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    Electronic Resource
    Electronic Resource
    Isomere Diamino-alkoxy-pyridin-carbonitrile — ihre Trennung und Verwendung als Kupplungskomponenten (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 973-982 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00799957
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