ISSN:
1434-4475
Keywords:
4,6-Diamino-2(1H)-pyridone-3-carbonitrile
;
2,4-Diamino-6(1H)-pyridone-3-carbonitrile
;
Bromination and iodination
;
Azo-dyes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Ether cleavage of the two isomeric diamino-methoxy-pyridine-carbonitriles1 and2 leads to the isomeric 4,6-diamino-2(1H)-pyridone-3-carbonitrile (3 a) and 2,4-diamino-6(1H)-pyridone-3-carbonitrile (4 a), resp. Dependent on the reaction conditions in glacial acetic acid containing hydrogen bromide or potassium iodide the halogenated pyridones (3 b, 4 b–c) can be obtained.pK s -values and UV-spectra of the pyridones are discussed.3 a and4 a can be used as azo-coupling components, yielding the azo-dyes5 and6. Similarly 4-amino-6-hydroxy-2(1H)-pyridones (7 a–b) are coupled with several aryl- and heteroaryl-diazoniumsalts to form the azo-dyes8 a–g.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00811253
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