A novel synthesis of 1‐oxo‐thieno[3’,2’‐3,4] pyrazolo[1,2‐a] pyrazole azo dye systems for dyeing of synthetic and modified cellulose fibers

Abstract

A new series of the title pyrazole azo dye systems has been synthesized. The new dyes are applied on nylon and cellulose acetate fibers to give dyed fabrics with excellent properties of colour intensity and fastness properties. The physical and spectral data of the investigated dyes are illustrated. The shifts of ultraviolet‐visible absorption maxima affected by the structural configuration of the pyrazole dye systems are investigated. The structural effects of the polyfunctionally substituted pyrazole dye systems on the intensity of colour and fastness properties of the dyed fabrics are discussed. The data of these studies are listed. The colour shades of the synthesized dyes on nylon and acetate fabrics are indicated.

Novel synthesis of pyran, thiophene, and pyridine derivatives incorporating thiazole ring and their antitumor evaluation

“…In the current work, we are explaining the synthesis of thiazole derivatives together with their antitumor evaluation, in proceedings to our concern in synthesize of bioactive heterocyclic compounds. Thus, compound ( 1 ) 2‐(4‐oxo‐4,5‐dihydrothiazol‐2‐yl)acetonitrile, which was obtained as reported in literature by the reaction of malononitrile with thioglycolloic acid in acetic acid solution, reacted with any of acetphenone, 4‐chloroacetophenone, or 4‐methylacetophenone in an oil bath at 120°C to afford the respective compounds 2a‐c through the Knoevenagel reaction (Scheme ).…”

New disazo dyes derived from aminopyrazoles: synthesis, spectroscopic properties, computational study and structural properties

“…Constituting a group of widely used organic compounds, 1‐3 azo dyes are of great interest due to their various applications in the fields of chemical science and technology. The most commonly used colourants among textile dyes are the azo dyes because of their characteristic properties of dyeing strength, easy production, wide colour scales and good quality colour fastness 4‐13 . Azo dyes are also used as solar cells, 14 photo‐sensitisers, 15 sensors, 16 photochromic materials, 17 metallochromic indicators 18 and electro‐optic devices 19 .…”

Synthesis and application of bifunctional reactive dyes pyrazolo[1,2‐a] pyrazole 3‐carboxylic acid

“…We have previously reported the synthesis of some novel fused pyrazolopyrazole azo disperse dyes for dyeing nylon and acetate fabrics with different bright colours and good fastness properties (Shams et al , 2001a, b, c). Also, we have synthesised new disazo reactive dyes derived from pyrazolopyrazole and their dyeing properties on cotton and wool fabrics have been evaluated (Youssef et al , 2006).…”