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  • Chemistry  (18)
  • Organic Chemistry  (8)
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • 11
    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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  • 12
    Electronic Resource
    Electronic Resource
    Sekundäre Isotopeneffekte der Aciditätskonstanten kerndeuterierter Anilinium-Ionen (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1184-1190 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1) Acidity constants of 2,3,4,5,6-d5-, 2,4,6-d3- and 3,5-d2-anilinium ion, of 2,6-d2-4-toluidinium and 4-d-2,6-xylidiniumion have been measured in aqueous solution.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460414
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  • 13
    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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  • 14
    Electronic Resource
    Electronic Resource
    Sodium activity measurements in protein solutions with sodium amalgam electrodesCertain commercial equipment, instruments, or materials are identified in this article to specify adequately the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose. (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 125-129 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method using sodium amalgam electrodes has been developed to study the effect of protein on activity measurements and residual liquid junction potential of sodium in protein-containing solutions. It was tested for reliability by application to aqueous sodium chloride solutions before it was applied to protein-containing solutions. The experimentally determined activity coefficients are in good agreement with the activity coefficients for aqueous sodium chloride solutions reported in literature. Therefore, we used this method to measure the activity of NaCl solutions containing varying concentrations of bovine serum albumin (BSA). The electrode slope of the electrode responses in a protein-containing medium does not differ from that of pure aqueous solutions. A functional relationship has been established between the concentration of protein and the percent bias in the measurements. Measurements of electromotive force made in protein-containing solutions do not show any evidence of protein effect on liquid junction potential.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030209
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  • 15
    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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  • 16
    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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  • 17
    Electronic Resource
    Electronic Resource
    Spektrochemische Untersuchungen zur Mikroanalyse des Stahlgefüges (1956)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 296-302 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Spektralanalytisch sind in isolierten Gefügebestandteilen des Stahls noch Spuren erfaßbar, die mikroanalytisch nicht bestimmt werden können. Spektralunempfindliche Elemente müssen zusätzlich mikroanalytisch erfaßt werden. Die sehr stark wechselnde Zusammensetzung der isolierten Teilchen erforderte ein leitprobenfreies spektralanalytisches Verfahren. Analysenmethoden für Einwaagen von 0,05 mg Substanz und eine dazugehörige Mikromanipulation wurden ausgearbeitet. Der Zeitaufwand ist gegenüber der Mikroanalyse gering. Die Verfahren sind nicht auf Stahl beschränkt, sondern können für viele analytische Arbeiten nützlich sein.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19560680807
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  • 18
    Electronic Resource
    Electronic Resource
    Mikroanalytische Aufgaben in Metallkunde und Metallurgie (1952)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 64 (1952), S. 187-195 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Microanalytical Problems in Metallography and MetallurgyMicroanalysis has become increasingly important in metallographic analyses during recent years. This paper shows the particular problems with reference to the investigation of the structure of iron and steel. It has been possible to determine important new information concerning carbide and oxide occlusions, as well as those of nitrides, sulphides and intermetallic compounds. Particular attention is paid to the problems arising in taking the samples.
    Notes: Die Mikroanalyse hat in den letzten Jahren für die metallkundliche Analyse sehr an Bedeutung gewonnen. Es wird hier gezeigt, welche Aufgaben ihr besonders bei der Gefügeforschung an Stahl und Eisen gestellt werden. Es ist gelungen, wesentliche neue Erkenntnisse über Carbide und oxydische Einschlüsse und solche von Nitriden, Sulfiden und intermetallischen Verbindungen zu erhalten. Besondere Sorgfalt wird den bei den Probenahmen auftretenden Problemen gewidmet.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19520640704
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  • 19
    Electronic Resource
    Electronic Resource
    Über den Aufbau von β-Dekalon aus Cyclohexanon (1937)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 70 (1937), S. 355-359 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19370700233
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