl(CH3)2, PCl2CH3, PCl(C6H5)2 and PCl2C6H5 are reported and discussed. For the methyl compounds the force constants are calculated.
    Notes: Es werden die Schwingungsspektren von PCl(CH3)2, PCl2CH3, PCl(C6H5)2 und PCl2C6H5 mitgeteilt, mit den Spektren von PCl3, P(CH3)3 und P(C6H5)3 verglichen und den Grundschwingungen zugeordnet. Für die Methylverbindungen werden die Kraftkonstanten berechnet und die Bindungsverhältnisse diskutiert. Darstellung und Eigenschaften der Methylverbindungen werden beschrieben.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19653370310
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  • 5
    Electronic Resource
    Electronic Resource
    Radical ions as chain carriers in polymerization reactions (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 12 (1985), S. 105-123 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Certain polymerization reactions show the formation of medium molecular weights at the beginning of the reaction, although they can be considered to be polycondensations. The principle of equal reactivity of the end groups is not given in this case. Intermediates more reactive than the monomer are formed during the reaction. Poly(oxy-2,6-dimethyl-l,4-phenylene), poly(l,4-phenylene sulfide) and poly(l,4-phenylene) are examples of this type of reaction. The formation of radical ions in these reactions is discussed and they are compared to Bunnett's SRN1-reactions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.020121985110
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  • 6
    Electronic Resource
    Electronic Resource
    Die Bildung von L-3-Acylamino-6,7-dihydroxy-hydrocumarinen aus N-Acyl-3-(3,4-dihydroxyphenyl)-L-alaninenHerrn Dr. O. Isler zum 60. Geburtstag gewidmet (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1708-1712 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den N-Acyl-3-(3,4-dihydroxyphenyl)-L-alaninen 1a, 1b und 1c entstehen bei der Oxydation unter anderm die L-3-Acylamino-6,7-dihydroxy-hydrocumarine 2a, 2b und 2c. Diese Reaktion stellt einen präparativ brauchbaren Weg zur Synthese von 3-(2,4,5-Tri-hydroxyphenyl)-L-alanin (6-Hydroxy-L-DOPA, 3) aus 3-(3,4-Dihydroxyphenyl)-L-alanin dar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530719
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  • 7
    Electronic Resource
    Electronic Resource
    Experimentelle Beiträge zum MILLS-NIXON-Effekt I: Magnetische Kernresonanzspektren von 5-Hydroxyindan und 6-Hydroxytetralin 17. Mitteilung zur Kenntnis der Azokupplungsreaktion [1] (1965)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 48 (1965), S. 1791-1795 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 5-hydroxyindane and 6-hydroxytetralin and their respective anions have been investigated by proton magnetic resonance spectroscopy. The results indicate that by forming the anion of 5-hydroxyindane, the increase of electron density is the greatest at position 6, in agreement with its abnormal reactivity (Mills-Nixon effect [2]).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19650480738
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  • 8
    Electronic Resource
    Electronic Resource
    Versuche zur Synthese von 9β, 10α-Steroiden; B,C,D-tricyclische VerbindungenHerrn Dr. O. Isler zum 60. Geburtstag gewidmet (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 964-973 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a search for a new and efficient synthesis of the compound 7, the cyclization of 5 (obtained by a Michael-reaction from 3 and 4) was studied. Treatment of 5 with strong acid furnished the known dienedione 8. Mild acidic conditions gave the bridged alcohol 9 and other, unidentified products, rather than the desired enone 6. Under basic conditions, 5 did not cyclize to 6, but underwent retro-Michael reaction. Attempts were then made to convert the dienedione 8 to the 14α-enone 19. However, both catalytic hydrogenation and lithium-ammonia reduction of 8 yielded mainly 14β-products. In some hydrogenation experiments, isomerization of the dienedione 8 to the phenols 13 (major) and 14 (minor) occurred. The stereochemistry of the new isomeric des-A-androst-9-en-5, 17-diones (16, 17 and 20) was determined by chemical and spectroscopic methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530512
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  • 9
    Electronic Resource
    Electronic Resource
    Eine Synthese O,O-di- und N-mono-acylierter L-CyclodopaderivateHerrn Dr. O. Isler zum 60. Geburtstag gewidmet (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1704-1708 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Am Beispiel der Synthese von O,O-Diacetyl-L-cyclodopa-methylester (12) wird eine allgemein anwendbare Methode zur selektiven Acylierung der phenolischen Hydroxylgruppen oder des Indolin-Stickstoffs am Cyclodopa (8) beschrieben. Die Verwendung von L-DOPA (5) als Ausgangsmaterial für die Cyclisierung erlaubt die Darstellung grösserer Mengen solcher Derivate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530718
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  • 10
    Electronic Resource
    Electronic Resource
    NMR.-Spektren von Zwischenprodukten elektrophiler aromatischer Substitutionen und Elektronen-Donator-Acceptor-Komplexen (1965)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 48 (1965), S. 554-563 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1) The structure of the intermediates (σ-complexes) in two bromination reactions have been studied by proton magnetic resonance spectroscopy. The structures correspond to those earlier described in the bromination of 2-naphthol-6,8-disulphonic acid [1].
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19650480313
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