Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: A. C. Razus, L. Birzan, S. Nae, L. Cristian and F. Chiraleu
Editorial: Dyes and Pigments, 57, p.223-33, 2003.
The coupling between diazonium salts obtained from the three aminopyridine 1-oxides and azulene allowed the synthesis in good yield of the corresponding azulene-1-azopyridine 1′-oxides, which were characterised. The reduction and the methylation of the products were studied. The last two reactions allowed to synthesize azulene-1-azo-2′-pyridine and its alkylpyridinium salts, unavailable on other way. The UV-vis spectra of azulene-1-azopyridines were compared with those of the corresponding N-oxides and pyridinium salys. For the N-oxides the solvatochromic effect was evidenced.
Cuvinte cheie: azulene, diazene, pyridine-N-oxides, dyes