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  • Organic Chemistry  (3)
  • critical currents  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Doped Tl-1223 Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 107-108 
    Details
    ISSN: 1572-9605
    Keywords: Tl-superconductors ; preparation ; critical currents ; texturing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Doped Tl-1223 superconductors of the composition TlaBibPbcBanSr2−nCa2Cu3Oy (a = 0.50 − 0.76, b = 0, 0.16 and 0.3, c = 0.5, 0.24 and 0, n = 0.15 − 0.4) were prepared from oxidic Ba-Sr-Ca-Cu precursor material. Upon calcination of the tartrate gels or the nitrates, the respective amounts of Tl2O3, PbO and Bi2O3 were added to the oxidic powders by milling. The samples were sintered in silver foil. The specimens consisted predominantely of the Tl-1223 phase with small amounts of Tl-1212 and secondary phases. Tc(0)-values ranged between 115 K and 119 K with transition widths around 1 K. Transport critical current densities up to 1.4 kA cm−2 at 77 K were measured for the assintered samples. Texturing was obtained by repressing and resintering of the superconducting material followed by annealing at 750°C for 50 h in flowing oxygen. The transport critical current densities could be improved up to 7 kA cm−2 by the thermomechanical treatment. Microstructural studies yielded information on the alignment of the superconducting grains, on secondary phases and the porosities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022662703194
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  • 2
    Electronic Resource
    Electronic Resource
    Saure Abspaltung der S-Tritylgruppe am Beispiel synthetischer Insulinfragmente (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 227-247 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Acidic Removal of S-Trityl Groups as Demonstrated for Synthetic Insulin FragmentsHerrn Prof. Schultheis zum 75. Geburtstag gewidmet.Deprotection of S-trityl peptides in acid solution has been investigated. Oxidation with iodine in aqueous acetic acid proved to be an advantageous approach, yielding cystine derivatives, Cysteine-containing peptides have been synthesised by treatment of S-trityl peptides with trifluoro-tic acid/ethanethiol (1:1).-The synthesis of several fragments of the A-chair. of insulin is described.
    Notes: Die Abspaltung der S-Tritylgruppe von Peptiden in saurem Medium wurde untersucht. Günstig erwies sich die Oxidation mit Iod in wäßriger Essigsäure, wobei Cystinderivate entstehen und die Deblockierung in Trifluoressigsäure/Ethanthiol (1:1), die Cysteinverbindungen liefert.-Die Synthese von mehreren Insulin-A-Kette-Fragmenten wird beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790211
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  • 3
    Electronic Resource
    Electronic Resource
    Eine neue Synthese des Antamanids (1969)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 727 (1969), S. 125-129 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Novel Synthesis of AntamanidBy cyclization of the linear decapeptide phenylalanyl-phenylalanyl-prolyl -prolyl-phenyl-alanyl-phenylalanyl-valyl-prolyl-prolyl-alanine (position 5 → 4 in formula 1,) with the help of dicyclohexylcarbodiimide/N-hydroxy-succinimide (DCC/HOSu) antamanid (1,) is obtained in a 36.5% yield.
    Notes: Durch Ringschluß des linearen Decapeptids Phe-Phe-Pro-Pro-Phe-Phe-Val-Pro-Pro-Ala (Stellung 5 → 4 in Formel 1) mittels Dicyclohexylcarbodiimid/N-Hydroxy-succinimid wird das cyclische Decapeptid Antamanid in 36.5 proz. Ausbeute erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19697270115
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of Segments of the GnRH-Associated Peptide (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1055-1061 
    Details
    ISSN: 0170-2041
    Keywords: Gonadoliberin-releasing hormone ; Peptides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 56 amino acid containing GnRH-associated peptide (GAP) may be prepared by a combination of fragment condensation and solid-phase peptide synthesis (SPPS). The solution-phase synthesis of the fragments 1-9 is described. Furthermore, we report on the selective cleavage of benzyl esters by catalytic hydrogenation in the presence of the 9-fluorenylmethyloxycarbonyl (Fmoc) protecting group. The C-terminal 15 amino acid containing fragment of GAP (10) was synthesized by SPPS.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1992199201174
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