Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10266569 | Dyes and Pigments | 2005 | 8 Pages |
Abstract
The 3-amino-4,6-disubstituted-thieno[2,3-b]pyridines were diazotized and coupled with 3-aminocrotononitrile to give the 3-(2-hydrozone-3-ketimino-butyronitrile)-4,6-disubstituted-thieno[2,3-b]pyridines which can react with 85% excess hydrazine hydrate to afford the corresponding 3-(5-amino-3-methyl-pyrazol-4-yl)-azo-4,6-disubstituted-thieno[2,3-b]pyridines. The 3-(2-methyl-5,7-disubstituted-pyrazolo[1,5-a]pyrimidine-3-yl)azo-4,6-disubstituted-thieno[2,3-b]pyridine dyes were obtained by the cyclocondensation reaction of 3-(5-amino-3-methyl-pyrazol-4-yl)-azo-4,6-disubstituted-thieno[2,3-b]pyridines with the appropriate 1,3-diketones under acidic condition. The dyes were applied to polyester fibers and their spectral characteristics and fastness properties measured.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yuh Wen Ho,