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The 3-amino-2-cyano-4,6-dimethyl-thieno [2,3-b]pyridine was diazotised and coupled with a variety of compounds to give a seri- es of novel thieno[2,3-b]pyridine azo dyes. The structure of these dyes were confirmed by IR, Mass and 1H-NMR spectra. These dyes were applied to polyester, polyamide and wool fabrics, and show yellow to red hues. Dyeings on polyester fabrics were deeper than those on polyamide and wool fabrics. The sublimation fastness of these dyes on polyester fabrics range was 3-4 ∼ 5 grade. The washing fastness of these dyes on polyamide fabrics was higer than those on wool fabrics, and range was 3 ∼ 5 grade. The lightfastness of these dyes on polyester , polyamide and wool fabrics range was 2 ∼ 4 grade.
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