Synthesis of some novel heterocyclic dyes derived from pyrazole derivatives

Synthesis and characterization of metal complexes of azo dye based on 5‐nitro‐8‐hydroxyquinoline and their applications in dyeing polyester fabrics

“…Total dyeing time was 90 min. It was then cooled to 60 °C and then after washing, dyed samples were rinsed and dried …”

An Eco-Friendly Synthesis of Heterocyclic Moieties Condensed with Pyrazole System under Green Conditions and Their Biological Activity

“…The infrared spectra were recorded on Perkin-Elmer FTIR 1430 spectrophotometer using the KBr disk technique. The 1 H NMR and 13 C NMR spectra were recorded on a Bruker AC spectrometer (300 MHz) at 25˚C in DMSO-d 6 with TMS as internal standard and chemical shifts are reported in ppm as δ values. Reactions were conducted under microwave irradiation in closed vessels under magnetic stirring in a Synthos 3000 (Anton Paar) microwave with dual magnetrons system and with maximum power of 1000 W. Mass spectra were measured on a Finnigan MAT 8222 EX mass spectrometer at 70 eV.…”

“…2) Method B: To a solution of 1-phenyl-3-pyridyl-5-pyrazolone 1 (4.74 g, 20 mmole) and acetonitrile (20 ml) add a solution of NBSc (N-bromo sacharrine) (5.2 g, 20 mmole) in acetonitrile (10 ml) dropwise at room temperature with stirring for 4 h. The formed precipitate was filtrated; washed with chloroform, dried and crystallized from ethanol to give compound 2, (87% yield) with same melting and mixed m.p. IR (KBr) υ/cm −1 = 2980 (CH aliph ), 1658 (C=O), 1558 (C=N), 748 (C-Br); 1 H NMR (DMSO): δ ppm = 7 -7.64 (m, 5H, ph-H), 7.66 -8.83 (m, 4H, H-pyridine); 13 C NMR (DMSO): δ ppm = 49 (C 4 pyridine), 120 -132 (Ar-C), 124 -152 (py-C), 155 (C 4 pyridine), 160 (C=O); Anal. Cald.…”

“…Fused pyrazoles have fungicidal [6], herbicidal [7], veridical [8] and insecticidal activity [9] [10] and have been used for the treatment of rheumatoid arthritis [11] [12]. Beside the pharmaceutical importance pyrazoles are very important class of heterocycles due to their commercial uses in dyestuffs and food coloring agents [13].…”

A solvent induced crystallisation method to imbue bioactive ingredients of neem oil into the compact structure of poly (ethylene terephthalate) polyester

“…Several attempts for creating suitable functional groups in PET substrates were made in the past [23,24]. Most recently, novel pyrazolotriazine and pyrazolylpyrazoloneazo dyes have been synthesized and were applied to polyester by using a disperse dyeing technique, which is commonly used for dyeing polyester, to study the antibacterial activity of the above azo dyes [25]. Subsequently, different approaches have been used by researchers to impart antimicrobial activity to the polyester based textile materials [26][27][28][29][30].…”