57770-59-9Relevant academic research and scientific papers
Novel heterocyclic disazo dyes containing pyrazole and phenylpyrazole. part 1: Synthesis, characterization, solvent polarity and acid-base sensitive characteristics
Demir?al?, Aykut
, (2021)
A series of diazotised aniline and aniline derivative compounds were reacted with solution of malononitrile in pyridine at 0–5 °C were obtained 1a-1m compounds. Then 4-arylazo-3,5-diamino-1H-pyrazole (2a-2m) derivatives were synthesized by coupling arylazo malononitrile compounds with hydrazine. Finally, the synthesized pyrazole derivative 2a-2m compounds were again diazotised. By reacting these diazotised compounds with 3-amino-5?hydroxy-1-phenylpyrazole, the new thirteen heterocyclic disazo dyes (3a-3m) were joined the dye literature and the dye industry. The structures of these newly synthesized compounds were characterized using elemental analysis and spectroscopic methods such as Fourier transform infrared spectroscopy-Attenuated total reflectance (FT-IR-ATR), 1H-Nuclear magnetic resonance (1H NMR) spectroscopy and mass spectroscopy. Then solvatochromic properties and solvent effect in dimethyl sulfoxide, dimethyl formamide, acetonitrile, acetic acid, methanol and chloroform were investigated. In addition, the effects of organic and inorganic acids and bases on the absorption spectra of the compounds and the substituent effect of the phenyl ring-bound groups were investigated.
DFT, FT-IR, FT-Raman and NMR studies of 4-(substituted phenylazo)-3,5- diacetamido-1H-pyrazoles
Kinali, Selin,Demirci, Serkan,?ali?ir, Zühre,Kurt, Mustafa,Ata, Ahmet
, p. 254 - 258 (2011/06/27)
We present a detailed analysis of the structural and vibrational spectra of some novel azo dyes. 2-(Substituted phenylazo)malononitriles were synthesized by the coupling reaction of the diazonium salts, which were prepared with the use of various aniline
Reactions with heterocyclic amidines: Synthesis of pyrazolo[3,4-e]thiazepine, pyrazolo[1,5-c] 1,2,4-triazine and pyrazolo[1,5-a]pyrimidine derivatives
Sofan,El-Taweel,Abu El-Maati,El-Agamey
, p. 482 - 486 (2007/10/02)
5-Aminopyrazoles 1 condensed with aromatic aldehydes in C2H5OH/piperidine to afford the arylidenes 3a-e. Compounds 3 reacted with mercaptoacetic acid to give the pyrazolo[3,4-e] 1,4-thiazepines 5a, d. Diazotized aminopyrazole 1a coupled with acetoacetanilide to afford the parazolo[1,5-c] 1,2,4-triazine 6. Reaction of 1a with the ylidenes 7a-d afforded 13a-c and 16, respectively. Also, condensation of 18 with ethyl acetoacetate, acetoacetanilide, ethyl α-methylacetoacetate and diethyl acetonedicarboxylate resulted in the formation of the pyrazolopyrimidines 22a-c.
