Monatshefte für Chemie/Chemical Monthly

Isomere Diamino-alkoxy-pyridin-carbonitrile—ihre Trennung und Verwendung als Kupplungskomponenten

H Junek, G Uray, A Kotzent

Index: Junek, Hans; Uray, Georg; Kotzent, Anna Monatshefte fuer Chemie, 1983 , vol. 114, p. 973 - 982

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Citation Number: 7

Abstract

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 different pK a-values (3 a= 2.01, 4 a= 4.17). Coupling reaction of 3 ac with benzenediazonium chloride in strong acidic medium leads to the yellow azo dyes 5 ac, whereas coupling of 4 a requires a buffered solution (pH 4–6) to ...