F. Karcı, A. Demirçalı
2006
Citations
1
Influential Citations
39
Citations
Journal
Dyes and Pigments
Abstract
Abstract The reaction of 2-aminobenzimidazole with ethyl cyanoacetate gave access to an efficient synthesis of 4-amino-1 H -benzo[4,5]imidazo[1,2- a ]pyrimidin-2-one ( I ) in excellent yield. A series of novel phenylazopyrimidone dyes were prepared by linking o -, m -, p -nitroaniline, o -, m -, p -chloroaniline, o -, m -, p -anisidine, o -, m -, p -toluidine and aniline to 4-amino-1 H -benzo[4,5]imidazo-[1,2- a ]pyrimidin-2-one ( I ). The prepared compounds were characterized by UV–vis, FT-IR and 1 H NMR spectroscopic techniques and elemental analysis. The effect of varying pH and solvent upon the absorption ability of phenylazopyrimidones substituted with electron-withdrawing and electron-donating groups at their o -, m -, p -position was examined.