3722-14-3Relevant 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
, (2021/02/02)
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.
Mechanically activated solid-state synthesis of phenylhydrazone derivatives via high-speed ball milling
Zhu, Xingyi,Chen, Yuanyuan,Chen, Yuhe,Wang, Jue,Su, Weike
, p. 621 - 626 (2014/07/21)
A series of phenylhydrazone derivatives was synthesized from arenediazonium tetrafluoroborates and active methylene compounds under high-speed ball milling. The reaction occurred in the absence of the solvent and products were obtained in good yield within short reaction times (no more than 30 min).
On the chemistry of cinnoline I. synthesis and reactions of (4-Amino-cinnolin-3-yl)-p-tolyl-methanones
Amer, Atef M.,El-Bermaui, Mohamed A.,Ahmed, Ahmed F. S.,Soliman, Somya M.
, p. 1409 - 1418 (2007/10/03)
The synthesis of a series of (4-Amino-cinnolin-3-yl)-p-tolyl-methanones from aryl-hydrazonomalononitrile in a one step procedure is reported. The (4-amino-cinnolin-3-yl)-p-tolyl-methanones could be annelated to the corresponding 1,2-dihydro-4-(p-tolyl)-2-oxopyrido[3,2-c]cinnoline derivatives via (4-acetamido-cinnolin-3-yl)-p-tolyl-methanones. Treatment of 1,2-dihydro-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline-2-one with POCl1 and P2S5 gave 2-chloro-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline and 1,2-dihydro-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline-2-thione. Treatment of the ketone with malononitrile afforded 2-amino-3-cyano-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline. Using these ketones, a facile and convenient route towards substituted pyrimidino[5,4-c]-cinnolines was developed. Chemical and spectroscopic evidences for the structures of the new compounds are presented.
