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  • Organic Chemistry  (3)
  • Wiley-Blackwell  (3)
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  • Wiley-Blackwell  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 848-856 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Physico-chemical Analysis of the Hydrolysis of N-(2-Cyanethylene-)ureaBy means of pulse-polarography, infrared and n.m.r.-spectroscopy and electronattachment-mass-spectroscopy the hydrolysis of N-(2-cyanethylene-)urea (BA 1) under relatively mild conditions has been evidenced (pH 5,6 to 9.0; T = 37° C and 22° C). With rising pH value the rate of hydrolysis increases. At pH 5.6 the hydrolysis is very slow (half life time ca. 6 days), but condensation products are already demonstrable. At pH 9.0 nearly all of BA 1 molecules are hydrolysed within 2 days under splitting of the heterocycle and formation of various hydrolysis products. On the middle pH range from 7.3 to 8.3 the formation of 2-cyanaziridine was followed and after cycle splitting various resultant products were observed. The half life time of BA 1 hydrolysis at pH 7.3 and T = 37° C has been determined to 103 ± 1 hours (0.144 m BA 1, phosphate buffer).
    Notes: Mit Pulspolarographie, Infrarot- und NMR-Spektroskopie sowie Elektronenanlagerungs-Massenspektrographie wurde die Hydrolyse von N-(2-Cyanäthylen-)harnstoff (BA 1) unter noch relativ milden Bedingungen (pH 5,6 bis 9,0; T = 37°C und 22°C) nachgewiesen. Die Hydrolysegeschwindigkeit nimmt mit steigendem pH-Wert zu. Bei pH 5,6 erfolgt die Hydrolyse sehr langsam (Halbwertszeit etwa 6 Tage), wobei auch schon Kondensationsprodukte nachweisbar sind. Bei pH 9,0 ist bereits nach 2 Tagen BA 1 unter Ringspaltung weitgehend hydrolysiert, und eine Reihe Kondensationsprodukte sind entstanden. Im mittleren pH-Bereich von 7,3 bis 8,3 wurde das Auftreten von 2-Cyanaziridin, aber auch schon Ringspaltung und hydrolytische Folgeprodukte beobachtet. Die Halbwertszeit der BA 1-Hydrolyse konnte bei pH 7,3, 37°C für eine 0,144 molare Lösung in Phosphatpuffer zu 103 ± 1 h bestimmt werden.
    Additional Material: 6 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 319 (1977), S. 522-525 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polarographic Differentiation between 6-Azalumazines and 1,2,4-Triazines
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 270-278 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polarographic Reduction of β-Aminovinylimines of the Indene SeriesThe mechanism of electrolytic reduction of aminovinylimine (AVI) is suggested, based on results of the identification of electrolysis products and on the dependence of polarographic curves. It is shown that this mechanism becomes complicated by the kinetics of hydrolysis of starting substances and intermediates. The determination of complex forming constants for AVI and bovine serum albumine is determined and compared by polarography and spectroscopy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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