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  • (S,S)-(−)-1,2-Diamino-1,2-diphenylethane  (1)
  • Diamino-alkoxy-pyridine-carbonitriles  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 114 (1983), S. 973-982 
    ISSN: 1434-4475
    Keywords: Azo Dyes ; Diamino-alkoxy-pyridine-carbonitriles ; UV-VIS spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The isomeric 4,6-diamino-2-alkoxy- (3), and 2,4-diamino-6-alkoxy-3-pyridine-carbonitriles (4) are obtained by treatment of 2-amino-1,1,3-tricyanopropene (1) with sodium alkoxides. Separation is based on their differentpK a -values (3 a=2.01,4 a=4.17). Coupling reaction of3 a-c with benzenediazonium chloride in strong acidic medium leads to the yellow azo dyes5 a-c, whereas coupling of4 a requires a buffered solution (pH 4–6) to yield6. The UV-VIS spectra of the isomer pyridines and the azo dyes are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 121 (1990), S. 1039-1043 
    ISSN: 1434-4475
    Keywords: (S,S)-(−)-1,2-Diphenylethylenediamine ; (S,S)-(−)-1,2-Diamino-1,2-diphenylethane ; Absolute configuration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde die Kristallstruktur von (−)-Diphenylethandiammonium-(R,R)-tartrat bestimmt. Aus dieser Strukturbestimmung ergab sich die Zuordnung der (S,S)-Konfiguration zum (−)-Diphenylethandiamin. Die asymmetrische Einheit der Kristallstruktur besteht aus zwei Formeleinheiten der Titelverbindung sowie einem Molekül Ethanol und einem Wassermolekül, welche ein komplexes Netzwerk von insgesamt 19 Wasserstoffbrücken bilden.
    Notes: Summary The crystal structure of (−)-diphenylethanediammonium-(R,R)-tartrate was determined. From this structure determination, the (S,S) configuration was assigned to the (−)-diphenylethanediamine. The asymmetric unit of the crystal structure contains two units of the title compound plus one molecule of ethanol and one water molecule, which form an intricate network of 19 hydrogen bonds.
    Type of Medium: Electronic Resource
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