A facile syntheses and absorption characteristics of some monoazo dyes in bis-heterocyclic aromatic systems part I

Gewald reaction: synthesis, properties and applications of substituted 2-aminothiophenes

“…[169][170][171][172] The 2-aminothiophene based azo dyes are known as dispersed dyes with excellent brightness shade of shade. This class of dyes was established as an alternative to more expensive anthraquinone dyes.…”

Dyeing Behavior and Performance of Prepared Benzimidazole and Chromene Disperse Dyes as Applied on Polyester Fibre, and Its Blends With Wool.

“…A range of bright and leveled shade have been obtained on application of these dyes to polyester, polyester woolen type and wool fibre (12) .…”

Synthesis and Spectral Characteristics of Disazo Dyes Containing Heterocyclic Diazo Components

“…In contrast, dye 7 derived from 2-amino-6-nitrobenzothiazole diazo moiety showed a hypsochromic shift compared to that of corresponding dye 5 which was 28 nm. In this case, the diene effect arisen by a 5-membered heterocyclic ring, such as thiophenes and thiazoles, could be mainly contributed to the red shift observed [14][15][16][17][18]. Therefore, all disazo dyes prepared could afford blue to greenish-blue shades, irrespective of heterocyclic diazo component.…”