Isomere Diamino-alkoxy-pyridin-carbonitrile — ihre Trennung und Verwendung als Kupplungskomponenten |
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Authors: | Hans Junek Georg Uray Anna Kotzent |
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Affiliation: | 1. Institut für Organische Chemie, Abteilung für Angewandte Organische Chemie, Karl-Franzens-Universit?t, A-8010, Graz
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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. |
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